Type SASD/SAED Axial Roof Ventilator

APPLICATIONS: The SASD/SAED is a low silhouette axial propeller roof ventilator that is compatible with modern architectural lines and also matches ILG¡¦s centrifugal power roof ventilators. Units provide general supply (SASD) or exhaust (SAED) of low, medium or high air volumes in commercial, institutional and light manufacturing buildings.

CONSTRUCTION:Round spun aluminum hood, Heavy gauge hood supports, Vibration isolators, Galvanized wire bird screen. Spun axial roof ventilators shall have circular hoods of spun aluminum. Ventilators will be low in silhouette to conform to present architectural styles. Square bases will be constructed of aluminum. Ventilators will be equipped with galvanized mesh bird screen. ƒnWeatherproof heavy duty aluminum housing resists corrosion and maintains appearance. Deep-spun, one-piece venturi improves efficiency and minimizes pressure losses. ƒnBird screen prevents entry of birds or other potentially damaging objects.

OPTIONS & ACCESSORIES: Prefabricated Insulated roof curbs with weather-resistant continuous welded construction are available for convenience in installation for both insulated and non-insulated roof decks. Backdraft Dampers of Gravity or motor operated type, constructed out of aluminum and designed for installation in prefabricated roof curbs. Protective Coatings: special protective coatings are available where units may be exposed to corrosive exterior conditions. Parts requiring painting are processed through the American Coolair fivestage pretreatment system prior to the application of any coatings to insure maximum finish adhesion. These parts use a thermosetting epoxy powder paint with an average thickness of 3 mils and baked at 400 F to a smooth, hard continuous finish.

The fan efficiency is defined as the ratio of air power (output) to shaft power requirement (input). An optimally designed fan impeller with improved aerodynamics requires less shaft input power for desired delivery of air volume with total pressure rise as per the system requirement. With reduced shaft power requirement, there is a commensurate reduction in energy consumption.

The fan efficiency is defined as the ratio of air power (output) to shaft power requirement (input). An optimally designed fan impeller with improved aerodynamics requires less shaft input power for desired delivery of air volume with total pressure rise as per the system requirement. With reduced shaft power requirement, there is a commensurate reduction in energy consumption. Thus the fan efficiency is directly contingent upon selection of fan and the operating point relevant to the system resistance. The way fan impellers (blades or rotors) are designed, the amount of air they can move decreases as the pressure they are working against increases. The airflow vs. pressure information for a particular fan is called the fan performance data. The performance of a fan depends on the size, shape & speed of the impeller. The fan performance data is essential for selecting fans as per the desired airflow and system pressure.