Need a backpack blower air filter
 

Husqvarna 145BT
pn 531004430

None of the local stores has anything close.
Amazon has OEM for $22 or cheap plain foam for about $8. The factory filter has some sort of layer on one side of the foam. The cheap stuff is just foam.

Is there any reason to buy the factory filter for 3 times the price? What does the PP braintrust say?

I'd get the $8 version, myself, Joe.

YMMV.....

Are you looking at the "OEM" that also has a part number 11013-2179 on Amazon? I did a search and found that PN elsewhere for 9.79 plus shipping.

Personally, I think I'd buy the foam filters and then some foam filter oil and call it a day.

Amazon
https://www.amazon.com/Husqvarna-Part-Number-531004430-Filter/dp/B013TDIZJC/ref=sr_1_1?dchild=1&keywords=Husqvarna+531004430&q id=1605791076&sr=8-1#customerReviews

Pro Parts Direct
https://www.propartsdirect.net/Parts/Element-Air-Filter__11013-2179.aspx

Russo Power
https://www.russopower.com/parts/kawasaki-11013-2179

If the filter on Amazon labeled as a Kawasaki filter will fit, so will these using the Kaw PN