DIY Cabin Air Filter

[PatrickJohnson]

the filter is post-ac, it only filters the air coming out of the blower of the ac unit. as such, the unit's operation is unaffected by leaving it out, it just means that whatever allergens/dust your external ac air intake suck in will end up in some amount inside your cabin. with the filter in place, the dust that makes it to your cabin is greatly reduced, and with an allergen rated filter you can cut down on pollen and the like. helps allergies while driving.