Roof Vents and Wall Grilles

Wall grilles can be used for the intake and exhaust and it is important to use a grille (or roof vent) of sufficient size so that the air flow to and from the HR unit is not restricted. If you are unsure then please ask CVC Direct for help in specifying the correct size of wall grille. 

PLEASE NOTE. Where a wall grille is situated in an exposed position and possibly subject to high winds and/or driving rain, a cowled wall vent is preferred to prevent ingress of rain.

When using a louvred wall vent, it is preferrable to use a vent grille which is a size larger than the ducting to which it is attached, as the louvres can restrict airflow significantly and contribute to higher duct pressures.