other design features for more uniform temperatures and improved calf nursery ventilation include : 1 ) preheating the ventilation air before it enters the calf room , 2 ) distributing air to the ceiling with round holes and adjustable slots adjusted to give at least 4 m/s inlet velocity , 3 ) using a properly sized centrifugal fan running continuously to exhaust air from near the floor in winter and 4 ) protecting air intakes and fan openings from the effects of wind .
C1521970
features
C0039476
temperatures