Most "how to choose a supplier" articles tell you to check price, quality and communication. That is not a checklist; that is a horoscope. Here are the eight checks that actually predict whether your air purifier OEM program will survive its second year — in the order experienced buyers run them.
1. Certification depth, per model
Certifications are issued per model. Ask for the exact certificate list for the SKUs you intend to buy, mapped to your target markets: ETL/UL for North America, FCC and CARB for US platforms and California, CE/UKCA for Europe, PSE for Japan, KC for Korea, RCM for Australia. A factory that answers with a logo wall but no per-model mapping will cost you a listing suspension later. Start with our compliance-by-market map as a reference format.
2. Filter engineering ownership
The machine is the razor; the filter is the blade. Ask who manufactures the HEPA and carbon filters. If it's outsourced, your replacement consumables — your repeat revenue — depend on a supplier you never audited. HOKO runs its own RMB 20M filter division (2M sets/year) for exactly this reason.
3. MOQ structure
Match MOQ to your channel reality. For private label on proven platforms, 500 units is the serious threshold — below that, you are buying a trading company's stock. For new-tooling ODM, MOQ should be project-based, tied to mold amortization.
4. AQL and outgoing inspection
Ask what happens to every unit, not every batch. Reference standard: 100% outgoing inspection across 20+ categories, per-unit aging (one hour, networked), and pressure testing for water appliances. Then ask for the traceability system — a QR code per unit that resolves to material batch, process and inspection data.
5. Customization depth vs. your roadmap
Light customization (color, logo, packaging, panel) gets you to market in 40–50 working days. If your roadmap needs differentiated industrial design, verify the factory owns mold making in-house — 200+ molds/year of capacity and mold-flow analysis reports are the tell. See our ODM pipeline.
6. Lead time, in writing
40–50 working days is the honest range for customized mass production of small appliances. Anything quoted under 30 days for a customized run is either stock or a promise that will slip.
7. Sample policy
Stock samples in 1–7 days, new sampling in 7–35 days, sample fee refundable against the formal order (ours is 1.3× production price, refunded) — this structure aligns the factory with your success. Free samples sound generous; they usually mean the factory doesn't filter buyers.
8. Communication as a system
Response time within one working day, a named export contact, and engineering that joins calls when the question gets technical. Test this before you pay a deposit: send a per-model certification question and see whether the answer is a document or a slogan.
Run us through all eight. Get a quote with your target market and quantity — the reply will include the per-model compliance package, not a brochure.