Back in 2012, the National Environmental Balancing Bureau (NEBB) published top ten reasons building HVAC systems do not perform as intended. Here’s a reprint of the ten issues according to NEBB:
Issue #1: Ductwork is not reinforced for the proper SMACNA pressure classifications.
Issue #2: Failure to adequately seal ducts.
Issue #3: Failure to understand the need to seal return and exhaust ducts.
Issue #4: Failure to adequately pressure test ductwork to prove that duct sealing is effective.
Issue #5: Failure to understand SMACNA […]