What is an FPN?

A manufacturer part number can appear in a compatible aftermarket listing. That reference describes intended fit; it does not make the aftermarket part the same product as the manufacturer part. Distinct products retain separate FPN identities.

Compare retailer offers for the same identified part in the parts catalog, where the manufacturer, part number and appliance fitment must agree. A compatibility claim alone is not evidence to merge products.

Replacement parts live in a messier world than appliances. The same door gasket sells under the manufacturer’s number, a distributor’s number, and half a dozen marketplace listings — and none of those agree. The FPN cuts through it the same way the FIN does for appliances: one permanent Fridge.com identity per physical part, so prices and fitment information aggregate under one anchor in the parts catalog.

The boundary is strict by design. An appliance carries a FIN and never an FPN; a part carries an FPN and never a FIN. Even accessories for a filter — a filter cap, a filter housing, an ice-maker line installation kit — are parts, because you buy them to repair or install, not to replace on a schedule.

An FPN is minted when a part enters the catalog and never changes afterwards — not when the title is cleaned up, not when the brand is corrected, not when a retailer relists it. If a part is ever removed, its number is retired, never reused. That permanence is what makes the identifier safe to cite: an FPN in a bookmark, a spreadsheet, or an AI assistant’s answer keeps meaning the same physical part.

A filter is not a part. Water, air, inline and ice-machine filters are consumables with their own identifier — the FFN — and their own filter catalog. The four Fridge.com systems are always named in the same order: FIN, FPN, FFN, FIS — three permanent identifiers, then one score.