User guide
ASSEMBLY & INSTALLATION - THRU-THE-WALL (CONT.) 
 13 
Carefully measure and cut an opening with the following 
dimensions depending on your model (FIG. 1 & 2). 
WIDTH “X” = inside model plus twice the thickness of the 
framing material used. 
HEIGHT “Y” = inside model height plus twice the thickness 
of framing material used. 
4. Build a wooden frame with the INSIDE dimensions of 
your model listed above (Measure twice). The frame 
depth should be the same as the wall thickness. Fill in 
extra space from the opening to the studs with wood 
spacers as shown below. 
5.  Nail the spacers to the studs. They should be flush with 
the dry wall. 
NOTE: If wall thickness is 8-1/2” or more, add aluminum 
flashing over the bottom of the frame opening to assure 
water is unable to enter the area between the inner and 
outer wall. 
Prepare and Install the Cabinet 
1.  Slide the chassis from the cabinet. Refer back to the 
REMOVE CHASSIS instructions and FIG. 1-6 in the 
WINDOW MOUNTING SECTION. 
2.  Place the cabinet into the opening with the bottom rail 
resting firmly on the bottom board of the wood frame. 
3.  Position the cabinet so it is tilted properly for water re-
moval as seen below. 
4.  Secure the bottom rail to the wood frame with two large 
1” (2.5 cm) long wood screws as shown below. 
Model GM-WAC-15ESE-
C 
GM-WAC-18ESE-C 
Inside Fram
e Height 18 1/8” (46
.1 cm) 
Inside Frame Widt
h  23 7/8” (60.6 cm) 
FIG. 2 
FIG. 1 
FIG. 2 










