Installing Your Furnace
Recessed Mount Installation
FIND THE STUDS
Use a stud locator or small finishing nails. Repeatedly drive and
remove a nail into the wall in the area of the stud until you find it.
Then find one side. Leave the nail there. Drive another nail just on
the other side of the same stud.
Inside edge of the other stud should be about 14½-inches from
the one found. Drive finishing nail on inside edge of this stud.
NOTE: If studs are not on 16-inch centers, see
section “Close off Stud Space”, below.
CUT WALL OPENING
1. Lay out the required opening to be cut in inside wall (Fig. 8).
Mark center of the vent hole on wall. Using a window, door or
wall corner for reference, measure to find where vent will be
on outside wall. Check to be sure clearances (Page 7, Fig. 2,
and Page 8, Fig. 4, 5, 6 and 7) will be right.
2. Drill a ¼-inch hole through vent hole center to the outside wall
to mark vent location.
3. Make the required cutout in inside wall. (Fig. 8).
4. Using the hole drilled through to the outside wall as the center,
cut a 9¼-inch diameter hole for the vent. It may be better to
work from outside, especially when breaking through brick,
stone or tile. (See Fig. 8).
5. In new stud wall construction, install blocks as shown in Figure
7 and install plaster grounds around inside of wall opening.
6. The vertical height of the opening shown is 3-inches greater
than height of furnace to allow space for connection of wiring
after furnace is installed.
NOTE: Vertical measurements are from finished
floor. (Fig. 7).
CLOSE OFF STUD SPACE (If Required)
If studs are not on 16-inch centers, cut the hole for the furnace
next to an existing stud and frame in the other side using a 2"x 4"
and spacer blocks as required. As shown on Page 9, Fig. 9.
If the distance from the top of the cutout to the ceiling wall plate is
more than 18-inches, it is recommended that it be closed off.
Nail a 2"x 4" long enough to go between the studs at the top of the
opening to close off the stud space.
FIGURE 8 Wall Opening for Recessed Mount
FIGURE 9 Close Off Stud Space
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