hvac system types for Dummies
GRD means Grille, Sign up and Diffuser. GRD signifies a element is possibly a grille, a sign-up or even a diffuser. It is a generic term used to explain anything that’s offer/return and exhaust/intake air.HRV means Warmth Recover Ventilator. HRV is usually a warmth Restoration devices that often transfer the warmth within the incoming outside air