Electrostatic precipitator drawing approval is the step between the signed proforma invoice and the start of production: the supplier issues a general arrangement drawing of the offered configuration, and the buyer signs it or returns it. Eleven lines on that drawing decide whether the unit reaches the duct, can be opened and connected, and matches the order paid for.
The expensive error at this step is a signature given on the strength of the outline. The drawing looks like the unit, the airflow is right, the model number matches, and it is approved. What was not read is the side the cells withdraw from, drawn against the wall; the flange holes, drawn to the catalog pattern rather than the duct; the three module weights, drawn without a support; the supply, drawn as the brochure default. Each of those is visible on the drawing before anything is built, and each one costs a rebuild, an adapter or a crane visit when it is found on delivery day instead.
This page helps you decide whether the general arrangement drawing in front of you can be signed, which of its eleven lines to check against which document or site measurement, what to return when a line is missing or different, and what to ask in writing before a change is made after approval. It gives an eleven-point sheet, works one three-stage train through a plant room, gives a five-line return email, and says how our own drawings are issued and what to ask for on them. It does not size the unit, design the duct or replace the approval of whoever reviews your installation. For the datasheet the drawing is drawn from, see our electrostatic precipitator datasheet page; for whether a three-stage train fits the plant room at all, which is settled before the drawing is ordered, see ecology unit installation.
| Question | Our answer |
|---|---|
| What the drawing is | The supplier’s overview drawing of the configuration offered: the modules, their envelope, flanges, service side, supports and electrical entry, drawn in plan and elevation from the per-model datasheet figures |
| Where it sits in the order | After the proforma invoice is signed and before production is released; on our orders, between step 2 (quotation) and step 4 (production, 7 to 15 days for standard models) |
| Who signs it | The buyer or the contractor and consultant acting for the buyer, against the site, the duct and the panel; the supplier draws, the buyer approves |
| The sheet | The 11-Point ESP Drawing Approval Sheet: what the drawing must show, what you compare it with, and what to return when a line is missing or different |
| The three lines to check before any other | The service side and the clearance in front of it; the flange hole pattern against the duct; the supply, drawn as the brochure default instead of the panel reading |
| Our own drawings | Issued on request for the offered configuration, drawn from the published per-model dimensions, flanges and weights, and kept confidential under NDA; we need the duct section, the service side, the straight run and the panel reading to draw them |
| Not on this page | Model selection, the fit of a train in a plant room, replacement measurements, the duct’s own construction and access openings, pre-shipment inspection; each has its own page |
- Where the drawing sits: after the proforma invoice, before production
- The 11-Point ESP Drawing Approval Sheet
- Envelope, flange and transitions: the lines that decide whether it reaches the duct
- Service side, supports and supply: the lines that decide whether it can be used
- Signing off: revision, model list, and what a change afterwards means
- Our own drawings, against the sheet
- Scope and limits
- Buyer record and key takeaways
- Frequently asked questions
Where the drawing sits: after the proforma invoice, before production
A general arrangement drawing for an electrostatic precipitator order is the supplier’s overview drawing of the offered configuration, issued after the proforma invoice and signed before production is released. It shows the modules in plan and elevation, with the envelope, the flanges, the service side, the supports and the electrical entry drawn to dimension; an isometric view, where one is given, is for orientation and is not read for dimensions. The drawing is drawn from the per-model figures on the datasheet, so it cannot say anything the datasheet does not know, but it can say the one thing the datasheet cannot: how those figures sit in your duct run.
On our orders the step falls between quotation and production. Our supplier profile sets out five steps: the enquiry, the quotation with its proforma invoice, datasheet and certificate copies, the sample order at a minimum of one unit, production in 7 to 15 days for standard models with every unit inspected before packing, and shipping. The drawing is the hinge between the second and the fourth. Our enquiry sheet says that finished drawings are not needed before an enquiry, and that a general arrangement drawing for the offered configuration follows on request; our quotation comparison page ends its worked example with the instruction to have that drawing checked against the site before the deposit. This page is what that check consists of.
