Rectangular air doors (square air doors) are manufactured using CE technology. Mainly used for smoke and air ducts in thermal power plants, as a cut-off medium for interception. High working temperature: less than or equal to 420 degrees Celsius, high working pressure: 2000mmH2O, air leakage rate: less than or equal to 2%.

Rectangular air doors (square air doors) are produced according to the standard drawings of the Ministry of Water and Electricity's "74 Typical Design of Smoke, Air and Coal Powder Pipelines".

There are five types including single axis, double axis, three-axis, four axis, and five axis, and 66 product specifications including 300 * 400-2400 * 2000. According to the 4DD drawing numbers DD4201-DD4266.

The position of the air door can be arranged horizontally or vertically. The protruding part of the outer shell of the garden air door and the bearing neck of the front bearing of the square air door main shaft are used for installing the pot wheel box. Both the garden air door and the square air door are equipped with blocking nails when the baffle is fully opened.

The air door itself does not come with any transmission device and can be selected as needed. For the type and specifications of the transmission device, please refer to the "Transmission Device" section of the manual.

The transmission torque of the air door transmission device is divided into two types: 8 kg/m and 30 kg/m. Equipped with an 8 kg/m torque transmission device for a 17 * 17mm air door shaft and a 22mm worm gear box shaft. Equipped with a 30 kg/m torque transmission device for a 32 * 32mm air damper shaft and a 32mm worm gear box shaft.