IS 3141:2018 is the Indian Standard (BIS) for centrifugal fans - specification. This standard specifies the design, construction, material, and performance requirements for centrifugal fans used in HVAC and industrial applications. It sets the baseline for aerodynamic testing, dynamic balancing, and acoustic limits to ensure efficient and reliable ventilation.
Specifies requirements for the design, construction, performance, and testing of centrifugal fans.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| Impeller Balance Quality | Grade G 6.3 as per IS 11723 (Part 1) / ISO 1940-1 for standard applications. | Recommends Grade G 6.3 as a typical value for most industrial fans, with other grades for specific duties. | ISO 14694:2003 |
| Vibration Severity (Assembled Fan) | Limits specified as per IS 14457 (Part 1) / ISO 10816-1, e.g., 2.8 mm/s RMS for rigid-support fans up to 15 kW. | Specifies limits based on fan type and support rigidity, e.g., 2.8 mm/s or 4.5 mm/s RMS are common acceptable levels. | ISO 14694:2003 |
| Aerodynamic Performance Test Method | As per IS 3588 (Methods of testing of industrial fans). | Performance testing using standardized airways. | ISO 5801:2017 |
| Efficiency Metric | Minimum Fan Motor Efficiency Grade (MFMEG), e.g., MFMEG50, MFMEG55. | Fan Efficiency Grade (FEG) or Fan Energy Index (FEI), with a minimum FEI of 1.00 in many regulated markets. | ISO 12759:2010 / ANSI/AMCA 205-16 |
| Acoustic Test Method Reference | Reference to IS 6451 (Sound power level determination). | Reference to ISO 13347 series, which in turn specifies methods from the ISO 3740 series (e.g., ISO 3744). | ISO 13347-2:2004 |
| Performance Tolerance (Power) | Absorbed power shall not exceed the rated value by more than 5% at the duty point. | For Class 2 tolerance, power input shall not exceed the rated value by more than 7% at the rated flow rate. | ISO 13348:2008 |