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INSTALLATION IN EXISTING
CONSTRUCTION
Installing the unit in an existing house requires at least a
small accessible area (attic or crawl space) above the
planned installation location.
Review “INSTALLATION IN A NEW CONSTRUCTION
SITE” and follow all instructions which apply to your
installation.
LOCATION – Locate ventilator next to a ceiling joist.
WIRING AND DUCTING – Refer to Figure 6 for wiring
and to Figure 2 for ducting. Plan ducting and wiring
before proceeding with installation.
CAUTION: Check area above planned installation to be
sure that:
1. Ducting can be installed.
2. Wiring can be run to the planned location.
3. No wiring or other obstruction might interfere with
installation.
INSTALLATION FROM ACCESSIBLE
AREA ABOVE (Using headers)
1. From below, drill a small hole in ceiling at the planned
location. Stick clothes hanger through hole to help
locate the area from above.
2. Locate hole in attic or crawl space.
3. Refer to Figure 7. In attic or crawl space, mark ceiling
for cutout by using the housing as a template. Cutout
dimensions 10
3
⁄
16"x14
3
⁄
8". The short side (10
3
⁄
16") or
cutout must be next to the ceiling joist.
4. Make cutout along marked line.
NOTE: Refer to Figure 3. If ceiling is plaster, cutout
should be made from below to avoid chipping plaster.
5. Refer to Figure 7. Install headers between joists using
nails or screws leaving 10
3
⁄
16" between them.
6. Refer to Figure 7. The mounting brackets must be
mounted on the long sides of the housing. NOTE: Each
of the mounting brackets are secured by two (2) hex
nuts.
7. Refer to pages 1 and 2. Mount damper section to
housing, install housing and connect wiring and ducting.
Install power unit, blower assembly and grille.
HANGER
ROD
FIGURE 6
HANGER
ROD SLOT
POWER
UNIT
MOUNTING
BRACKET
HOOK HANGER
RODS FROM
INSIDE TO
OUTSIDE
HEADER
FIGURE 7
MOUNTING
BRACKET
HEADER