For tunnel-ventilated poultry houses, the 54 inch (1380 mm) exhaust fan is the usual choice because it moves the most air per fan and per wall opening. The 40 inch (1000 mm) and 32 inch (800 mm) fans suit smaller sheds, side-wall ventilation, minimum ventilation and other buildings.
The three sizes
| Size | mm | Airflow | Typical use |
|---|---|---|---|
| 32 inch | 800 mm | 18,000 m³/h | Small sheds, minimum ventilation, kitchens, workshops |
| 40 inch | 1000 mm | 23,000 m³/h | Medium sheds, greenhouses, godowns |
| 54 inch | 1380 mm | 44,000 m³/h | Tunnel-ventilated poultry houses, large factory sheds |
All of our drop hammer exhaust fans are made in India with six SS-304 stainless steel blades and a 1.2 mm body.
Why 54 inch is the poultry standard
- Fewer fans: one 54 inch fan moves almost as much air as two 40 inch fans.
- Fewer openings in the end wall.
- Fewer motors to wire and maintain.
When smaller fans make sense
- Small sheds where the end wall cannot fit enough 54 inch fans
- Minimum ventilation in cold weather, when a smaller fan running steadily is easier to control
- Side-wall ventilation in naturally ventilated sheds
- Buildings other than poultry, such as greenhouses, kitchens and workshops
What about 36 and 50 inch fans?
You will see 36 inch and 50 inch fans in the market too. We make 32, 40 and 54 inch. If a design calls for 36 inch fans, our 40 inch fan is the nearest, with more airflow; if it calls for 50 inch fans, the 54 inch moves more air per fan, so you may need fewer.
Working out the number of fans
Airflow needed = shed width × average height × target air speed × 3,600. Divide by the airflow of the fan size. For a 12 m × 3 m shed at 2.5 m/s you need about 324,000 m³/h: eight 54 inch fans, or fifteen 40 inch fans. Use our poultry fan calculator.
Belt drive or direct drive?
Both are available in every size. Direct drive has no belt to adjust or replace; belt drive is the traditional drop hammer design and runs on single or three phase. See direct drive vs pulley drive.
See poultry fans and the 54 inch exhaust fan.
Frequently asked questions
Which exhaust fan size is best for a poultry farm?
The 54 inch (1380 mm) fan for tunnel ventilation, because it moves about 44,000 m³/h per fan.
How many mm is a 54 inch exhaust fan?
1380 mm. 40 inch is 1000 mm and 32 inch is 800 mm.
Do you make 36 inch poultry fans?
We make 32, 40 and 54 inch. The 40 inch fan is the nearest to a 36 inch, with more airflow.