A. Top hinged panels are the most commonly specified system. If they open, they will come to a near closed position once the internal and external pressure has equalized. In this near closed position, the canopy effect offers the facility protection from wind, rain, and snow. Whereas a bottom hinged panel will remain open at approximately 60 degrees from vertical, thus allowing easy entry of the elements.
Bottom hinged vents would most commonly be specified when panels are located at grade or at roof level where snow drifting might be a concern. It is much easier for a bottom-hinged panel to open downward on top of the drift than have a top hinged unit power through the snow.
Aluminum Panel ERP-IC FM approved and labeled. Designed in accordance with NFPA 68 standards and all fire codes. Insulated and well sealed to provide a draft free environment.
Translucent Polycarbonate Panel ERP-PC Designed in accordance with NFPA 68 standards and all building and fire codes. Translucent panels reduce need for artificial lighting.
Explosion Relief Louver ERL Provides explosion or pressure venting with the ability to handle every day exhaust and intake ventilation requirements.
Insulated Aluminum Panel XRV-IC XRV-IC roof explosion vents are for buildings where the exterior wall area is insufficient, or where exterior walls are obstructed, preventing wall vents.