Ventilation and gas-freeing

Ventilation and gas-freeing

• Ventilation duct in- and outlets are to be fitted with protective screens with a mesh size not exceeding 13 mm.
• Overheating of the mechanical components of fans and the creation of sparks is to be avoided by appropriate design and by the choice of suitable materials.
• The safety clearance between the fan housing and the impeller shall not be less than 1/10 of the inner impeller bearing diameter, limited to a minimum of 2 mm and is to be such as to preclude any contact
• between the housing and the rotor.
• The maximum clearance need not to be more than 13 mm.
• The above requirement also applies to portable fans.
• Electric motors are to be located outside the vent ducts.