Roof ventilation fans utilize the principle of natural air convection to accelerate and transform any parallel airflow into a vertical upward airflow, improving indoor ventilation. They require no electricity, operate silently, and can run continuously, removing heat, moisture, and stale air from indoor spaces. They have been popular in developed countries for decades, and in China, with the proliferation of steel-structured buildings, the installation and use of non-powered roof ventilation fans is also increasing.
Roof Ventilation Fan Introduction
1. The foundation for the roof ventilation fan installation must be higher than the roof surface, with a flat surface to prevent water seepage and leakage. Anchor bolts must be pre-embedded.
2. A 5mm rubber pad should be placed between the fan base and the foundation to reduce vibration. Anchor bolts should be equipped with spring washers to prevent loosening during use.
3. The diameter of the roof ventilator outlet pipe can only be increased, not decreased. An insect screen must be installed at the final outlet, and a rain cap must be added if the airflow is directed upwards. During winter snowfall or freezing periods, the ventilator must be operated frequently to prevent snow from clogging the outlet.
4. The roof ventilator and ductwork should be connected using flexible, non-combustible hoses. The hose length should not be less than 200mm, and the diameter should match the inlet and outlet dimensions of the roof ventilator. To ensure the hose does not twist or deform during system operation, it should be installed with appropriate tightness. For the canvas hose installed at the roof ventilator intake, it can be installed slightly tighter to prevent it from being sucked in during operation and to reduce the cross-sectional size of the canvas hose.
