What You're Actually Buying
This is a carbon-impregnated cabin air filter, not a basic dust filter. The carbon layer knocks down diesel fumes and odor coming through the HVAC intake - matters a lot if you're idling at a dock all night or running behind another truck's stack. Volvo Group uses this same filter across VNL day cabs and sleepers plus Mack trucks built on shared platforms, which is why one part number covers both badges.
On the Freightliner side, Cascadias built 2008 through 2024 used a cabin filter housing that takes the same core dimensions - same length, width, and pleat depth - so the Fleetguard AF26405 and Donaldson P606555 numbers show up on both applications. It's the filter box geometry that matters here, not the truck brand on the hood.
Two filters usually run together in these cabs - one on the fresh air intake side and sometimes a second smaller one. Check your old part before ordering to make sure you're replacing the right one.
How These Numbers Actually Cross
20435801 is Volvo's part number, VO20435801 and VOE20435801 are how it shows up in parts catalogs and some ordering systems - same filter, different prefix conventions. AF26405 is Fleetguard's number for the identical core, P606555 is Donaldson's version, and Mahle/Mann/Hengst/Baldwin/Bergstrom all built to the same spec because Volvo Group sourced from multiple filter manufacturers over the years.
What you're watching for isn't fitment risk in the usual sense - no splines or bolt patterns here - it's overall filter dimensions and whether your housing takes one filter or a filter pair. Cabin filter housings on these trucks changed slightly across model years, so a Fleetguard AF27684 or Donaldson P606720 might be a running change or a different housing depth, not a straight swap.
Rule of thumb: pull the old filter, read the number stamped on the frame, and match it against this list before you order. If the number's worn off, VIN lookup through us will get you the right one - don't guess off the truck's build year alone since cab configurations varied.
Ordering From Us
We stock this one in Tacoma and it goes out same-day if you're local - walk in, we'll match it to your old filter on the counter. Ship nationwide too if you're not near us, and it typically lands in a couple days depending on where you're at.
Comes with our standard 6+ month warranty. This is a straightforward wear item - no core charge, no return shipping headache if it's the wrong number, just tell us before you install it if something looks off.
Aftermarket carbon filters like this run noticeably cheaper than dealer pricing on the same 20435801 number, and the filtration spec doesn't change based on who stamped the metal frame. Confirm your number, order it, move on.
20435801 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 20435801. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| Fleetguard | AF26405, AF27684 |
| Donaldson | P606555, P606720 |
| Baldwin | PA4681 |
| Cross-Reference | VO20435801, VOE20435801, 7979 |
| Mann Filter | CU3161 |
| Hengst | E6909LI |
| Mahle | SC60056 |
| Bergstrom | 1000039641 |
Frequently asked questions
Does 20435801 fit my Freightliner Cascadia?
If your Cascadia's cabin filter housing takes an AF26405 or P606555 Donaldson filter, then yes, 20435801 crosses to it - same core. Cascadia cabin filter setups changed some over 2008-2024 production, so pull your old filter and check the number stamped on the frame before ordering, or give us your VIN and we'll confirm it.
Is this the same as the Fleetguard AF26405?
Yes - AF26405 is Fleetguard's part number for this same carbon filter, just their catalog naming instead of Volvo's. Same dimensions, same carbon media. Confirm by comparing the old filter's stamped number to what's listed here, since running changes do happen.
Why are there so many different brand numbers for one filter?
Volvo Group didn't make this filter in-house - they had Fleetguard, Donaldson, Mahle, Mann, Hengst, Baldwin and Bergstrom all supply to the same spec at different points, so each brand stamped their own part number on an otherwise identical filter. That's normal for cabin filters across most truck brands.
Not sure it fits? We check before you pay.
Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
More cross-reference guides
Need the part, not just the reading?
Every part below is a Premium Quality aftermarket Direct Replacement with published OEM cross-reference numbers, a 6+ month warranty and same-business-day shipping from Tacoma, WA. Not sure it fits? Run your VIN — or call and a person who knows trucks will verify fitment before you pay.