280 smoke damper fire damper and other nature is the same, only more sensitive to temperature. 280 damper usually was always open, smoke detector control center sent an electrical signal (DC24V) fire damper 70 ℃, motor-energizing action within the actuator, the valve automatically shut down, and shut down electrical output. After the valve actuation DC motor drive reset dampers, valves can be manually shut down or 70 ℃ melt following action closed damper 280, there is a six-speed valve to regulate air flow opening. Air Conditioning Accessories: aluminum outlet, aluminum shutters, off more Yefeng flow valves, dampers, smoke outlet, fire air, plate discharges, fan coil three-speed switch, fan coil thermostat, fans coil electric valves, new air unit coolers and the like; Fan categories: Wall fans, heaters, axial fans, centrifugal fans, mixed flow fan, Francis fan, wind chassis, etc; tank centrifugal fan works with turbine Almost compressors, which are not due to pressure changes, low gas flow rate, generally do not need to consider changes in hematocrit round damper gas, that gas as incompressible fluid handling. I believe that with the advancement of technology, all aspects of performance tank centrifugal fan will also be greatly improved, it works will be more advanced. Damper, rich ventilation equipment, 150 ℃ dampers provided by Dezhou rich ventilation plant. Damper, rich ventilation equipment, 150 ℃ damper Plumper Shandong Dezhou ventilation plant (www.frtfsb.com) (www.frtfsb.com) this year introduced a new upgrade, the above picture is for reference only, please call this page or Tel picture on to obtain the latest information, Contact: Zhang.