Negative Pressure Ventilation Systems

Negative pressure ventilation system is a ventilation method that mechanically forms negative pressure inside the space, thereby driving the natural flow of fresh air from the outside and removing the dirty air from the inside. It is widely used in livestock and poultry farming, industrial plants, greenhouses and other places that need efficient gas exchange.

Exhaust equipment: The core is a fan (mostly axial fan, push-pull fan, etc.), which is centrally installed on one side of the space (such as the end of the chicken coop or side wall), and through continuous exhaustion, the indoor air pressure is lower than the outside, forming negative pressure.

Input device: It is usually an inlet on the other side (such as blinds, winding windows). When negative pressure is formed in the room, fresh air from the outside enters the room naturally through the inlet device under the effect of the difference in air pressure.

Control system: Some systems are equipped with temperature, humidity, ammonia and other sensors and controllers, which can automatically stop the fan and adjust the ventilation strength according to the indoor environmental parameters (such as excessive temperature and excessive ammonia).

After the fan is activated, it continues to drain the air outside, reducing the total amount of indoor air and reducing the air pressure (i.e. "negative pressure"); At this time, the outdoor air pressure is higher than indoor air pressure, and fresh air will flow automatically into the room through the preset air intake device.Fill the air gap, and at the same time expel indoor heat, moisture, and harmful gases (such as ammonia, dust) with the exhaust wind, forming a "new outdoor wind inflow → indoor turbid gas emission" cycle.

• High ventilation efficiency: The air flow direction is stable (it flows in a straight line or directly from the inlet to the outlet), which can quickly replace indoor air and reduce the ventilation dead corners.
• Low energy consumption: Mainly driven by a fan, new air is delivered without additional power, which is more energy efficient than positive pressure ventilation.
• The temperature control effect is good: When used with a wet curtain (such as a summer chicken coop), outdoor air enters the room after it is cooled by the wet curtain, which can quickly reduce the room temperature and enhance the cooling efficiency.
• Installation flexible: The fans and inlets can be arranged reasonably according to the space layout, suitable for long stripes or large areas (such as large-scale chicken coops, workshops).

Livestock and poultry breeding: such as broiler houses, pig farms, through the negative pressure ventilation rapid discharge of ammonia, fecal odor, the introduction of fresh air, while with the temperature control system to adjust the temperature, reduce respiratory tract disease.

• Industrial plants: used to remove dust, heat and exhaust gases in the workshop to ensure the safety of the working environment for workers.
• Greenhouse shed: During the high temperature season, negative pressure ventilation removes hot and moist air from the shed, introduces cool air from the outside, and adjusts the crop growth environment.

Its core advantage is that it can utilize air pressure difference to achieve efficient and directed air exchange, and it is low cost, easy to associate with other environmental control systems (such as cooling and odour removal systems), and is a common solution for large-scale site ventilation.

Qingzhou Ruixin Agriculture and Livestock Machinery Co., Ltd. is a trusted manufacturer of advanced poultry equipment that integrates innovation and practical application. Our products are supported by rigorous research and development and practical testing, ensuring the reliability of our customers worldwide.

Email: ruixinfarming@163.com

Phone: 18663682003

Hot Tags: negative pressure ventilation systems, China negative pressure ventilation systems manufacturers, suppliers, factory