| Step | What the supplier issues | What the buyer holds it against | What is fixed when it is done |
|---|---|---|---|
| Enquiry | Nothing yet; the ten inputs go out | The site: airflow, position, service side, panel reading, port | What is being quoted |
| Quotation | Proforma invoice, datasheet for the quoted models, certificate copies | The datasheet reading sheet; the quotation comparison sheet | Models, stages, terms, price |
| Drawing | General arrangement drawing of the configuration | The eleven lines below: the duct, the plant room, the panel, the proforma invoice | Orientation, service side, flanges, supports, supply, scope of supply |
| Production | The units, built to the signed drawing and proforma invoice | The pre-shipment checklist before the balance is paid | What ships |
| Delivery | Shipping documents | The arrival record | What was received |
Who signs depends on who owns the interfaces. The duct belongs to the ventilation contractor, the panel to the electrical contractor, the plant room to the building, and the order to the buyer; the drawing crosses all four, and the signature is only worth having from someone who has checked the lines that touch each. In practice that is the contractor or consultant acting for the buyer, with the buyer signing on their check. The supplier draws and does not approve its own drawing.
The 11-Point ESP Drawing Approval Sheet
Electrostatic precipitator drawing approval is done line by line against a document or a measurement, not by looking at the drawing as a whole. The sheet below has one row per line. The second column says what the drawing must show for the line to be checked at all. The third says what you compare it with: a measurement taken on site, a reading at the panel, or a line of the proforma invoice or datasheet. The fourth says what to return when the line is missing or does not match. A line that cannot be checked because the drawing does not show it is returned, not assumed. What the proforma invoice itself has to carry before the deposit, line by line, is on our electrostatic precipitator proforma invoice page.
A drawing that shows all eleven lines, each matching its document or measurement, is signed as a numbered revision. A drawing with a missing or mismatched line is returned with the line number, the measured value and the change required; it is not signed with a note in the margin.
The 11-Point ESP Drawing Approval Sheet (our own working sheet, not a drawing standard)
| # | Line | The drawing must show | Check against | If missing, or different |
|---|---|---|---|---|
| 1 | Models and unit count | Every module by model number, the number of units, and how they are arranged (one per duct, units in parallel, stages in a train) | The model list on the signed proforma invoice | Return it; a drawing and an invoice that name different models cannot both be the basis of the pre-shipment check |
| 2 | Airflow direction and stage order | An airflow arrow, and the stages in the order they are built to: electrostatic stage first, then UV, then activated carbon | The duct run; the stage order on the quotation | Return it; a train drawn with a gas-phase stage ahead of the electrostatic stage puts grease on the lamps or the carbon |
| 3 | Overall envelope, with transitions | Total length, width and height of the configuration including transition pieces and the connections between modules, not the module envelopes alone | The straight run and the section measured on site; the ceiling void where a stacked arrangement is drawn | Ask for the installed dimensions; the sum of module envelopes is a floor, and the drawing is the first document that shows what sits between them |
| 4 | Flange size and hole pattern | Inlet and outlet flange A × B, and the hole pitch, diameter and edge distance, or the duct standard the pattern follows | The flange measured on the existing duct, or the duct drawing on a new build | Where the pattern differs, an adapter plate is drawn in and its length added to line 3; where it is not shown, ask for the flange detail |
| 5 | Service side and clearance | Which face the cells, lamps or carbon frames withdraw from, and the clear distance drawn in front of it | The side that is actually open on site, measured to the nearest obstruction rather than to the wall; the published maintenance space per module | Return it; a unit that fits but cannot be opened is a maintenance cost bought once and paid repeatedly |
| 6 | Weight and supports | The weight of each module as a separate load, and where the hangers, legs or plinth carry it | What the slab or the hangers at that position will carry, from the structural engineer, as three point loads for a three-stage train | Ask for the weights per module and the support points; the heavy module in a train is the carbon stage, and an average is not a load |
| 7 | Supply and electrical entry | The supply the units are built for (voltage, frequency, phase), where the cable enters, and where the isolator sits | The reading taken at the panel that will feed the unit, on row 7 of the enquiry sheet; the proforma invoice | Return it if the drawing carries the brochure default instead of the site supply; a unit built for the wrong supply is rebuilt, not adjusted |
| 8 | Power and control enclosure | Where the high-voltage power supply and any control panel are mounted, and whether that position can be reached for service | The plant room layout; the access route | Ask every supplier to mark it; an enclosure drawn on the far side of the duct from the access route is a service problem |
| 9 | Outdoor or wet position | Where the position is outdoors or on a roof, the ingress protection record the models carry, or the enclosure or weather hood that is in the supply | The position on row 4 of the enquiry sheet; the IP certificate naming the models | Ask for the record or the enclosure; an indoor model on a roof with neither is a water ingress waiting to happen |
| 10 | Scope of supply on the drawing | Each item marked as supplied by the equipment maker or by others: transition pieces, duct, fan, hangers, isolator, cabling | The included-items line of the quotation; the split agreed with the ventilation and electrical contractors | Ask for the marking; an unmarked transition piece arrives from nobody |
| 11 | Drawing control | A drawing number, a revision letter or number, a date, the model list, and a signature block for approval | The proforma invoice number; the previous revision, where one exists | Return an undated or unnumbered drawing; the approved revision is the baseline for the pre-shipment check and for any change afterwards |
Decision rule. IF lines 1, 5 and 7 are not all checked against the invoice, the site and the panel, THEN the drawing is not signed, whatever the other eight show, BECAUSE those three cannot be corrected on site. The wrong model is the wrong unit, the wrong service side cannot be opened, and the wrong supply is rebuilt at the factory. The other eight are corrected on the drawing or on site, by an adapter, a support, an enclosure or a marking, at a cost in time and money but not in a return shipment.
