NEGATIVE AIR PRESSURE
Negative indoor air pressure results when more air is leaving your home
than is coming in, creating a partial vacuum. In winter, the heated
indoor air rises up through the home and escapes from upper level leaks.
At the same time, we force air out of the house with kitchen & bath fans,
clothes dryers, furnaces, fireplaces and water heaters, all of which
contribute to the negative pressure problem, which is a lack of
“make-up air”.
This can lead to annoying situations such as a stove that won’t draw
or possibly leaks smoke.
FRESH AIR KIT, 3’: Part # ACFAKT03
1 x 2” galvanized hood with screen, 1 x 2” aluminum flex duct (compressed 15”, extends to 36”),
2 x 2” worm gear clamps
FRESH AIR KIT, 10’: Part # ACFAKT10
FRESH AIR REQUIREMENTS AND RECOMMENDATIONS
1 x 2” galvanized hood with screen, 1 x 2” aluminum flex duct (compressed 48”, extends to 120”),
2 x 2” worm gear clamps
Outside air is REQUIRED ON ALL MOBILE HOME INSTALLATIONS
NOTE: When extending the fresh air intake more than 10 feet, it is recommended to increase the vent
diameter to 3” or larger.
C
C
A
A
B
B
Outside air is HIGHLY RECOMMENDED for all other installations
When outside air is taken from an
existing chimney, the exhaust system
MUST NOT terminate in the same
chimney
The outside air pipe on your stove is
2” O.D. The outside air connecting
pipe must be at least 2” I.D. The
outside air connecting pipe must be
as short and as free of elbows as
possible, and MUST FIT OVER, not inside,
the outside air pipe on your stove (C)
A wind shield (B) over the termination of the outside air pipe or a 90 degree elbow or bend directed
away from the prevailing winds MUST be used when an outside air pipe is installed through the side
of a building. Keep the outside air pipe
termination at least 1 foot away from
the exhaust system termination
Use metal pipe ONLY
, either solid or flexible, for your outside air installation (see A below).
NON-METALLIC MATERIAL MUST NOT BE USED!
FRESH AIR KIT 3’
FRESH AIR KIT 10’
WITHOUT PLANNED VENTILATION, NEGATIVE AIR PRESSURE
WILL DRAW AIR IN AT UNCONTROLLED POINTS.
OUTSIDE AIR
CONSIDERATIONS
7
A fresh air kit is HIGHLY RECOMMENDED for all corn appliance installations.
If an outside air source is not supplied, a
negative air
situation may occur.
