Before the installation of the ventilation duct, check whether the size, elevation and the position of the calibrated supports and hangers of the air duct through the floor and wall holes meet the requirements. The spacing between hangers is 3m. For pipes less than 3m long, one hanger shall be set at both ends. In order to prevent the cold bridge from adding skids between the air duct and the hanger, the thickness of the skids is the same as that of the insulation layer.
Each layer of vertical air duct shall have at least one support, and when the layer height is greater than 4m, there shall be at least two supports.
Before the installation of air duct, pre-assembly and inspection must be carried out before it can be installed in place according to the preparation sequence.
Before installing the air duct and parts, remove the dust and dirt inside and outside the pipe, seal both ends with polyethylene film, and keep the inside of the pipe clean. The packaged air duct and its components shall not be removed before installation.
Air duct supports and hangers shall avoid the installation of air vents, air valves, flanges, inspection doors and other components on wall openings or floors. Pads shall be set between the supports and hangers and the air duct.
The muffler shall be installed in the correct direction without damage and damp. The muffler shall be provided with a separate support to avoid the load bearing of the air duct.
Before the installation of the fire damper, check whether its model and position meet the design requirements, and whether there is a product certificate. The fusible piece of the fire damper should be installed in the direction of the airflow. To prevent the fusible piece from falling off, the fusible piece should be reinstalled after the installation of the system, and the action test should be conducted after the installation. In addition, the fire damper should be installed with a separate support.
Smoke exhaust valve, smoke outlet and manual control device (including embedded conduit) shall be installed according to design requirements. After the smoke exhaust valve is installed, conduct action test to check whether its manual operation and electric operation are sensitive and reliable, and whether the valve body is closed tightly.
For the inlet and exhaust fans, the composite aluminum foil flexible glass fiber hose is used for the connection between the inlet and outlet of the air conditioning air duct and the air duct. The length of the hose on the negative pressure side is 100mm, and the length of the hose on the positive pressure side is 150mm.
When installing the air outlet, ensure the tight and firm connection between the air outlet and the air duct; The frame of the air outlet is closely connected with the architectural decoration surface; The surface of the installed air outlet shall be smooth and flexible.
The prevention of vibration and noise during installation is a key point in the installation process. The prevention of vibration and noise during installation mainly starts from the following aspects:
In the air conditioning unit, install the flexible joint connected to the fan and air duct to achieve proper tightness, avoid noise and vibration caused by loose flexible joint, and reduce the area of air inlet and outlet.
Fix the support at the corner of each system air duct and the connection with the air conditioning equipment and the air outlet to prevent the air duct from vibration.