HVAC Duct Machine Buyer's Checklist — 47 Pre-Purchase Verification Points

Why this checklist exists

A six-figure HVAC duct machine purchase is a 10–15 year decision. Most procurement disputes we see in the field — and we have commissioned more than 5,000 SBKJ machines across 80+ countries since 1995 — are caused by the same handful of skipped verifications: wrong coil specification, no Factory Acceptance Test, ambiguous Incoterm, no spare-parts commitment, and a 100% upfront payment term that nobody pushed back on. The other 42 items below are leverage multipliers, but those five catch most catastrophic mistakes.

This checklist is the same one our engineers walk through with first-time buyers — including buyers who end up purchasing from our competitors. The cost of a thorough verification is one Friday afternoon. The cost of skipping it is ten years of fighting your supplier over warranty, spare parts and PLC source code.

Print it. Score every shortlisted vendor against it. The supplier that survives 47 questions is the one who will still be answering your phone in 2036.

Category 1 — Factory and Company Verification (8 items)

The single largest mistake first-time buyers make is signing with a trading company that re-labels somebody else's machine. The eight items below filter that out in 30 minutes.

1. 1. Manufacturer or trader? Confirm you are talking to the actual factory. Three quick checks: ask for the factory address (then verify on a map), ask to see the production floor on a live video call, and ask who holds patents on the design.
2. 2. Business registration record. Request the supplier's business licence. Confirm registration year, registered capital, authorised representative and listed business scope match the company you are negotiating with.
3. 3. Annual production volume. Ask how many machines of your specific model the factory has shipped in the last 12 months. Under five units of your model is a quality risk — you will be a learning project.
4. 4. Reference customers. Request three customer references in your region or vertical with installation dates, machine models and contact details. Phone two of them.
5. 5. Trading history. Confirm the supplier has been continuously trading for at least ten years. Short trading history is a red flag for spare-parts continuity over the machine life.
6. 6. Factory address verification. Confirm the address on Google Maps street view or satellite imagery shows an industrial-zoned facility consistent with the production capacity claimed.
7. 7. Workforce size. Verify the supplier employs at least 50 people for an auto duct line manufacturer. Under 30 employees is unlikely to support after-sales globally.
8. 8. Patent and IP audit. Request the patent list and verify three random patents on the national IP database (IP Australia, USPTO, EPO). Fake or expired patents are common.

Category 2 — Machine Specifications and Performance (10 items)

The second-largest source of disputes is buying on brochure specs and discovering the machine performs differently with your actual coil. Lock these ten down before signing.

9. 9. Coil match. Confirm the machine accepts your exact coil width, thickness and material. Specifying 1,250 mm slit coil and ordering 1,550 mm sheet stock is a commissioning-day disaster.
10. 10. Single-shift output. Ask for single-shift output measured with your coil specs — not the brochure number which is tested at ideal conditions on the supplier's test coil.
11. 11. Tolerance specifications. Verify length, width and squareness tolerances meet the standard your project requires (SMACNA, EN 1505, AS/NZS 4254 or DW/144).
12. 12. PLC ownership. Ask whether the PLC programme is open or proprietary, and who holds the source code. Proprietary PLCs lock you into single-source maintenance for the machine life.
13. 13. Control system brand. Confirm the PLC brand (Siemens, Mitsubishi, Delta, Allen-Bradley) and HMI brand. Branded PLCs are repairable globally; white-label or no-name PLCs are not.
14. 14. Electrical specifications. Confirm the machine is wired for your country's voltage and frequency. 380V/50Hz versus 480V/60Hz changes motor selection — rewiring after delivery is expensive and voids the CE marking.
15. 15. Tooling lifespan. Ask for documented tooling lifespan in metres formed before regrinding. Under 100,000 m is below industry standard for hardened tooling.
16. 16. Safety guarding. Confirm safety guards meet CE Machinery Directive 2006/42/EC — interlocked guards on all moving parts, emergency stop wired through a safety relay.
17. 17. Floor footprint. Confirm the machine fits your workshop with run-out tables and coil storage. Request a 3D CAD layout drawing as part of the quotation.
18. 18. Utility requirements. Verify electrical load (kW), compressed air consumption (m³/min at 6 bar), hydraulic oil grade and any waste evacuation requirements before signing — retrofitting a workshop is more expensive than specifying it correctly.

Category 3 — Quality and Certifications (6 items)

Counterfeit certificates are common. Always verify on the issuing body's database before relying on them.

