Exhaust Removal and Air Filtration Systems Defined

There are several technology options available to remove vehicle exhaust emissions: Source Capture Systems, Diesel Particulate Filter, Air Cleaning Systems and Simple Drop Systems. Each system is explained below. The MagneGrip Exhaust Removal Systems offer the most advanced technology available for exhaust removal. Tested and proven in thousands of applications, the unique features of MagneGrip Exhaust Removal Systems make them the first choice among firefighters.

This type of system uses a hose and nozzle, a rail or track with a movable trolley or expandable flexhose, ductwork, and an exhaust fan to draw the vehicle exhaust emissions out of the firehouse. The nozzle connects to the vehicle exhaust pipe, making it the most effective way to eliminate hazardous diesel exhaust emissions “at the source.” When responding to an alarm, the system remains connected until the apparatus reaches the doorway, at which time the nozzle automatically releases.

This is an underbody, canister-type filter that manufacturers install on apparatus beginning with 2007 models, as mandated by the EPA. These filters can also be purchased for the older model apparatus. The filter’s primary purpose is to capture the particulate that is at its greatest concentration when a vehicle is started. The filters may also capture some gases, but underbody filtration technology is not capable of eliminating most of the toxic gases and fine particulate in diesel exhaust emissions.

These systems use a series of ceiling-mounted air filtration units in the bay area to pull in exhaust fumes and other pollutants. The systems are set to operate automatically. Contaminated air is drawn through a series of filters to trap particulates and gases, and then the cleaned air is dispersed back into the facility. The two primary types of air circulation patterns used in air cleaning devices are vertical and horizontal patterns. Vertical air circulation pulls in contaminated air at the base of each unit and sends filtered air out from the top. Horizontal air circulation pulls in contaminated air at one end of the unit and sends filtered air out the other end to create a continuous pattern of filtration. A photo-catalytic oxidizer can be used as the fourth stage of filtration in some air-cleaning devices for additional protection. The PCO contains ultraviolet lamps and a specially coated grid to neutralize toxic compounds such as carbon monoxide and nitrous oxide. The UV lamps kill airborne contaminants such as viruses, bacteria and mold spores. Other types of air filtration devices, such as ducted and portable units, may be used in other parts of a facility, such as turnout gear rooms, living quarters and offices.