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Wisconsin Dairymen's Association / Fortieth annual report of the Wisconsin Dairymen's Association : held at Beloit, Wis., November, 1911. Report of the proceedings, annual address of the president, and interesting essays and discussions relating to the dairy interests

James, W. D.
Building the dairy barn,   pp. 64-81 PDF (3.4 MB)

Page 71

Wisconsin Dairymen's Association.             71
A good ventilating flue should have all the characteristics possessed
by a good chimney. It should be constructed with air-tight walls and
should rise above the highest portion of the roof, so as to get the full
force of the wind. It should be ha nearly straight as practicable and
should have an ample cross section.
There should be provided one outtake flue 2 feet square inside
measurement for every twenty cows, two for forty cows and so on.
When a barn is arranged so the cattle face each other, the intake
flues should be continued to the center of the barn that the fresh air
will be discharged in front of the cattle, having the outtake flues at
the rear; the fresh air will then pass the noses of the cows before
it does the gutter.
In this system the coldest air being at the floor, the ceiling being
tight, it is the cold air that is removed through the outtakes and you
can therefore stand a great deal of ventilation. If the pure air is
introduced at the ceiling, you bring the fresh air in contact with that
which has already been warmed, thus utilizing what would otherwise
be waste heat, to warm the air before it comes in contact with the
bodies of the cows. The air being brought in through a number of in-
take flues placed around the sides of the stable, the tendency to pro-
duce a cold draught is reduced to a minimum.
Provision is made for the air to enter the intake outside at a dis-
tance of 3 or 4 feet above the ground, so as to prevent the warm air
being drawn out at these places by suction or passing directly as it
would if they opened directly through the walls.

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