Emissions control systems for today’s air quality standards

The CleanAIR PERMIT™ DPF –
Catalyzed Particulate Filter for Diesel Engines

The PERMIT™ DPF is now CARB Verified Level 3 Plus!


The PERMIT™ DPF: DPF/muffler design, with bolt flanges and standard design with end cones.

PERMIT™ DPFs from CleanAIR Systems are designed to control particulate matter (PM), carbon monoxide (CO) and hydrocarbons (HC) from any size diesel engine. Utilizing a wall-flow ceramic filter coated with CleanAIR’s unique catalyst, the catalyzed particulate filter dramatically reduces black smoke and odor associated with diesel exhaust.

The PERMIT™ DPF is packaged in a 304L stainless steel shell, finished by bead blasting, offering a highly corrosion-resistant product that will last for years.

All PERMIT™ DPFs are available as standard filter design, DPF/muffler design or DPF/Silencer design.

Flow of exhaust for Permit DPF
To replay, press your refresh button.

CARB verified Permit DPFs
Industrial grade PERMIT
DPF/Silencer with two filters

Permit DPFs for prime & emergency generators
Critical grade PERMIT
DPF/Silencer for 750 kW generator

PERMIT™ DPF

CARB Verified Level 3+ for prime power and emergency generators
For stationary generators, pipeline compressors, and pumps.
Passive regeneration.
Reduces diesel particulate matter by greater than 85%.
Reduces carbon monoxide (CO) and hydrocarbons (HC) by up to 95%.
Durable, all stainless steel construction, fully insulated silencer for long life.
Rust resistant.
Sound attenuation.
Custom design.
Up to 50% weight reduction over mild steel construction.
Easy to install.
Available for all engine sizes.
Comparable in price to mild steel construction, with all the benefits of stainless steel.