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07-15-2009 10:21 AM
You can research passive and active diesel particulate systems on the CARB website at http://www.arb.ca.gov/diesel/verdev/vt/cvt.htm. All Level 3 verified products must reduce PM greater than 85%. There are many differences between passive and the newer active system technologies, such as cost, complexity, ease-of-use, and ease of installation. There are also differences in quality such as products made of stainless steel vs. mild steel.
For a product that offers optimal performance for a specific application, look into companies with custom design and fabrication services. In this way, you work with a design engineer to create a system that fits your customer's space requirements, installation needs, inlet/outlet location and mounting requirements. If a system is designed specifically to fit an application, installation will be much easier, therefore lowering your cost of installation.
CleanAIR Systems' diesel particulate filter is CARB verified Level 3 for prime and emergency engines. http://www.cleanairsys.com/products/filters/index.