Section 1
Balancing Balancing is accomplished using a Variable Frequency Drive (VFD) on the supply fan (AMU) and the exhaust fan. Using the VFDs allows the fans to turn at variable speed which translates to variable Cubic Feet per Minute (CFM). • Booths are designed to operate with a specific Feet Per Minute (FPM) in mind. • The FPM will vary by booth type.
• During commissioning, the AMU fan speed is set to achieve the desired FPM through the booth. • The AMU fan speed should not change during spray mode, so the same volume of air is continuously being introduced into the booth. • The exhaust fan speed will need to change during normal operation.
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