Tube systems to ventilate calf facilities have a plastic tube with a fan blowing fresh, clean outdoor air into the tube. Tubes commonly are made of either polyethylene or PVC and have one, two or three rows of holes uniformly distributed along the tube’s length. They are called positive-pressure tubes because the fan blowing into the tube creates a positive pressure inside the tube.
Tube ventilation for calf barns work
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Schematic of a mechanically ventilated barn with a tube system.
Figure 2. Throw is distance from tube outlet to where the air jet drops to 60 feet per minute. Air velocities at the hole are commonly between 1,200 and 2,000 feet per minute.
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