This standard specifies the requirements for materials, construction, balancing, and performance testing of fans and blowers utilized in HVAC, ventilation, and industrial exhaust applications.
Specifies general requirements for the design, construction, performance, and testing of fans and blowers.
Quick Reference Values
Air volume delivery tolerance± 5% of rated capacity
Static pressure tolerance± 5% of rated pressure
Maximum power consumption tolerance+ 5% of rated power
Vibration limitsAs per IS 12065 depending on machine class
Key Formulas
Shaft Power (kW) = (Volume Flow Rate (m³/s) × Total Pressure (Pa)) / (1000 × Fan Efficiency)
Fan Law 1: Q1/Q2 = N1/N2 — Flow rate varies directly with speed
Fan Law 2: P1/P2 = (N1/N2)² — Pressure varies as square of speed
Practical Notes
Ensure the fan's operating point correctly intersects the system resistance curve to avoid issues like surging, stalling, or inefficient operation.
Dynamic balancing of the impeller is critical and must be strictly adhered to; poor balancing leads to premature bearing failure and excessive noise.
BIM models should include adequate clearance around the fan for maintenance access, specifically for motor and belt replacements.