Is there any advantage in equipping a broiler house to run in tunnel ventilation mode with air velocity over 400 ft per min (2 m/s)?
Yes, if you are growing a large enough broiler. USDA research has shown that increasing air velocity to 600 ft per min (3 m/s) gave only slight advantages up to the 6th week of a growout, but in the 6th and 7th weeks 600 ft per min (3 m/s) produced a significant boost in weight gain over 400 ft per min (2 m/s) airflow. Larger birds have a smaller surface area to mass ratio, which makes it harder for them to dissipate excess heat. This means that they will get relatively greater performance benefit from the high air velocity cooling than smaller birds will. It should be remembered that air velocity is not the only factor to be considered in equipping a poultry house. To be able to handle heat removal, the typical modern 40 ft x 500 ft (12 x 152 m) broiler house will be equipped with a fan capacity that will generate at least 500 ft per min (2.5 m/s) air velocity down the house. If very large birds are to be grown, even greater fan capacity and the resulting higher air velocity may be ne
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