CAUTION
Each humidifier requires its own steam hose and dispersion tube. Do not connect steam hoses from more than one humidifier
together. Back-pressure from one humidifier can lower the water level in the canister in the other humidifier and cause
operational problems.
Do not install the dispersion tube in a duct with greater than 2 in. wg static pressure. High duct pressure can cause back-
pressure in the canister which can result in unstable unit operation.
TABLE 3 – Absorption Distance (Minimum distance from dispersion tube downstream to any obstruction or bend in duct)
Humidifier
Output (gal/day)
Airflow Velocity*
70°F & 30% RH
Setpoint
70°F & 45% RH
Setpoint
65°F & 45% RH
Setpoint
45°F & 45% RH
Setpoint
Up to 16.0
300 fpm 13” 19” 23” 30”
600 fpm 6” 10” 12” 18”
1200 fpm 3” 5” 6” 13”
1800 fpm 2” 3” 4” 10”
20.5 – 25.0
300 fpm 15” 23” 28” 45”
600 fpm 6” 12” 13” 26”
1200 fpm 5” 6” 7” 19”
1800 fpm 3” 4” 5” 16”
25.0 – 35.0
300 fpm 24” 31” 36” 60”
600 fpm 17” 22” 26” 48”
1200 fpm 12” 15” 18” 25”
1800 fpm 10” 13” 15” 20”
*Velocity in feet per minute = Duct airflow volume in cubic feet per minute / duct area in square feet.
Example: 1,200 cfm through 16” x 12” duct = 1,200/(12 x 16/144 sq. in./sq ft.) = 1,200/1.333 = 900 fpm
INSTALLATION INSTRUCTIONS (CONTINUED)
ELEVATION
The preferred location for the dispersion tube is higher than the
humidifier so that the steam hose has a constant downward slope of at
least 2” per foot from the dispersion tube to the humidifier. If hard pipe
is used, the slope can be 1/4” per foot. With the constant downward
slope, any condensation that forms in the steam hose will drain back
into the steam canister. See Figure 3.
FIGURE 3 – Dispersion Tube Mounted Above Humidifier
90-1704
90° long sweep
or two 45° elbows
Pitch*
Duct
Dispersion
tube
5” minimum
Steam hose or pipe.
Insulate pipe with 1” fiberglass
to reduce steam loss.
* Pitch steam hose down
from dispersion tube to
humidifier:
2”/ft (15%) minimum
when using steam hose.
1/4”/ft when using
hard pipe.
8
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