... design, high efficiency, low wastage of energy, light weight, low noise, long duration and beautiful ... distortion and broken.2). Frame: Galvanized steel sheet, light weight, good appearance and easy to install.3). ... safety and fastness.4). Handles: designed as recessed type, easy for carry, transport and have no effect ... approx 15-30°. Technical parameters: Hanging Type Exhaust Fan for Cowhouse