Hired-Hand System 1000 Power Vent - Manual (Page 6)

System 1000 Power Vent System 1000 Power Vent Why Constant Pressure? Why Constant Pressure? •• 3 3
Why Constant Pressure? Why Constant Pressure?
By maintaining the pressure in your house at a constant slight vacuum you can
be sure that fresh air enters the enclosure at a steady rate from all inlet areas.
Also, with a more even air entry, a better mixing of outside air with inside air
will occur, giving a more uniform temperature within the enclosure.
The key ingredient for proper mixing of air is the speed in which the air enters
the house. If cold air is drawn in too slowly, the air will drop to the floor,
causing drafts. To ensure proper air speed a negative pressure setting of
.0400"w.c. is recommended for warmer air to ensure a higher volume of air,
and a negative pressure setting of .1000"w.c. is recommended in colder air to
ensure a lower volume and better mixing of incoming air. (See illustrations on
next page for an example.)
It is important to set the pressure at the appropriate level to ensure maximum
efficiency. Too little vacuum, and the livestock could suffer from drafting, and
temperature shock. Too much vacuum, and fan efficiency is dramatically
reduced, increasing the levels of moisture, and ammonia in the enclosure, also
bring up electricity costs.