Envelope, flange and transitions: the lines that decide whether it reaches the duct
The drawing is checked against the duct you have, not the duct the catalog assumes, and three lines settle whether the configuration reaches it: the overall length with transitions, the flange size and hole pattern, and who supplies the adapter when the pattern differs. All three are worked from published per-model figures, which is why they can be checked on paper before anything is built.
The overall envelope. A datasheet gives the envelope of one module. A train is several modules plus whatever sits between them, and the drawing is the first document that shows the installed length. Our published 8,000 m³/h example sets out the floor: an LK80E1 electrostatic module of 1,524 mm, a UV80 of 1,511 mm and a CB80 of 1,427 mm add up to 4,462 mm of module length before any connection or transition is added, as worked through on our ecology unit installation page. On the drawing, line 3 is the figure after the connections and transitions are drawn in, and it is that figure, not 4,462 mm, that is held against the straight run measured on site. Where the run is short, the drawing shows a stacked arrangement with transition sections between the layers, which is one of the four layouts described on our kitchen ecology unit page. The check then moves to the ceiling void height and the transitions, not to a smaller unit, because the airflow is set by the kitchen and not by the plant room.
Flange and hole pattern. Line 4 is where a new installation and a replacement differ. On a new build the duct is drawn around the flange, and the datasheet figure (for the LK80E1, 1,277 × 614 mm) is what the ventilation contractor draws to. On a replacement the flange on the drawing has to match a flange that already exists, and two flanges of one overall size can carry different hole pitches, diameters and edge distances. The four measurements that settle this on site, the flange, the hole pattern, the clear access on the cell side and the static pressure still available, are set out on our ESP replacement page; the drawing check is where those measurements are compared with what the supplier drew. Where the patterns differ, an adapter plate is routine, and the drawing shows it, with its length added to line 3.
Who supplies the transitions. Our own scope, published on our installation and ecology unit pages, is the treatment modules and their control parts. The fan can be supplied with a kitchen ecology unit and is then selected against the total static pressure of the configuration. Ductwork, the transition pieces between the duct and the module flanges, installation labor and commissioning attendance are not supplied. On a drawing, that split has to be visible: every transition piece marked by maker or by others, so that line 10 can be checked against the included-items line of the quotation. A transition piece that is on the drawing and in nobody’s scope is the item that arrives from nobody.
Service side, supports and supply: the lines that decide whether it can be used
A unit that fits but cannot be opened, carried or connected is the error a drawing check exists to catch, and all three are visible on the drawing before anything is built. These are lines 5, 6 and 7, and they are checked against the site rather than against any document the supplier holds, because the supplier has never seen the site.
The service side. The collector cells withdraw sideways for washing, and the lamps and carbon frames withdraw from the access face of their modules. The drawing has to show which face that is on every module, and the clear distance drawn in front of it. The figure to compare with is measured on site to the nearest obstruction, which is a cable tray or a pipe as often as a wall. It is the figure that row 4 of our enquiry sheet asks for before a quotation is issued, because a cell that cannot be withdrawn is a unit that cannot be cleaned. Our UV and activated carbon modules publish a maintenance space of 1,000 mm in front of the access face; for an in-duct ESP the figure is model-specific and is confirmed with the configuration proposal, which is exactly why this line is checked on the drawing, where you ask for it to be shown, and not in a catalog. A drawing that puts the service face against the wall is returned, however well the rest of it reads.
