5 Essential Elements For hvac system meaning
GRD means Grille, Sign up and Diffuser. GRD signifies a part is both a grille, a sign up or even a diffuser. This is a generic phrase made use of to explain anything that’s source/return and exhaust/ingestion air.BDD stands for Backdraft Damper. BDD is made use of to be sure air flows in a single course. It prohibit air from flowing from the reve