19. 19. CE certificate verification. Request the CE certificate, confirm the issuing notified body number (4-digit code), and search the body's database to confirm the certificate is current and not revoked. Many cheap suppliers attach CE certificates that are expired or for a different machine model.
20. 20. ISO 9001 verification. Request the ISO 9001:2015 certificate, confirm the certifying body is internationally recognised (TÜV, SGS, BSI, DNV, Bureau Veritas), and verify the certificate is current on the certifier's website.
21. 21. Welding qualifications. For machines with welding components, request welder qualification records and weld procedure specifications. Uncertified welds invalidate CE marking on pressure-bearing assemblies.
22. 22. Material traceability. Request mill certificates for the steel used in the machine frame and roller assemblies. Non-traceable steel is a quality risk and a red flag in any third-party audit.
23. 23. FAT procedure. Confirm the supplier runs a Factory Acceptance Test before shipment with your nominated coil and a full production cycle. Refusal to do a FAT is an outright deal-breaker.
24. 24. QA records access. Ask to see in-process inspection records and final QA sign-off forms for three recently shipped machines. Supplier transparency here is the strongest quality signal.

Category 4 — Commercial Terms (8 items)

The supplier who saves 5% on sticker price often costs 30% more once you read their cancellation clause and warranty fine print. Lock these down before signing.

25. 25. Payment terms. Standard is 30% T/T deposit at order confirmation and 70% balance against bill of lading copy or before shipment. Walk away from any supplier demanding 100% upfront. Letter of Credit at sight is acceptable for orders above USD 100,000.
26. 26. Incoterm specification. Choose between EXW, FOB Melbourne, CFR, CIF or DDP. CIF is the most common for first-time buyers because the seller handles export customs and main carriage to your destination port.
27. 27. Currency and exchange rate. Lock the contract currency (USD or EUR) and confirm the exchange rate basis. Floating rates can shift landed cost by 5–8% on long lead times.
28. 28. Itemised landed-cost worksheet. Request a single-page worksheet showing machine price, freight, marine insurance, import duty, broker fees, inland trucking and rigging. Comparing apples to apples requires every supplier to use the same format.
29. 29. Cancellation clause. Read it carefully. Industry standard is forfeit of deposit if cancelled after raw material is cut, full refund if cancelled within 14 days. Some suppliers hide aggressive cancellation penalties in clause 18 of a 24-page contract.
30. 30. Warranty period. Standard is 12 months from commissioning or 18 months from bill of lading, whichever is sooner. Anything less than 12 months from commissioning is below industry standard.
31. 31. Liquidated damages clause. For projects with go-live deadlines, negotiate a liquidated damages clause for late delivery — typically 0.5% per week capped at 5% of contract value.
32. 32. Dispute resolution forum. Confirm contract jurisdiction (Hong Kong arbitration, SIAC Singapore, ICC Paris, or local court). jurisdiction-specific courts are slow and unpredictable for foreign claimants.

Category 5 — Logistics and Customs (6 items)

A perfectly built machine still fails the project if it arrives damaged, late or with the wrong customs documents. These six items keep the container moving.

33. 33. Shipping mode and port. For machines under 25 tonnes, choose 40-foot high-cube container. Over 25 tonnes, consider break-bulk or flat-rack. Confirm departure port (Melbourne, Sydney, Brisbane) and your destination port at quotation stage.
34. 34. Crating specifications. Request fumigated wood with ISPM-15 stamp for North America, Australia, EU and most other markets. Non-compliant crating is impounded at customs and the buyer pays demurrage at port-storage rates.
35. 35. Desiccant and humidity protection. Confirm the supplier includes humidity indicators and adequate silica gel desiccant for sea freight. Long-haul ocean transit damages bare steel rapidly without protection.
36. 36. Marine insurance. Either buy supplier marine insurance (CIF) or arrange your own (FOB). Never ship a six-figure machine without all-risk cargo cover including general average.
37. 37. HS code declaration. Confirm HS code on commercial invoice is 8462.49 or 8479.89 for most HVAC duct forming machinery. Wrong HS code triggers customs inspection delays and penalty duty assessments.
38. 38. Certificate of origin format. Confirm the supplier issues a Form A, generic CO, or specific FTA certificate matching your country's import requirements. Some bilateral FTAs require specific CO formats to claim preferential duty rates.

Category 6 — Installation, Commissioning and Training (5 items)

The container landing on your dock is not the end of the project — it is the start of the high-risk phase.

