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Since January 1, 2007, every on-highway diesel engine produced has included an emission after-treatment device known as a Diesel Particulate Filter (DPF). This device is installed in the exhaust stream similar to a muffler but is comprised of two chambers.

The first chamber is designed to oxidize a portion of the NO in the exhaust to NO2. In the second chamber, exhaust is forced through a wall-flow filter where the gaseous components pass through but soot is trapped. The trapped soot is then destroyed by the NO2 product produced by the first chamber. The end result of this process is a small amount of inert ash which remains in the filter. Over time, this ash will build up and reduce the effectiveness of the DPF and must be cleaned.

National Fleet Management is equipped and ready to be your source for DPF cleaning. We have the required equipment and expertise to clean all makes of particulate filters. Regardless of the engine configuration in your on-road equipment,

National Fleet Management can provide cleaning services for your DPF.
The diesel particulate filter (DPF) clock has been ticking for more than two years now. Fleets that bought trucks with EPA 2007 engines will be reaching their maximum 250,000 mile service intervals soon and need to be removed from their trucks and cleaned.

Two Levels Of Cleaning
There are two levels of cleaning available for DPF Filters. A Level 1 cleaning is performed by blowing out the ash from the filter utilizing a specialized piece of equipment to ensure that the filter surface is systematically and completely cleaned. A Level 2 cleaning is a thermal process. The filter is processed in a burner that allows for exacting control of heat to remove additional soot without damaging the filter material.

National Fleet Management Inc. DPF Cleaning Service
National Fleet Management can clean diesel particulate filters for customers on either an as-needed basis or under contract. We can receive filters from anywhere they can be shipped. National Fleet Management inspects, cleans, tests and returns the same filter to the customer who sent it in. We do not exchange or substitute filters. All filters are recorded by serial number in our database with the associated results from cleaning. We also can exchange your DPF upon request.

Inspection and Testing
National Fleet will inspect and test the filter. When we are finished processing the DPF, we know the exact condition of the filter and have absolute confidence and knowledge of the level of recovery. Cleaning results are shared with the customer and can be compared with historical recovery levels for the filter.

Cleaning Results
National Fleet cannot and does not guarantee or warrant that we can achieve recovery of the filter. Filters can fail for a variety of reasons as a result of operating conditions. The primary source of failure is unusual thermal events that have caused sintering, failure of the cell walls or melting of the ceramic sub-strait. Filters can also be damaged by dropping them, thermal shocking them, excessive oil soaking, chips and vibration. Due to design and materials some filters last longer than others or can with stand higher temperatures.

Overall Filter Life
Overall, filter life decreases when impacted ash is left in the filter cells. The deeper the impacted ash becomes, the harder it is to remove in subsequent cleanings. The risk of sintering increases when ash is left in the filter. Ash stuck in the filter causes cold cells and leads to premature soot plugging. The cleaner the filter is kept, the longer the overall life. National Fleet Management recommends filters to b pulled annually on a preventative maintenance basis to help extend the life of the filters and reduce the costly expense of replacing them.

Time between Cleanings
National Fleet Management cannot control the time between cleanings and makes no guarantees. Filters can be re-plugged within hours if the engine is malfunctioning, operating temperatures are out of specification or if the wrong fuels or lubricants are used. It has been stated that filters run 240,000 miles after cleaning and filters that re-plugged in two hours. The ash that plugs a filter loads lineally in the filter based on engine hours and rpm. The loading rate of ash will vary due to the lubricants used, engine condition, and fuel quality. Usually it takes quite a period of time to plug a filter with ash. Soot plugging can occur very quickly and is usually due to a very unfavorable operating condition such as low filter temperature or engine problems.

Retrofit filters without passive regenerations systems typically plug with soot much more often than engine systems equipped with active on-board regeneration systems. Active regeneration systems have the ability to burn off accumulated soot and thereby keep the filter clear.

Not in our local area? Ship them in!!!!! NATIONALY!

We will:
1. Ship them to out to Concord location.
2. Ship your cleaned filter back to you (freight collect).
3. Call to see if we can pick up in your area.

DPF are very expensive filters and should be treated with care. Make sure your shipment is adequately packaged for rough motor freight conditions. The filter should be placed in a sealed bag or container. Make sure the packaging protects flanges or rims from denting. Do not leave the ceramic face exposed. National Fleet will repackage the filter in the materials you sent it in. Any filter requiring to be repackaged will have additional charges passed on to the owner.

Prices will be provided upon request. Prices may vary due to filter size and filter design and whether the filter needs to go forward to a Stage 2 thermal cleaning.

Payment is due prior to shipping unless credit has been pre-approved. Payments can be made using: Cash, Credit Card, or Money Order/Bank Check.