Construction of Intake Flues for Barns

Where Cows Face in is r„K ~~CT I N dairy barns where the cows face in, it is well:to arrange the joists running crosswise so that the fresh air inlets may be constructed at very little expense by sealing-over between two joists. Where the joists run lengthwise, it is necessary to construct fresh air intakes which hang below the joists. The construction of the intake flue shown in the illustration is similar to that shown on the opposite page, except that it is extended to the center of the barn so that the fresh air may be released at the ceiling and in front of the cattle. The fresh air duct should be made of D. & M. Boards, double thickness, with either one-half inch air space between or insulated with building paper. This is necessary to prevent condensation on the barn ceiling "and walls in line with these fresh air ducts. When the warm air in the barn strikes these fresh air ducts, which are, of course, colder, condensation takes place unless the proper insulation is provided. The outside openings should have STAR Registers fitted with automatic shut-offs which can be operated from the inside of the barn. The openings in the ceiling should be fitted with STAR Register Faces. Note particularly the deflectors which divide the fresh air ducts so that the air is released into the barn where otherwise the tendency would be to travel the length of the entire duct. Also note that the inlet where the fresh air is taken in is located from three to four feet lower than where the air is released. This is done to insure suction into the barn rather than a tendency for the warm air to leave. In other words, the warm air is trapped, preventing a too sudden cooling of the barn. Page One Hundred Sixty-four