Title: Instructions manual - THGT fan.pdf
6.5 The impeller and blades should be regularly checked for damage that could cause imbalance in the moving parts.6.6 Any sensors or control systems fitted for temperature, vibration, bearing condition etc, must be regularly checked to ensure safeoperation.6.7For ATEX impeller clearance “S” between fixed and rotating parts must be inspected to ensure compliance with minimum values measured in Pre-Start checklist. In absence of any specific data this should be a minimum of 1% of the impeller diameter “D” and never less than 2mm or more than 20mm, in radial or axial directions. Warning for ATEX: This running clearance “S” between impeller “D” and duct / case or inlet cone is critical for safe fan operation. See Annex 5: Typical running clearance for axial fans:-6.8 Local regulations may prescribe frequency of checking Fans, especially Emergency Ventilation dual purpose (S1+S2) and dedicatedEmergency Ventilation Fans, however, typical checks would be:-Typical one (1) month check:-