15
SELECTION
In addition to the GPD differences highlighted above, other criteria specific to the home must be taken into account to select the best humidifier
option for the home. The Air-Conditioning and Refrigeration Institute (ARI) Guideline for Selection, Installation and Servicing of Residential
Humidifiers lists the following factors to consider when determining humidity capacity requirements:
• Indoor and outdoor temperature and humidity conditions
• Conditioned space volume
• Tightness of structure, insulation, storm windows and doors.
• Quantity of outside air entering the conditioned space
• Mechanical and natural ventilation
• Fireplace dampers (ARI ratings are based on these being closed)
• Internal load requirements
• This includes bathing, laundry habits, cooking, number of occupants. 2 gallons per day is factored
off the GPD figures below to account for internal sources of humidity (based on a family of four)
Taking these considerations into account, ARI recommends the following humidity
capacity ratings (GPD) for the size and type of building construction:
Summary
Many factors must be considered when choosing the right humidifier for the particular application. This technical brief is meant to serve as
a guide for not only choosing the right humidifier style and size for the home’s equipment and runtime, but also to convey the importance of
understanding the nuances in output ratings as they relate to the particular home. Applying these recommendations to the home’s you install
whole-house humidification into will lend not only to the optimized comfort of the home’s occupants, but also help them to conserve energy
and save money. All of which serve to increase your bottom line through reduced callbacks, and repeat business.
Works Cited
1. 2007 Guideline for Selection, Installation, and Servicing of Residential Humidifiers. ARI Guideline-F, 2007.
Additional information can be found online at www.forwardthinking.honeywell.com/truesteam
Humidity Requirements, GPD*
Type Size of building, sq. ft [m
2
]
500
[46.45]
1000
[92.90]
1500
[139.35]
2000
[185.80]
2500
[232.25]
3000
[278.80]
Tight
.01 2.2 4.4 6.5 8.6 10.7
Average
1.3 4.5 7.8 11.1 14.3 17.6
Loose
2.6 7.2 11.8 16.4 21.0 25.6
*Based on 8-ft ceiling height, indoor conditions of 70°F and 35%RH, outdoor conditions of 20°F and 70%RH.
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