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Series GEN 2 Ultrasonic Humidifier IOM Manual
the overall area of the duct because they lower the available area and raise the air velocity. If air velocity
exceeds 750 FPM. The duct cross sectional area must be increased so the face velocity falls within the
recommended range (Figure 4 and Figure 5).
The enlarged duct section must extend at least 24 inches beyond the humidifiers in the direction of the air
flow to minimize condensation on the walls of the duct or air handler. Other variables that can affect
condensation are air temperature and turbulence. Avoid installing humidifiers in high turbulence areas or
immediately before or after an elbow.
If any obstacle exists in front of the atomized mist outlet, the mist will be condensed on the obstacle to form
water droplets. Humidifiers should never be placed one behind the other on the same level.
They must be placed either one directly above the other in the same vertical plane (Figure 4) or in a cascade
arrangement with the highest humidifier being the first one in the direction of the air flow (Figure 5). In either
case, minimum clearances between humidifiers must be maintained. The top and bottom humidifiers must
also have a minimum amount of space between them and between the top and bottom of the duct.
NOTE: Humidity control can only be achieved in a sealed room or if the room has vapor barriers
installed. It is recommended that walls, ceilings and floors be sealed to prevent migration of humidity.
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