OTR Cabin Air Filters have Expertise Built In , being made with the highest quality media and engineered to OEM fit, form and function. This heavy duty cabin air filter replacement is manufactured at an ISO9001-certified facility that has more than 30 years of experience making heavy duty filters. The OTR cabin filter is purposed to improve air quality by keeping dust, mold spores, pollen and pollution at bay. FleetPride is your First Click in Heavy Duty .