How to Cross-Reference Dust Collector Filter Part Numbers Across Brands

You have an OEM part number – Donaldson Torit, Camfil Farr, Camcorp, AAF – printed on a worn label or buried somewhere in the maintenance binder. The collector is due for a change-out, and your usual supplier is either out of stock, quoting a six-week lead time, or charging more than the budget allows. Cross-referencing is how you will find a compatible replacement somewhere else.

A good cross-reference goes well beyond matching a number on a sticker. The right replacement comes down to five physical and performance specs, and missing any of them tends to show up in the change-out a couple months later.

Why a Part Number Alone Isn’t Enough

A part number is a label. Compatibility is physics, and treating one as a stand-in for the other is where most cross-reference mistakes start. Three things tend to go wrong.

OEMs revise cartridge designs over time. The same number can refer to different end-cap configurations or media specs depending on the production year. Numbers also get printed incorrectly, wear off in service, or differ between the unit’s nameplate and the cartridge that was last installed – especially when a previous maintenance team made their own cross-reference call without documenting it.

The bigger problem is downstream. Aftermarket suppliers vary in how strict they are about matching specs. A filter that shares an OEM number on a listing page can still have a thinner pleat pack, a different media weight, or a gasket in the wrong place.

The result shows up later: differential pressure climbs too fast, the cartridge blinds prematurely, or in applications with combustible dust or chemical exposure, the wrong media creates a safety problem.

The Five Specs That Actually Drive Compatibility

The bottom line: Dimensions and end caps are go/no-go. Media and efficiency depend on the application. Here’s what each spec is doing and why it matters.

A note on media: Media is the spec most often overlooked. For a deeper look at blended construction, see our overview of 80/20 blended media, and for a fuller breakdown of media options, our guide to dust collection filter media. For the strictest requirements, see HEPA versus standard dust collector filters.

How to Cross-Reference a Filter Part Number, Step by Step

Here are six steps from label to confirmed quote.

1. Locate the OEM part number on the existing filter. It is usually printed on the end cap or a wraparound label.
2. Cross-check that number against the collector’s nameplate or operations manual. The unit model – a Donaldson Torit Downflo II, a Camfil Farr Gold Series, or a Camcorp baghouse – matters as much as the filter number itself.
3. If the label is illegible, measure the cartridge. OD, ID, length, and a clear photo of the end cap will get you most of the way there.
4. Identify the OEM and the collector model family. This narrows the cross-reference quickly.
5. Match the five specs against the aftermarket equivalent. Dimensions and end caps are go/no-go. Media and efficiency depend on the application.
6. Confirm with the supplier before ordering. A quote request with the OEM part number, the unit model, and a brief note on the application is faster than searching a chart, and gives the supplier a chance to flag a mismatch before the filter ships.

Common Mistakes

The most common error is treating the OEM part number as the whole answer. The number tells you what was installed last. It does not tell you if that filter was correctly specified for the application in the first place, and it does not flag any design revisions the OEM has made since.

A few other recurring mistakes worth noting:

Brands AirMax Cross-References

AirMax stocks OEM-equivalent replacement filters, cartridges, bags, and baghouse cages for more than fifteen dust collector brands.

Have a baghouse and need quality replacement filters? AirMax stocks cross-references for Donaldson Torit Downflo cartridges, Camfil Farr Gold Series, and most other major OEM lines. Our brand-specific catalogs include:

Send Us the Part Number

Cross-referencing gets a lot faster when the supplier already stocks the equivalents and knows which OEM revisions matter. If something looks borderline, we’d rather flag it before the filter ships than after.