2
Capacity Selection Guide
Operation
Your centrifugal atomizer type humidifier operates on the principle of breaking down water
droplets into a fine mist and atomizing the moisture into the air.
If applicable, set the humidistat in the recommended range of 30-40% relative humidity for
automatic humidity control during the heating season (a lower setting may be used to control
condensation on single pane windows). During the first heating season, check the mineral
buildup in the humidifier every month to establish the proper cleaning schedule. Clean the unit
at the end of each heating season, or whenever mineral deposits appear to be impeding the
discharge of the water mist.
When shutting the humidifier down for the summer months, start with cleaning any mineral
accumulation from the unit. Leave the water turned off and the unit dry. If the furnace fan is
to be used for cooling purposes, disconnect power to the humidifier or turn the humidistat to
the OFF position.
Sq. Footage of
Home
1000
1500
2000
2500
3000
4000
Tight Home
(GPD*)
0.5
3.0
5.0
7.5
10.0
14.5
Average Home
(GPD*)
5.0
10.0
14.0
19.0
23.5
33.0
Loose Home
(GPD*)
10.0
16.5
24.0
30.5
37.5
51.5
The above calculations are for reference only and are based on the following:
• Inside temperature 70° F/35% relative humidity
• Outside Temp 20° F /70% relative humidity
• 8 foot ceiling height
• Internal moisture gain of one pound per hour
• Furnace on-time of 70%
This chart uses A.R.I. standard designations:
A “Tight Home” is assumed to be well insulated with vapor barriers, tight storm windows and
doors, and a dampered fireplace. Air exchange rate of .50 changes per hour.
An “Average Home” is insulated and has a dampered fireplace, but there are no vapor barriers,
storm doors, or storm windows. Air exchange rate of 1.0 change per hour.
A “Loose Home” is generally one constructed before 1930, has little or no insulation, no storm
doors, storm windows, weather stripping or vapor barriers, and often no effective dampering of
fireplaces. Air exchange rate is as high as 1.5 changes per hour.
* GPD= Gallons Per Day (humidifier capacity)
