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Thread: Positive air pressure system
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27-11-2006, 01:24 PM #5
Re: Positive air pressure system
Positive pressure system is just making sure that the supply air is a little more than the exhaust air leaving a certain space. If there are a lot of doors and exhaust fans that are being put on & off, the supply air volume should vary.
Varying the supply air could be accomplished by adding a pressure sensor in the room that varies the supply fan speed thru a VFD or using multiple motor speeds.
For food production areas, some facility requires a filtered air and customer sometimes require a Hepa filter. Fresh air supply air also varies depending on the required volume per person, equipment requirement, etc.
The customer should realize that a positive pressure system will incur additional energy cost.