The supports. Line 6 is read as point loads. In the published 8,000 m³/h example the electrostatic module weighs 116 kg, the UV module 55 kg and the carbon module 215 kg; those are three loads at three positions, and the carbon stage is the heavy one. The drawing has to show where each is carried, and the structural engineer has to confirm that the slab or the hangers at that position carry them. Where a stacked arrangement is drawn, the loads combine on one support and the line is checked again. The supplier gives the weights; the supplier does not design the support, and a drawing that shows a hanger symbol without a load is a drawing that has not been checked on line 6.
The supply. Line 7 is the line easiest to sign as drawn. The drawing carries a supply, and on a configured-to-order unit that supply is what the supplier was told; where the supplier was told nothing, it is the brochure default. Our units are configured to order for 220 V or 380 V at 50 or 60 Hz, and the supply built is the one written on the proforma invoice from the reading taken at the panel that will feed the unit, by the electrician making the connection. The drawing has to show that supply, the cable entry and the isolator position, and the check is that the three agree with the panel reading and with the electrical contractor’s route. A unit built for the wrong supply is rebuilt rather than adjusted, which is why this line is checked before production and not at commissioning.
The outdoor position. Line 9 applies only when the position is on a roof or otherwise exposed, and then it decides whether the drawing is complete. Ingress protection is classified by IEC 60529, Degrees of protection provided by enclosures, in its consolidated edition of 1989 with the amendments of 1999 and 2013, and a model either has a record under it, naming the model, or it does not. Our record is certificate BKC-190300574C of 2019, to EN 60529, naming LK30 to LK320 and LK30E1 to LK150E1 as tested to IP55. For a model outside that list, ours or anyone else’s, the drawing has to show the enclosure or weather hood that is in the supply, and line 10 has to say whose supply it is.
Decision rule. IF the service face on the drawing is the face that is open on site, the module loads are shown and confirmed, and the supply on the drawing is the panel reading, THEN lines 5 to 7 are signed, BECAUSE each has been held against a measurement rather than against the supplier’s assumption. IF any of the three was drawn from an assumption, THEN the drawing is returned with the measured value, BECAUSE the supplier can only draw what it was told, and an approval given on an assumption is the buyer’s approval of the assumption.
Signing off: revision, model list, and what a change afterwards means
Approve a numbered revision that lists the same models as the proforma invoice, and ask in writing what a change after approval does to the lead time and the price. Those two sentences are the whole of line 11, and they are the lines easiest to skip because they look administrative. They are not. The approved revision joins the signed proforma invoice as the baseline you run the pre-shipment check against; the twelve checks held against the invoice are on our pre-shipment inspection page. A drawing without a revision number cannot be part of that baseline, because nobody can say which version was approved.
What the signature should sit on: a drawing number and revision, a date, the model list matching the proforma invoice by model number and count, and a signature block naming who approved it and on whose behalf. Where an OEM order carries a cabinet color or a logo, that is confirmed on the drawing as well, since our published terms allow both on standard models and they are the kind of line that is agreed in an email and forgotten on the drawing.
What a change after approval means is a question for the supplier, in writing, before the change is made. Three questions cover it: whether the change re-opens the production lead time, whether it changes the price, and whether a revised drawing will be issued for a second approval. We do not publish a rule for those three, because the answer depends on what has already been built, and a published rule would not survive the first order already in production. What we do publish is that standard models are produced in 7 to 15 days. A change that arrives inside that window is a change to a unit that may already exist. Ask, and file the answer with the revision.
Our own drawings, against the sheet
Our drawings are issued on request for the offered configuration, drawn from the published per-model dimensions, flanges and weights, and kept confidential under NDA. That is the whole of what we publish about them, and it is enough to check them against the eleven lines, because the lines are checked against your site and your documents rather than against ours. The table below says what is published on our side for each line, what to ask for on the drawing before you sign, and what we need from you to draw it in the first place.
