4
Sizing Best Practices
TrueSTEAM Humidification System
Guidelines are presented for determining how to choose the best TrueSTEAM
™
for your
application, taking into consideration best practices recommended by industry experts, and
other factors that influence indoor humidity loads.
Setting the Baseline
The Air-Conditioning, Heating and Refrigeration Institute (AHRI) set guidelines for determining
humidification capacity requirements. The recommendation is based on the square footage
and type of home construction, and assuming typical conditions. It is important to realize many
homes will have humidification requirements that differ from the guidelines depending on how
the circumstances differ from standard conditions. Factors that can influence the humidification
capacity requirements include:
> Geographic region
> Ventilation type
> Number of people living in the home
> Ceiling height
> Window type
> Insulation type
> Equipment type
AHRI has also established a standard method of determining capacity ratings, which provides a means for comparing products, including
those from different manufacturers. Capacity is determined by the output of the device as if it operated 24 hours per day. Honeywell
TrueSTEAM capacity ratings are determined by testing in accordance with the AHRI guidelines.
Sizing for the Job
Selecting the appropriate humidifier for the job is critical.
Chart 1: TrueSTEAM capacity ratings to maximum home size achievable.
This chart assumes fixed values in ceiling height, outdoor conditions, structure insulation, window type, number of occupants and ventilation
type. As these values change from home to home, so does the humidity load requirement, and potentially the humidifier model that is best for
the home. To better understand what TrueSTEAM size to choose, let’s review humidity load requirements.
Square Feet of Space 500 1000 1500 2000 2500 3000
AHRI* Recommended Output Delivery (GPD) 0.1 2.2 4.4 6.5 8.6 11.7
TrueSTEAM HM512 - 12 Gallons
TrueSTEAM HM509 - 9 Gallons
TrueSTEAM HM506 - 6.5 Gallons
*AHRI Guideline F-2007 for maintaining 35% RH in a tight, four-person residence with
8-ft. ceilings. Outdoor conditions = 20°F and 70% RH.
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