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
Tube Ventilation System - J&D Manufacturing
New group calf pen housing with positive pressure tube ventilation
Tube ventilation for calf barns work
Positive Pressure Tube System - VES-Artex
Calf Barn Ventilation 101 by Crystal Creek®
Calf Ventilation: Northern New York Case Studies - Calf-Tel
Calf Barn Project in Dreams? Best tips for calf barn design – 4dBarn
Tube Ventilation System - J&D Manufacturing
Cow housing, South West England, UK
Calf Vents