How Diesel Particulate Filters work How to avoid DPF problems How much is it to clean a DPF? A Diesel Particulate Filter — known as a DPF for ease — is part of a diesel car's exhaust system, designed ...

This includes homemade air purifying devices made from a box fan and an HVAC particulate air filter, he said. Montrose said these homemade purifying boxes are highly effective and cost-effective ...