Broiler House Ventilation

Ventilation that has to change character completely over a 42-day cycle — from brooding chicks that must not feel a draught, to full-grown birds that need tunnel velocity to survive a hot afternoon.

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  • 5equipment groups

WhatOne house, three ventilation regimes

A broiler crop moves through three distinct requirements. In the brooding week, chicks need 32–34 °C and almost no air movement, with ventilation running only to remove moisture and ammonia. Through the growing phase the rate climbs steadily as the birds put on weight and produce more heat and moisture. In the final weeks in hot weather, the house runs full tunnel — maximum airflow along its length to cool birds by wind chill.

WhoWho buys it

Integrators operating contract grower networks, independent broiler farmers, farm construction contractors and regional agricultural equipment dealers who stock for their grower base.

WhyWhy the failure mode is total

A tunnel-ventilated house on a hot day depends entirely on continuous airflow. If the fans stop, house temperature climbs beyond the birds’ tolerance within roughly half an hour and the whole flock can be lost. That is why backup power, an alarm independent of the controller, and naturally ventilated fallback openings are part of the specification rather than optional extras.

HowSizing the modes separately

Minimum ventilation is calculated from the birds’ moisture and ammonia output at the coldest expected condition — it is an air-quality duty, and running it harder simply wastes brooding heat. Tunnel ventilation is calculated from the target air velocity along the house at the hottest condition, then converted to fan capacity at the static pressure the house actually operates at, with inlet baffles and evaporative pad in place. Rating fans on free-air airflow is the classic error and produces houses that cannot reach tunnel velocity.

Equipment this application needs

Axial Flow Fans Tunnel fans Axial Flow Fans752 Large-diameter low-speed units producing house-length velocity. Compare on airflow at operating static pressure, never free-air. Exhaust Fans Minimum ventilation Exhaust Fans134 Small, precisely controlled units running intermittently in cold weather for air quality alone. Air Coolers Evaporative pad cooling Air Coolers264 Adds several degrees at the tunnel inlet in dry climates, on top of the wind-chill effect. Industrial Heating Equipment Brooding heat Industrial Heating Equipment63 Chicks need 32–34 °C in week one — a heating load far larger than the adult flock ever needs. Ventilation Fan Parts Shutters, belts & motors Ventilation Fan Parts261 The consumables that decide whether the house runs through the next crop.

What to check before you order

Corrosion Resistant 260
Ammonia plus high-pressure washdown between crops. Decides whether a fan lasts two years or ten.
Industrial Grade 1,600
Months of continuous running with no maintenance access while the house is occupied.
Energy Saving 1,205
Fan energy is one of the largest controllable costs per bird produced.
380V 2,095
Three-phase for tunnel fan banks.
IP55 / IP68 301
Sealed motors that survive direct washing between crops.

Products for this application

Questions buyers ask

How many tunnel fans does a broiler house need?
It follows from the target air velocity along the house, the cross-sectional area, and the airflow each fan delivers at the static pressure the house actually runs at — with inlet baffles and evaporative pad fitted. Free-air ratings overstate delivery substantially, and sizing from them is the most common reason a house cannot reach tunnel velocity on the day it matters.
What ventilation do chicks need in the brooding week?
Very little air movement and a great deal of heat: 32–34 °C with ventilation running only enough to remove moisture and ammonia. Draughts at this stage chill chicks directly and cause both mortality and uneven growth, so minimum ventilation is deliberately kept low and delivered through inlets that mix incoming air near the ceiling.
How long does a flock survive if ventilation fails?
On a hot day in a tunnel-ventilated house, under half an hour. That short window is why alarms independent of the controller, backup generation, and fallback openings that can be released manually are treated as part of the ventilation system rather than as accessories.

Related applications

Poultry & Livestock House Ventilation Tunnel and minimum-ventilation fans, evaporative cooling and house heating built for an ammonia-laden, washdown environment where a ventilation failure is measured in… Layer House Ventilation Continuous, year-round ventilation for birds that stay in the house for well over a year — where equipment reliability is measured across… Greenhouse & Horticulture Climate Control Fan-and-pad cooling, circulation fans, exhaust and heating for protected cropping — sized on air changes and on the crop's vapour pressure deficit,…

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