 |
|
Ask the Expert Question-and-Answer Archive by Ron Joseph October, 2005 Changing Filters in Spray Room Based on Pressure Differential Q. We just installed a paint booth at our facility. There is a pressure gauge installed across the filters. Is there a relationship between the air velocity and the pressure in could use to determine when the filters needed to be cleaned A. The manometer on the side of a paint spray room measures the pressure differential
across the exhaust filters. Regardless how plugged the filters are with overspray,
the faster the air flow the higher the differential. OSHA recommends that we
have an air velocity of 100 fpm in most spray rooms. To determine when you should
change your filters I suggest that you measure the differential when the filters
are new and when the velocity is >100 fpm. Then monitor the differential
over time while the filters load up with overspray. Frequently measure the air
velocity through the spray room. When the velocity falls below 100 fpm, record
the pressure differential and use this value as your baseline for changing the
filters.
|