About hvac system cleaning
GRD stands for Grille, Sign up and Diffuser. GRD signifies a part is possibly a grille, a sign-up or simply a diffuser. It is just a generic expression applied to explain nearly anything that’s source/return and exhaust/ingestion air.EAD means Exhaust Air Duct. EAD is commonly located in duct layout drawings, especially for the air flow system. A