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General Information
Relative humidity is important to your health and home
as proper humidification helps reduce respiratory difficul-
ties and helps improve the indoor air quality.
A good relative humidity is one just high enough to barely
start condensation along the lower edges or lower
corners of the windows. More than that can be damag-
ing.
Frequent fogging or excessive condensation on inside
windows indicates the indoor humidity level is too high
for outdoor weather conditions. Damage to the building
may result if the condition persists. Condensation on
inside of storm windows indicates loose inside windows.
Adding weather-stripping to tighten inside windows
usually corrects this problem.
The following table shows the recommended maximum
indoor humidity in relationship to the outdoor tempera-
tures.
Outdoor
Humidity
Temperature
Single -Paned Double-Paned
Glass
Glass
+30°F
30%
50%
+20°F
20%
40%
+10°F
15%
35%
0°F
10%
30%
-10°F
5%
25%
-20°F
5%
20%
-30°F
3%
18%
Table 1
For Propane (LP) Installations Only
For furnaces operating on propane, please review the fol-
lowing warnings before use.
WARNING
To avoid death, personal injury or property damage
due to explosion or fire, install a gas detecting
warning device. Since the odorant in propane gas
can be reduced by iron oxide (rust), a gas detecting
warning device is the only reliable method to detect
propane gas leaks.
WARNING
If the gas furnace is installed in a basement, an
excavated area or a confined space, it is strongly
recommended to contact a propane supplier to install
a gas detecting warning device in case of a gas leak.
• Since propane gas is heavier than air, any leaking
gas can settle in any low areas or confined
spaces.
• Propane gas odorant may fade, making the gas
undetectable except with a warning device.
WARNING
An undetected gas leak will create a danger of
explosion or fire. If the presence of gas is suspected,
follow the instructions on the front cover of this
manual. Failure to do so could result in SERIOUS
PERSONAL INJURY OR DEATH.
