Domestic fresh air is a systematic project, and not only the product selection and design should be strictly controlled, but also the matters needing attention in the installation of domestic fresh air system should not be ignored. Generally speaking, the domestic fresh air system generally consists of three parts: the main engine (or unit), the ventilation duct and the air inlet and outlet, and these three parts are also the most important in the installation process.

1 Precautions for installation of the main engine

1. According to the overall dimensions of the ventilation main engine, make the fixed frame of the ventilation main engine, and carry out rust prevention treatment;

2. Install the main engine horizontally on the top of the house, as close as possible to the hall connected with the air intake;

3. When the main ventilation machine is fixed to the fixed frame, rubber shock-proof blocks are used in the middle for shock absorption. Calibrate the fixed frame of ventilation main machine horizontally without distortion.

4. Sufficient space should be left near the installation position of the ventilation main engine to facilitate maintenance; When the domestic fresh air main machine is installed in the ceiling, there should be an access opening not less than 451×451 near it, and the reserved position of the access opening should be convenient for maintenance, with no shelter above it;

5. configure the power cord according to the motor power and voltage of the ventilation host. Power supply should be independent, wiring should be correct, solid and well grounded; The power cord shall be well insulated and shall not be exposed; The ventilation host should have an independent control device;

6. The air duct adopts UPVC pipe. When the tuyere connected by hose is adopted, the hose length should not exceed 51cm.

7. The length of hose used for exhaust duct should not exceed 5M, and UPVC duct should be used if it exceeds 5M.

2 Precautions for installation of ventilation pipes

1. The direction of pipes, pipe diameter and installation position of tuyeres should meet the requirements of design drawings;

2. The cutting opening of the pipe should be smooth and free of burrs. The joints of pipes and fittings should be riveted or bonded firmly, and no residual glue is left on the pipes or fittings;

3. The pipeline shall be installed horizontally and vertically. The inner diameter of the pipe is clean and free of sundries;

4. PVC pipes should be fixed with supports and hangers. If hoop is used, its inner surface should be close to the outer wall of the pipe. Brackets and pipes should be fixed firmly without looseness;

5. All the wall holes through which the pipeline passes shall be drilled by mechanical punching machine, and it is forbidden to change the aperture and position without permission;

6. The spacing of air duct supports and hangers;

7. The length of flexible metal or nonmetal air duct should not exceed 5m, and there should be no dead bending and collapse;

8. The connection between tuyere and air duct should be tight and firm; The frame is closely attached to the building facing, and the outer surface is flat and undistorted. The installation height of tuyeres in the same hall and room should be consistent and arranged neatly.

9. During the pipeline installation, it is forbidden to directly change the diameter at the equipment outlet, and the diameter should be gradually changed according to the room layout. The disadvantage of changing the diameter is that the air volume decreases and the noise increases. Remember this one!

3 Precautions for air inlet installation

1. The air inlet must be filled and sealed with foaming agent and waterproof;

2. When installing the air outlet, select the opening near the main engine and communicating with the outdoor, install the wall bridge, and seal it with foaming agent. The wall bridge should be flush with the external wall. PEF tape is used as the intermediate transition at the junction between the rain-proof air outlet and the wall bridge, and the installation of the air outlet should be correct, flat, tight and beautiful;

3. The air inlet of the kitchen room should be far away from the stove, the outdoor air inlet and exhaust outlet of the equipment, and away from the exhaust outlet of the range hood and the smoke outlet of the wall-hung boiler;

4. It is not recommended to make air supply and exhaust outlets in the bathroom;

5. The air inlet should be located in a place with clean outdoor air;

6. The pipeline material adopts the construction method of combining PVC pipe with composite hose.