About hvac system components
GRD means Grille, Sign-up and Diffuser. GRD indicates a part is both a grille, a sign-up or maybe a diffuser. It is a generic term applied to explain everything that’s source/return and exhaust/intake air.MFD stands for Motorized Fireplace Damper. MFD is a sort of damper which is each motorized and resistant to hearth. It takes advantage of an ac