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Chapter 7 Ventilation

7.1 Ventilation

Each booth should have its own dedicated exhaust stack.  Unfortunately combining two booth exhaust systems into one stack to save on roof penetrations will not work.  Each booth should have its own independent stack.  That stack should terminate in a vertical position 6’above the point of penetration and at least 30’ from any given property line.


Each exhaust plenum on a paint booth should have its own pressure gauge called a manometer.  Most manufacturers’ supply the manometer with the purchased paint booth package.  If they charge this on a separate line item I would be skeptical.  The manometer is going to help you know when your filters are getting dirty because you will see the gauge move.  It moves based on pressure.  The pressure builds up as the filters get dirty.


Right above the exhaust fan should be an access door.  It’s required by code so that the fan can be serviced.  Keeping the fan clean helps to extend its life.  Also, you should have access doors at each bend in the duct for service.


As the paint booth exhausts the air it will need to have fresh make up air supplied in some fashion.  You can do this with a louver, an open door or a heated make up air system.  The louver in the building ceiling or wall should be relatively close to the location of the paint booth.  Keep in mind with a louver system you are pulling ambient air into the building.  If it’s cold air sometimes it’s best to have it travel a short distance so as not to freeze everyone in the shop.  A solenoid on a door simply interlocks the booth with an open door.  If the door isn’t open enough to allow for ample make up air then the booth simply will not work.  Open the door enough to trip the switch and now the booth can run.


Also remember to space your intake air source from your exhaust source by at least 10’.