Section 1
• Exhaust fans need to run at whatever speed is required to match the CFM being introduced by the AMU (assuming the operator has set the controller for 0.000”w.c. balanced pressure) • When exhaust filters are new/clean, there is less restriction on the exhaust fan, therefore it doesn’t have to run at full speed to maintain the booth pressure. • As exhaust filters load, there is more restriction on the exhaust fan, therefore it needs to speed up to maintain booth pressure. • Pressure across the exhaust filters should be monitored so that as the filters reach their maximum loading, the operator knows to replace them. This pressure is monitored on the booth manometer. • If the filters are not changed, eventually the exhaust fan will be running at full capacity but the booth will no longer balance because there is too much restriction on the exhaust fan.
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