An animal confinement housing includes an air intake section and an animal confinement section. Air is drawn into the housing through the air intake section and directed through the confinement section to ventilate the confinement section and the animals confined therein. The height of the confinement section can be selectively varied between a raised position of sufficient height to permit personnel and equipment to enter the confinement section and a lowered position that is of sufficient height to accommodate the animals confined therein by reduces the cross-sectional area through the confinement section to increase the air flow rate through the confinement section, without requiring an increase in the rate of intake of air into the air intake section.
