Nortec MH Series - Manual (Page 16)

13 | Installation
Location – Duct Module
The MH Duct module is designed to be installed on the floor of a duct or air handler. Position
the drain pan so that there is an equal gap between the pan and both side walls. The drain pan
should be oriented so that the media boxes and overflow will be upstream of the drain pan
outlet.
 Ensure mounting surface is strong enough to support the full weight of the duct module,
mist eliminator and water in the evaporative media and drain pan (see MH Specifications
 Table 3: MH Specifications for approximate weights).
 Provide a watertight section in the area of the duct unit that extends a min. of 36 in (92cm)
from the end of the duct module. If demineralised water is used use corrosion resistant
materials.
 A mist eliminator is not required for media face velocities below 750 fpm; however as the
media reaches its end of life, there is a risk of droplet carry over. A drain is required in the
watertight section downstream from the duct module.
 Air filters meeting ASHRAE 52.2 MERV 8 or MERV 11 must be installed upstream of the MH
duct module.
 Ensure an access door and sufficient space for replacing media boxes is provided
downstream of the MH duct module. Provide extra space for opening /removing mist
eliminator to access media boxes if mist eliminator is installed.
 In case the outside of the duct or air handler walls are in contact with low ambient
temperature insulate the outside of the duct to prevent condensation inside the duct.
 Clearance dimensions shown are for reference only and are the minimum required for
maintenance of the humidifier. Consult local and national codes before final location and
installation. Nortec does not accept responsibility for installation code violations.
Figure 11: MH Duct Module Location