Duct installation announcements

There are several things to note when installing the duct

General regulations

1. Air ducts and air treatment rooms, laying wires, cables and pipes for transporting toxic, flammable, explosive gases or liquids.

2. The detachable interface and adjustment mechanism (wind valve and automatic control device) of the air duct and accessories shall not be installed in the wall or floor to avoid affecting operation and maintenance.

3. Before installing the air duct and components, remove the internal and external debris and dirt and keep them clean.

Technical regulations for duct installation

1. The configuration of the field duct interface shall not reduce its effective section. This refers to the connecting pipe between the duct and the fittings, parts and equipment.

2. Hangers shall not be installed at the tuyere, damper, inspection door and automatic control mechanism. The hanger should not be directly fixed on the flange to avoid deformation of the duct and affect maintenance.

3. Flange material and thickness selection

a. For air ducts with air temperature below 70 °C, should use rubber sheets, closed-cell sponge rubber sheets, sealing tapes or other closed-cell elastic materials;

b. For air ducts with air temperature higher than 70 °C, should use asbestos rubber sheets;

c. The air duct with corrosive medium gas should be use acid-resistant rubber sheet or soft polyvinyl chloride sheet;

d. The air duct with conveying condensed water or humid air containing steam shall be use rubber plate or closed-cell sponge rubber sheet;

e. The thickness of the flange gasket should be 3~5mm. If without flange gasket, the thickness should be 4-5mm. The bolts connecting the flange should be screw up to meet the sealing requirements. The connecting bolts and nuts should be on the same side.

4. When the air duct and components pass through the wall or roof, should set rain cover. When the air duct passing through the roof exceeds 1.5m, the cable should be pulled. The cable should be galvanized or wire rope, it can’t fixed on the air duct flange and strictly forbidden to pull on the lightning rod or lightning protection net.

5. The installation of flexible short tubes should be Simultaneous loose-tight properties and can’t twist. The length of the flexible metal or non-metal soft air duct should not exceed 2m, and can’t have bends or collapses.

6. The branches and hangers of the insulated air ducts should be located outside and can not damage the insulation layer.