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GRD means Grille, Sign up and Diffuser. GRD suggests a part is both a grille, a sign up or a diffuser. It is just a generic term utilized to explain something that’s source/return and exhaust/ingestion air.MFD stands for Motorized Hearth Damper. MFD is really a form of damper that is definitely the two motorized and immune to fireplace. It employ