Livestock house ventilation: sizing an axial fan to static pressure
Livestock equipment in this section centres on pig-house ventilation, with a maker that also covers feeding, pens and farrowing, environmental control and manure handling. Ventilation is the place to start, because fan count and placement follow from the building's air needs and shape the rest of the house layout.
The Xinda 710 axial fan is a direct-drive unit running on 380 V. Xinda rates it at four static pressures: at least 16,500 m³/h at 0 Pa, 15,800 at 25 Pa, 15,100 at 50 Pa and 12,000 at 120 Pa. Efficiency falls across the same range, from 14 m³/h/W at 0 Pa to 9.5 m³/h/W at 120 Pa. The drawing gives a 710 mm upper span, a 760 mm lower overall span and a 380 mm side depth, which sets the wall opening. Output power is printed as 1.1–4 kW, so ask which motor the quote carries.
To size a barn, work out the airflow the house needs and the static pressure the fans will face once inlets, shutters and any other fittings in the air path are in place. Read the 710's airflow at that pressure, not at 0 Pa, and divide the house requirement by it to get a fan count. The efficiency column then lets you estimate running cost at your actual operating point rather than the best case.
The table also tells you how the fan behaves as resistance rises. Between 0 and 50 Pa the rated airflow drops only from 16,500 to 15,100 m³/h, but at 120 Pa it falls to 12,000 m³/h and efficiency to 9.5 m³/h/W. A house designed with generous inlets keeps the fans in the flatter part of that range, so fewer units do the same work and each one draws less power per cubic metre moved. If your building will run at the high-pressure end, plan the fan count from the 120 Pa row and confirm with Xinda which motor holds that duty.
Shaoxing Xinda Farm & Livestock Machinery plans pig farms, builds and installs equipment and provides after-sales service from Shangyu. If you buy single fans, send the wall drawings and your design static pressure. If you buy a full project, agree in writing who designs, supplies, installs and commissions each system, including fan controls, shutters, guards and wiring.
Prepare a category-specific sourcing brief · Read procurement guides
Compare the right fields
| Selection field | What to establish |
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| Ventilation duty | Required airflow for the house, from stocking, heat and humidity load |
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| Design static pressure | The pressure the fans work against with inlets, shutters and pads installed |
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| Fan operating point | Airflow and efficiency at that static pressure, read from the maker's table |
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| Motor and electrics | Motor rating within the printed range, supply voltage and control method |
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| Mounting | Wall opening from the drawing dimensions, shutters, guards and fixings |
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| Project scope | Who designs, supplies, installs and commissions fans, controls and wiring |
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Read competing quotations on the same basis
Compare fan quotations at the same static pressure as your design, using airflow and efficiency at that point rather than the 0 Pa figure. Ask each maker to name the motor rating it is quoting, and price shutters, guards, controls and mounting parts as clear lines. For a full house or farm project, compare offers on a written scope that assigns design, supply, installation and commissioning of each system.
Questions for your supplier
- Which motor rating within the printed range is fitted to the quoted 710 fan?
- What airflow and efficiency does the fan deliver at our design static pressure?
- Which shutters, guards, controls and mounting parts are included, and can you send the mounting drawing?
- For a full project, who designs, installs and commissions each system?
Send these questions with your enquiry and ask for the model-specific documents in the quotation.