Quote Originally Posted by LRAC View Post
Hello all
We have been called in by one of our food production customers to look at the possibilty of installing a Positive air pressure system within the food area.
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.