{"id":9140,"date":"2026-04-15T02:39:56","date_gmt":"2026-04-15T02:39:56","guid":{"rendered":"https:\/\/www.poultech.com\/?p=9140"},"modified":"2026-04-13T02:45:43","modified_gmt":"2026-04-13T02:45:43","slug":"how-to-maintain-chicken-house-temperature-using-negative-pressure-ventilation","status":"publish","type":"post","link":"https:\/\/www.poultech.com\/fr\/how-to-maintain-chicken-house-temperature-using-negative-pressure-ventilation\/","title":{"rendered":"How to maintain chicken house temperature using negative pressure ventilation?"},"content":{"rendered":"
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\nWhat is Negative Pressure Ventilation? <\/span>\n <\/h4>\n\n <\/div>\n<\/div>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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A negative pressure ventilation system uses exhaust fans to draw stale air out of the chicken house, creating a pressure difference between the inside and outside. This forces fresh air to flow in evenly through controlled air inlets on the side walls or roof. The key is that the inlet design allows cool air to move along the ceiling, absorbing heat from heaters, stoves, and the chickens themselves before reaching their activity area, thus becoming warm and dry.<\/p>

This “preheating before landing” path avoids cold air blowing directly on the chickens, ensuring air exchange while maintaining a stable temperature.<\/p>\t<\/div>\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\nMeasuring Negative Pressure: Understanding \"Inches of Water\" <\/span>\n <\/h4>\n\n <\/div>\n<\/div>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Negative pressure levels are typically measured in “inches of water” (inH\u2082O). For example, a negative pressure of 0.10 inches of water in a chicken house means that if a pipe is run from inside the house to a cup of water outside, the water will rise 0.10 inches.<\/p>

Interestingly, the negative pressure generated by exhaust fans is uniform throughout the chicken house; the value is the same regardless of the measurement point. Moreover, this artificial negative pressure is extremely small\u2014normal atmospheric pressure can vary by up to 27 inches of water, while the negative pressure during periods of minimal ventilation is only 0.08\u20130.12 inches of water, less than 0.04% of the natural atmospheric pressure fluctuations, and therefore does not cause stress to the flock.<\/p>\t<\/div>\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\nThe Relationship Between Negative Pressure and Inlet Size <\/span>\n <\/h4>\n\n <\/div>\n<\/div>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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In minimum ventilation mode, the level of negative pressure depends on the match between the exhaust volume and the inlet area:<\/p>

Larger inlet \u2192 Lower negative pressure<\/p>

Smaller inlet \u2192 Higher negative pressure<\/p>

For example, two 36-inch fans with a 20-square-foot inlet result in a negative pressure of approximately 0.15 inches of water column; if the inlet is increased to 40 square feet, the negative pressure drops to approximately 0.04 inches of water column.<\/p>\t<\/div>\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\nHow to Maximize the Warmth of Incoming Air? <\/span>\n <\/h4>\n\n <\/div>\n<\/div>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The key lies in negative pressure and the opening of the air inlet.<\/strong><\/p>

The level of negative pressure directly determines the speed at which air enters the chicken coop:<\/p>

0.05 inches of water column \u2192 wind speed approximately 900 feet per minute<\/p>

0.10 inches of water column \u2192 wind speed approximately 1250 feet per minute<\/p>

The faster the air enters, the longer it stays along the ceiling, thus absorbing more heat before descending. Increasing the static pressure from 0.05 to 0.10 inches (keeping the air inlet opening constant) can increase the distance the cool air travels along the ceiling by 30%\u201340%.<\/p>

However, negative pressure is not the only factor. The size of the air inlet opening is equally important:<\/p>

The larger the opening \u2192 the greater the airflow \u2192 the farther it travels along the ceiling<\/p>

Theoretically, at a static pressure of 0.10 inches, increasing the opening from 1 inch to 2 inches could further increase the propagation distance by 20%\u201330%.<\/p>

However, managers often face a dilemma: increasing the opening lowers the static pressure, thus reducing the wind speed. Therefore, simply reducing the opening to increase static pressure may not be effective. A smarter approach is to close half of the air intake in cold weather, while maintaining a larger opening (e.g., 2 inches) and increasing static pressure. This maintains high wind speeds and ensures sufficient airflow, preventing cold air from reaching the ground too early and causing localized cold stress.<\/p>\t<\/div>\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\nThe Impact of Temperature Difference: A Key Variable Overlooked by Most <\/span>\n <\/h4>\n\n <\/div>\n<\/div>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Many farmers are unaware that the temperature difference between the inside and outside of the barn has an impact on airflow distance even more than negative pressure itself. Theoretical calculations show that when the temperature difference increases from 10 degrees Fahrenheit to 70 degrees Fahrenheit, the distance cold air travels along the ceiling is shortened by 70%.<\/p>

For example:
Day 1: Inside 90\u00b0F, Outside 60\u00b0F \u2192 Temperature difference 30\u00b0F, airflow travels far along the ceiling.<\/p>

Day 2: Inside 90\u00b0F, Outside 40\u00b0F \u2192 Temperature difference 50\u00b0F. If static pressure and inlet opening remain unchanged, the heavier cold air will quickly sink to the ground.<\/p>

Therefore, the lower the outside temperature, the greater the need to increase the target static pressure to maintain sufficient jet velocity to counteract the premature descent of airflow due to increased density.<\/p>\t<\/div>\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\nThree Key Points for Negative Pressure Ventilation Management in Winter: <\/span>\n <\/h4>\n\n <\/div>\n<\/div>\n\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Higher negative pressure isn’t always better; it needs to be matched to the inlet area and fan displacement to ensure cold air has a sufficiently long preheating path along the ceiling.<\/p>

The greater the temperature difference, the higher the static pressure needs to be to prevent cold air from sinking prematurely. When the outside temperature drops sharply, remember to increase the air intake velocity.<\/p>

Flexibility is key; there’s no single “one-size-fits-all” approach. Start with 0.10 inches of static pressure and a 2-inch inlet opening, continuously optimizing based on flock performance and external climate.<\/p>

Mastering the principles and adjustment techniques of negative pressure ventilation allows you to create a warm, dry, and well-ventilated growing environment for your flock during the cold season, significantly improving production performance and animal welfare.<\/p>\t<\/div>\n<\/div>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t <\/div>\r\n <\/div>\r\n \t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>","protected":false},"excerpt":{"rendered":"

What is Negative Pressure Ventilation? A negative pressure ventilation system uses exhaust fans to draw stale air out of the chicken house, creating a pressure difference between the inside and outside. This forces fresh air to flow in evenly through controlled air inlets on the side walls or roof. The key is that the inlet […]<\/p>","protected":false},"author":1,"featured_media":9142,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-9140","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry-knowledge"],"yoast_head":"\nHow to maintain chicken house temperature using negative pressure ventilation?<\/title>\n<meta name=\"description\" content=\"In cold weather, chicken house ventilation management is one of the most critical aspects of poultry farming. 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