Roof Fans
A roof fan is a mechanical ventilation device specifically designed for mounting on the rooftops of buildings. These fans typically contain a weatherproof housing to protect their internal components from environmental elements while facilitating the exhaust or supply of air directly to or from the atmosphere. Roof fans operate by drawing air from inside the building and expelling it outwards, or by drawing fresh air in, utilizing a motor-driven impeller (which can be either axial or centrifugal in design, depending on the specific model and required static pressure).The primary function of a roof fan is to provide effective ventilation for commercial, industrial, or sometimes large residential spaces, removing stale air, heat, moisture, and pollutants. They create a negative pressure within the building to exhaust air, often operating as part of a larger HVAC system or as standalone exhaust units. Due to their external placement, roof fans are engineered for durability and often include features like bird screens, backdraft dampers, and robust materials to withstand varying weather conditions. Their installation on the roof allows for efficient vertical air discharge, minimizing re-entrainment of exhausted air and optimizing space within the building's interior.