The Definitive Guide to hvac system design
GRD stands for Grille, Sign up and Diffuser. GRD suggests a part is possibly a grille, a sign up or maybe a diffuser. It's really a generic term applied to explain something that’s supply/return and exhaust/intake air.BDD stands for Backdraft Damper. BDD is utilised to make sure air flows in one way. It prohibit air from flowing while in the reve