Show ventilated dairy barn good scheme herd and structure should be given sufficient consideration by prof E R gross agricultural engineer rutgers university service ventilation in dairy barns and other animal shelters is not only necessary to maintain the general health of the live stock but also to protect the structure itself an odorous moisture laden atmosphere mo sphere is unhealthful and undesirable si odors may be absorbed by the milk excessive moisture aids development and spread of diseases and is depressing to the animals it also has a destructive effect on structural and insulating materials steel or iron equipment and the armour and insulating materials of electric conductors methods of ventilating may be grouped as natural or gravity bravi ty systems forced draft or mechanical systems and air change by leakage tightly built up to date barns require several intake openings of proper size construction and location the intakes should spill the air into the building near the ceiling cel ling the cool air will mix with the warm as it drops to the floor thus avoid ing drafts the size of intake flues has been standardized at 60 square inches at least one flue is required the flue will act much like a chimney or may have a forced draft from an electric fan its size should allow each cow 60 cubic feet of air per minute or five to seven air changes per hour in barns providing an air volume of cubic feet per cow six changes are needed the number of intakes and the size and height of out takes are governed by air requirements |