| Line | What is published on our side | What to ask for on the drawing, and what we need from you |
|---|---|---|
| 1 | The model list on the proforma invoice | Ask that the drawing names the same models and count; send the signed proforma invoice |
| 2 | Electrostatic stage, then UV, then carbon; the order we build to and do not vary | Send the duct run direction |
| 3, 4, 6 | Dimensions, flange size and weight per model on the LK-E series tables and the UV and CB datasheets | Send the duct section at the position, the straight run, and the clear height where a stacked arrangement is in question; ask for the transitions and the installed overall dimensions on the drawing |
| 5 | Maintenance space D = 1,000 mm on the UV and CB modules; for the in-duct ESP the figure is model-specific and confirmed with the configuration proposal | Tell us which side of the duct is open on site and the clear distance to the nearest obstruction; ask for the withdrawal side and the clearance to be shown |
| 7 | Units configured to order for 220 V or 380 V at 50 or 60 Hz; the supply built is the one written on the proforma invoice | Send the reading at the panel that will feed the unit, by the electrician making the connection; check that the drawing shows the same supply as the proforma invoice |
| 8 | Not on the published datasheets | Give the access route in the plant room; ask for the power and control enclosure to be marked against it |
| 9 | IP55 record BKC-190300574C for LK30 to LK320 and LK30E1 to LK150E1; outdoor and rooftop enclosure options on request for models outside that list | Say whether the position is outdoors |
| 10 | Modules and control parts supplied; the fan supplied on request and selected against the total static pressure; duct, transitions, labor and commissioning attendance not supplied | Send the scope split you have agreed with your contractors; ask for each item to be marked by maker or by others |
| 11 | Drawings and project details stay confidential under the NDA we sign | Say who signs on your side and give the proforma invoice number; ask for a numbered, dated revision with a signature block before you sign |
Two things we do not draw. We do not draw the duct or its access openings; those belong to the ventilation contractor under the code your reviewer applies, and the points at which an in-duct unit sits in that duct are set out on our grease duct requirements page. And we do not draw the support: we give the loads per module, and the hangers, legs or plinth are designed by whoever is responsible for the structure. Ask for both to appear on the drawing as interfaces marked by others, so that line 10 can be checked.
Scope and limits
The sheet checks a drawing. Three things sit outside it, and a drawing that passes all eleven lines has not done them.
- Selection. The drawing shows the configuration that was quoted; it does not show whether that configuration is the right one for the discharge. That is settled before the enquiry, on the inputs set out in our kitchen exhaust filtration guide, and a drawing of the wrong configuration can pass every line and still be the wrong unit.
- The fit of the train. Whether a three-stage train fits the plant room at all, with its straight run, support load, pressure allowance and access, is worked on the installation page before the drawing is ordered. The drawing confirms the fit for one arrangement; it does not discover it.
- Operation. Capture at the hood, the airflow the fan delivers, the condition of the cells and the cleaning regime decide the outlet in service. No line on a drawing measures them.
What this page does not do: it does not replace the approval of whoever reviews your installation, whose own document list is stated on row 9 of the enquiry sheet. It does not give a rule for what a change after approval costs, because we do not publish one. It does not draw the duct, the support or the electrical route, which belong to the contractors who own them. Where the position is a replacement in an existing duct, the measurements are taken first and the drawing is checked against them, as set out on the replacement page.
Buyer record and key takeaways
Before production is released, your file should hold:
- The approved revision of the drawing, with its number, date and signature block, tied to the proforma invoice number.
- The lines returned on earlier revisions, with the measured value each was checked against and the change that was drawn.
- The site measurements the drawing was held against: the straight run and section, the service side and clear distance, the flange and hole pattern on an existing duct, and the panel reading.
- The structural engineer’s confirmation of the module loads at the drawn support positions.
- The supplier’s written answer to the three questions on a change after approval: lead time, price, and re-issue.
Key takeaways
- Three lines cannot be fixed on site: the model list, the service side and the supply; they are checked against the invoice, the open side and the panel reading, and the drawing is not signed until all three match.
- The drawing is read against the site: the straight run, the duct flange and the nearest obstruction are measured, not taken from the catalog.
- Weights are point loads: three modules, three loads, and the carbon stage is the heavy one; the supplier gives the figures and does not design the support.
- Scope is marked on the drawing: every transition, fan, hanger and isolator by maker or by others; an unmarked item arrives from nobody.
- Sign a revision, not a drawing: number, date, model list and signature block, and the written answer on what a later change does to lead time and price.
Frequently asked questions
- What is a general arrangement drawing for an electrostatic precipitator order?
