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¢X F to a smooth, hard continuous finish.

The blade force necessarily has an additional component in the tangential direction, providing the reaction to the driving torque: this sets the air spinning about the axis independently of its forward motion. As compared to curved sheet blades, aerofoils can apply greater force to the air, thereby increasing maximum pressure and can maintain better efficiency over a wider range of volumetric flow. Also by increasing the thickness & curvature of the inner sections, the blades can be made stiffer, this limits flutter and allows the impellers to be run at higher speeds. Selection of a right fan one should consider such factors like cost optimization, power rating & noise levels govern the selection of a fan suitable for a given application. Various combinations are possible to meet any given duty or operating requirements for best performance, lesser noise, power and cost characteristics. Once the volume of airflow and the static pressure of the system are known, it is possible to specify a fan. The governing principle in fan selection is that any given fan can only deliver one flow at one pressure in a given system. To select a fan one must consider the following parameters: total airflow required,  total operating pressure,  fan installation space.