These Natural Louvred Ventilators are weatherproof and give good air circulation. For matching adjustable ventilators, see 3-series. This is suitable for natural day to day and smoke control ventilation. Devi Enterprises offers Natural Louvred Ventilators in metal sheet viz PPGI, Galvalume and Mill Finish Aluminum Natural Louvred Ventilators manufactured from aluminium with a returned rim, surface mounted. Natural Louvred Ventilators are delivered fully assembled to site and may be installed at any angle from the horizontal to the vertical. It has a wide range of base profiles to suit all sheeting, curb or glazing applications. Bases are customized to suit the installation into either curtain walling, glazing or prepared openings.