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Underfloor vehicle exhaust extraction for heavy duty vehicles

Underfloor vehicle exhaust extraction for heavy duty vehicles

Underfloor vehicle exhaust extraction for heavy duty vehicles

I am required to specify  the underfloor vehicle exhaust extraction system.The system serves 16 floor outlets for heavy duty vehicles as Trucks,Cranes,snow movers.I have designed the system for 100% duty with each outlet @600 cfm.The fan is 9600 cfm at 4 inch static pressure.A bypass damper  would modulate  based on the duct static pressure to maintain flow for the fan.This helps the  variable speed general exhaust for the shop which can modulate to save energy.
I want to get your feed back on the the following:
the most suitable duct material for underfloor ducting :PVC or ceremic tiled pipe or Galvanized duct encased in concrete?I prefer to go with concrete encased Galvanized steel duct due to heavy vehicles.And for the above ground duct is this got be welded galvanized steel duct ?
Further is a true infloor or disappearing  system available for 6 inch hose to tail pipe.I am told by supplier that disappearing  system is available for 4 inch hose.Did any one use disappearing  system for 6 inch hoses ?

RE: Underfloor vehicle exhaust extraction for heavy duty vehicles

I would do 50% diversity. Take a look at the existing facility, I bet you will not find more than 4 bays out of 16 requiring exhaust. 6" is correct 600 CFM is ok. A VFD based upon sp is the best application. Most of the time I let the fan ride the curve and have not have had problems with fan life. I use schedule 80 PVC and Harvey tailpipe units. We cover the lateral takeoff with concrete. I have not had problems with movement. I use PCV due to the shops use tons of water to clean the floor. I slope the main down towards the riser and build a PCV plenum with a sump pump at the bottom. As soon as the main duct rises past the floor elevation, I switch to spiral duct and place the utility set on the roof or just below the roof. Excavation, elevation, slope and the concrete contractor are the keys. Be very carful of the elevations. http://www.harveyexhaust.com/Products/In-Grd.htm


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