
DRI-STEEM Vapormist humidifier • Page 19
Note:
The above data apply to all air velocities up to 1,500 fpm (7.6 m/s), and are based on air
leaving the zone of humidification at conditions of 55 °F (13 °C) and the stated % RH.
Figure 19-1:
Single tube non-wetting distances
Table 19-1:
Single tube capacities
Tube size
Maximum capacity of
dispersion tube
Without drain With drain
inches DN lbs/hr kg/h lbs/hr kg/h
1½ 40 28.4 13 56.8 25.8
2 50 56.8 25.8 85.2 38.6
mc_042710_1416
Dispersion: Single tube
0102030405060708090
40
50
60
70
80
90
ENTERING % RH
LEAVING % RH
0
NON-WETTING DISTANCE IN INCHES
DUCT HEIGHT
24”18”12”9”
Figure 19-2:
Single tube with and without condensate drain
Note 1:
Recommended pitch toward humidifier for interconnecting
hose, tubing, or pipe:
• Vapor hose: 2" per ft (15%)
• 1½" tubing or pipe: ½" per ft (5%)
• 2" tubing or pipe: ¼" per ft (2%)
OM-496A
4.5" (114 mm)
minimum from
top of duct
Without drain
Pitch 2"/ft (15%)
Note 2:
Recommended pitch toward humidifier for interconnecting
hose, tubing, or pipe:
• Vapor hose: 2" per ft (15%)
• Tubing or pipe: 1/8" per ft (1%)
Pitch: See Note 2
Pitch: See Note 1
Pitch 1/8"/ft (1%)
4.5" (114 mm)
minimum from
bottom of duct
Condensate drain.
Pitch ¼"/ft (2%)
5" (127 mm)
1" (25 mm) air gap
6"
(152 mm)
OM-496B
With drain
4.5" (114 mm) minimum
from top
of duct
Table 19-2:
Hose kit sizing by model
Model
Hose kit
(vapor hose, dispersion tube, and hardware)
VM 2-8 1½" (DN40) hose kit without drain
VM 10-16
1½" (DN40) hose kit with drain
2" (DN50) hose kit without drain
VM 21-25 2" (DN50) hose kit with drain
VM 30-34
These models require multiple tube
assemblies and cannot use a hose kit.
mc_042710_1417
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