Instructions / Assembly

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2. INSTALLATION
2.1 INSTALLING THE RM WHF-4.0
1. Determine in which area you would like to install your QuietCool Roof Mount Fan (see diagrams below)
2. After choosing the location where your roof mount fan will be installed, nd the closest rafter to that
location and determine if your roof has either 16” on center or 24” on center rafter spacing. The above
diagrams show what rafter spacing and roof joist spacing is required for each installation type.
IMPORTANT: If you are installing the RM WHF-4.0-PL, skip to section 2.5 on pg. 10.
IMPORTANT: Before installing the RM WHF-4.0-DB, you will need to nd the exact location for your damper
box and grille to ensure the duct will t between the fan location and the damper box location. Locate the
ceiling studs and mark the location for the box to be installed. Minimum of 36” clearance required. Make sure
the duct will t between the fan location and the damper box location. The duct is 9’ long.
IMPORTANT: The RM WHF is designed for roof rafters that have spacing of 24” or greater on center. For DG1
and DG2 installation, you may install the fan on roofs with rafters spaced at 16” on center, however, you will
want to center the fan unit over the bay in which you are installing the damper grilles. In this scenario, a few
inches of the fan hole will overhang into another bay on either side. As long as the other bays are sealed, this
should not be an issue as the air will only pull from the damper grilles within the center bay.
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24” on center
16” or 24” on center
16” or 24” on center
16” or 24” on center
24” on center
24” on center
16” or 24” on center
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