70 degrees electric damper choice points: 1. damper main control parameters for the selection and specification. 2. damper suitable for ventilation and air conditioning systems, in addition to public buildings, kitchen hood system with dampers, operating temperature of 150 ℃, the general ventilation and air conditioning systems with fire dampers operating temperature of 70 ℃. 3. The damper is suitable for pipe ventilation, air conditioning or exhaust system, the scope and application of the basic functions in Table 1. 4. The selection of valve should pay attention to the function of the valve, normally open or normally closed, shut down automatically open, close the open hand, manual reset, signal output, remote control and other requirements. 5. If the valve and fan interaction should be used with double micro-switch device. 6. The valve should be steel blade thickness of 2 ~ 6mm, the body of non-combustible material, rotating parts should be corrosion-resistant metallic materials, and flexible rotation. Shall not be less than the thickness of the valve housing 2mm. Yi Rong parts shall comply with recognized standards of the fire department. Texas timeless air conditioning and ventilation equipment factory is a private enterprise. Specializing in the development of central air conditioning terminal equipment, development. Is a manufacturing, sales, installation and service in one. Its products are mainly for central air conditioning and ventilation cooling, pharmaceutical chemicals, building shopping malls, metallurgy miners, textile and environmental protection and other fields, has established partnerships with a number of related businesses. The company's main products are fan series: axial fans, roof fans, mixed flow fan, Francis fan, and a variety of exhaust fan; FRP ventilation, variable air volume air box, Francis wind chassis, exhaust air box, etc; outlet Series: Double Grille, single Grille, since the vertical blinds, swirl diffusers, egg cell outlet, casual flow circular, rectangular and other casual flow; valve series: fire dampers, smoke valves, exhaust fire valve, regulating valve; duct series: a total of flange duct, fiberglass duct inorganic, organic fiberglass duct, etc; air conditioning series. www.dzyhtf.com/