What are the key specifications and precautions for installing ventilation equipment?

The key specifications and precautions for installing ventilation equipment include:

Before installation, it is necessary to check whether the equipment model, size, and design drawings are consistent to ensure that the foundation flatness error does not exceed ± 5mm. Flexible shock-absorbing joints should be set up when connecting the fan and the air duct to avoid vibration transmission caused by rigid connections; When hoisting air ducts, the spacing between brackets should comply with the specifications (usually the spacing between horizontal installation brackets for galvanized steel ducts should be ≤ 3m, and vertical installation should be ≤ 2m), and anti sway brackets should be installed. For explosion-proof ventilation equipment, the junction box must be strictly sealed, the wires must be threaded through galvanized steel pipes, and the grounding resistance should be ≤ 4 Ω. In addition, the clearance between the fan impeller and the casing needs to be adjusted according to the manufacturer's instructions. The radial clearance of centrifugal fans is generally 0.5% -1% of the impeller diameter, and the clearance between axial flow fan blades and the air duct is ≤ 5mm to ensure operational efficiency.