External louvres, double deflection grilles, slot diffusers and square ceiling diffusers have different installation and air distribution characteristics. First establish the location, supply or return duty and design airflow.
External louvres require checks for rain exposure, wind direction, insect mesh, drainage and wall openings. Indoor air terminals should be selected with the ceiling layout, duct interfaces, effective area, airflow direction and acoustic requirements in mind.
Face size, neck size and opening size are not always the same. State which dimension you are using, together with the material, finish, mounting method and any plenum box or control accessories. Confirm the final details in drawings.
