Automatic shut-off damper for insertion into the ductwork. Prevents the escape of warm room air and the entry of unwanted cold air when the fan is switched off. Automatic function in both negative and positive pressure operation (rotatable installation position) through spring closure. For horizontal flow, position the pivot axis vertically. For vertical flow, function only in rising air current. Casing made of galvanized steel sheet, flaps made of aluminum, return spring made of stainless steel.
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