Negative Pressure Exhaust Fans
What negative pressure means in practice
A negative pressure fan exhausts air from a space faster than air leaks back in, so fresh air is drawn in through planned openings — typically cooling pads or inlets — and travels across the space before leaving through the fan. That is why this family is paired with cooling pads in poultry and livestock housing: the fan creates the pull, and the pad cools the incoming air. The company's own pages describe the same pairing for farms, factories, and greenhouses.
Models in this family
- Butterfly cone exhaust fan — full specification table on its own page (DH(D)-1380A/B)
- Heavy-hammer exhaust fan — galvanised frame, aluminium blades, automatic louvers, as listed on the homepage
- Push-pull exhaust fan and T-style direct-driven exhaust fan — names as listed on the product index; confirm specifications before ordering
- Fibreglass belt-drive nylon cone fan — listed on Global Sources under this company, with a PMAC motor and shutter options
For a poultry or livestock house, the question to settle first is not the fan brand but the air path: where air enters, what it passes through, and where the fans sit. A fan placed without an inlet plan will short-circuit air near the wall and leave the far end of the house hot. Send the house length, width, and inlet arrangement with your inquiry.
Before ordering, confirm: the exact model and voltage for your site, the airflow and size you need, MOQ, lead time, and warranty. This page lists only what the source material verifies; anything not listed here is a question to ask, not a specification to assume.
Request a ventilation and cooling layout
Send your space size, heat source, and voltage, and ask for a layout using the equipment families on this page. Before payment, confirm MOQ, lead time, voltage, and warranty for your order.