39. 39. Installation supervision. Contract should include 1–2 supplier engineers on site for 5–10 days for installation, mechanical commissioning and electrical commissioning. Quoted in days, not as a lump sum.
40. 40. Training scope. Operator training (8–16 hours), maintenance training (4–8 hours) and a written commissioning report should be included. Verify the language and competency level of the trainer — a trainer who cannot read your operators' English manual is unhelpful.
41. 41. Visa logistics. Confirm the supplier handles their engineers' business visas to your country. If you have to sponsor the visas, the timeline can extend project handover by 4–8 weeks.
42. 42. On-site safety induction. Supplier engineers will need PPE, your site safety briefing and any country-specific certifications (e.g. Saudi Aramco contractor pass, Australian White Card, EU SCC). Flag the requirement at contract stage.
43. 43. First-article acceptance. After commissioning, run a first-article duct under buyer presence and sign off against the contract performance specification. This triggers the warranty start date.

Category 7 — After-Sales and Spare Parts (4 items)

The supplier you buy from for the next decade is not the one with the lowest sticker price. It is the one who is still answering your spare-parts emails in 2036.

44. 44. Spare parts package. Standard is a one-year wear-parts kit shipped with the machine. Verify the parts list, item codes and any consumables (PLC backup battery, hydraulic filter, sensor sets, V-belts).
45. 45. Spare parts lead time. Ask for documented spare parts lead time to your country — under 14 days for stocked items, under 45 days for build-to-order — and the airfreight cost basis (DAP your warehouse vs EXW supplier).
46. 46. Remote support commitment. Standard is 72-hour response via WhatsApp or video call. Confirm time-zone coverage and the language of the responding engineer.
47. 47. Parts continuity guarantee. Ask the supplier to confirm in writing they will support your specific machine model with original spare parts for at least 10 years. Short-cycle suppliers go silent after 5 years and you are forced into a full-line replacement.

How SBKJ scores against this checklist

We use this exact 47-point checklist when our customers ask us how to evaluate their shortlist — and we score ourselves against it on every quotation. Here is the short version of where SBKJ stands:

• Factory and Company Verification — manufacturer (not trader) since 1995, 100–250 employees, 60+ patents, 5,000+ machines installed in 80+ countries. About SBKJ Group.
• Machine Specifications — every machine sized to buyer's coil specification before quotation, single-shift output measured against buyer's coil, Siemens or Mitsubishi PLC standard, full CAD layout drawing supplied with every order. SBKJ machine catalogue.
• Quality and Certifications — ISO 9001:2015 certified, CE marked, FAT mandatory on every auto duct line. See our quality control process.
• Commercial Terms — 30/70 T/T standard, L/C at sight accepted above USD 100K, itemised landed-cost worksheet on every quotation, dispute resolution at HKIAC. See pricing and lead time guide.
• Logistics and Customs — ISPM-15 fumigated crating, HS code 8462.49 or 8479.89 declared, full marine insurance documentation, choice of CIF or FOB Melbourne.
• Installation and Training — 1–2 SBKJ engineers on site for 5–10 days, operator training, written commissioning report, multi-language trainers (English/Mandarin standard).
• After-Sales — one-year wear-parts kit standard, 72-hour remote support, 10-year+ parts continuity (we still support machines installed in 2002), Australia office in Box Hill North VIC for English-speaking after-sales.

Get an itemised SBKJ quote against this checklist →

FAQ

What are the most important checklist items?

The four highest-leverage items are: confirm you are buying from the manufacturer not a trader, require a Factory Acceptance Test, verify CE and ISO 9001 are current and traceable, get an itemised landed-cost worksheet on the same Incoterm from every supplier. The remaining 43 items are multipliers but these four catch most catastrophic mistakes.

How long does a complete vendor evaluation take?

For a six-figure machine purchase, plan for 4–8 weeks: 1–2 weeks RFQ and shortlist, 2–3 weeks technical and commercial deep-dive on top 2–3 vendors, 1 week factory visit, 1–2 weeks contract negotiation and FAT scheduling. Compressing below 4 weeks correlates strongly with post-installation disputes.

Should I do a factory visit or is a video walkthrough enough?

For first-time buyers and orders above USD 100,000, an in-person visit is the cheapest insurance you can buy. For repeat orders or verified suppliers, a 90-minute live video walkthrough of the production floor, QA bench, PLC integration test station and crating area is sufficient.

What payment terms should I push back on?

Walk away from any supplier demanding 100 percent upfront. Industry standard is 30 percent T/T deposit and 70 percent balance against bill of lading copy or before shipment. SBKJ supports 30/70 T/T or L/C at sight, never 100 percent prepayment.

What documents should be in the export pack?

Commercial invoice, packing list, bill of lading, certificate of origin, CE certificate, ISO 9001 certificate, signed FAT report, machine ID plate photos, electrical drawings and PLC programme backup on USB, operator and maintenance manuals in English, and HS code declaration. SBKJ provides all of these as standard.