As of January 2016, all new equipment above 65,000 Btus must include two-speed fans. Without a consistent balancing protocol, the difference in resulting balance reports would be impossible to follow or interpret.
Bonus Whitepaper: Testing and Air Balancing Constant- and Variable-Volume HVAC Systems
Bonus Whitepaper: Testing and Air Balancing Constant- and Variable-Volume HVAC Systems
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