- The supplier’s overview drawing of the configuration that was quoted, issued after the proforma invoice is signed and before production starts. It shows the modules by model number in plan and elevation, with the envelope, the flanges and hole pattern, the service side and its clearance, the module weights and support points, the supply and electrical entry, and the scope of supply marked by maker or by others. The buyer or the contractor acting for the buyer checks it against the site and signs a numbered revision.
- Which lines on the drawing matter most?
- The model list against the proforma invoice, the service side against the side that is actually open on site, and the supply against the reading at the panel. Those three cannot be corrected after the unit is built: the wrong model is the wrong unit, a service face against the wall cannot be opened, and a unit built for the wrong supply is rebuilt rather than adjusted. The other eight lines are corrected on the drawing or on site: an adapter plate, a support, an enclosure or a marking.
- What do I do if the drawing does not fit the straight run?
- Return it with the measured run and ask for a stacked arrangement with transition sections drawn, rather than a smaller unit, because the airflow is set by the kitchen and not by the plant room. Then check the revised drawing again on overall height against the clear height, on the service face of each layer, and on the combined load at the support. Whether a train fits at all is worked out before the drawing is ordered, on the ecology unit installation page.
- Can I change the drawing after I have approved it?
- Ask the supplier in writing, before the change is made, whether it re-opens the production lead time, whether it changes the price, and whether a revised revision will be issued for a second approval. We do not publish a fixed rule for those three because the answer depends on what has already been built; standard models are produced in 7 to 15 days, so a change inside that window may concern a unit that already exists. File the written answer with the approved revision.
- How do you issue your own drawings?
- On request, for the configuration offered, drawn from the published per-model dimensions, flanges and weights, and kept confidential under the NDA we sign. To draw it we need the duct section and straight run at the position, which side is open for service and the clear distance to the nearest obstruction, the panel reading, and whether the position is outdoors. Before you sign, ask for the supply, the scope of supply and the proforma invoice number to be shown on it.
Holding a drawing you are not sure you can sign?
Send us the three site dimensions (straight run, duct section, clear distance on the service side) and the panel reading. If you hold our drawing, send the lines you would return against those figures and we issue a revised drawing. If you are still quoting the job, we quote and draw the configuration against the same inputs, with a reply within 24 hours on business days. If the drawing you hold is another supplier’s, the same three dimensions let us draw the configuration from our own range, so that the two drawings can be checked on one sheet.
Send the three site dimensions and the panel reading →
If the order has not been placed yet, the drawing is requested with the quotation; the inputs that let us draw it first time are rows 2, 4 and 7 of the ten-input enquiry sheet.
Why we write this. The drawing is the last document a buyer signs before a unit is built, and the one easiest to sign on the strength of the outline. The questions behind it are whether the cells will come out on the side that is open, and whether the voltage on the drawing is the one the unit will be built for. This page answers both by reading the drawing line by line against the site. It does not size or configure equipment; sizing and quotation live on the product pages.
Law manages project delivery at Polygee and reviews the airflow, stage and interface lines of offers against the site before an order is confirmed. Polygee, founded in 2004, manufactures the in-duct electrostatic precipitators, kitchen ESP hoods and kitchen ecology units named here and has exported to 50 countries. This page states our published terms and a method for checking a drawing; it is not a mechanical design, a structural calculation or an approval of any installation.
References & further reading
- Ingress protection: IEC 60529, Degrees of protection provided by enclosures (IP Code), consolidated edition 1989 with amendments 1 (1999) and 2 (2013). webstore.iec.ch
- Our own terms and the order steps: the supplier profile (five steps from enquiry to delivery, lead time, NDA) and the enquiry sheet (rows 4 and 7: the service side and the panel reading).
- Published per-model figures the drawing is drawn from: the LK-E series page (dimensions, flange and weight by model) and the kitchen ecology unit page (the four installation layouts).
- The two pages this one leans on for the fit of a train and the measurements on a replacement: ecology unit installation and commercial kitchen ESP replacement.
Related reading
- Electrostatic precipitator pre-shipment inspection: the twelve checks run against the signed proforma invoice before the balance is paid, once the drawing is approved.
- Ecology unit installation: whether a three-stage train fits the plant room at all, worked before the drawing is ordered.
- Commercial kitchen ESP replacement: the four site measurements a replacement drawing is checked against.
- Electrostatic precipitator datasheet: the fifteen fields the drawing is drawn from, and which of them need a basis.