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Y: Inside Frame Height: 18" (45.7cm) [15K, 18K
BTU models] or 18 ⅞" (47.9cm) [25K BTU mod-
els]
X: Inside Frame Width: 23⅞" (60.6cm) [15K,
18K BTU models] or 26¾" (67.9cm) [25K BTU
models]
4. Build a wooden frame with the inside dimensions of your model as listed above.
(Remember to measure twice, cut once!) Frame depth should be the same as the
thickness of the wall. Fill in the space from the opening to the studs with wood
spacers as shown.
5. Nail frame to spacers, ensuring that the front of the spacers is flush with the drywall
(Fig. AC)
Nail Spacers
To Studs
Level
Fig. AC
NOTE: If wall thickness is equal to or greater than 8 ½", add aluminum flashing over
bottom of frame opening to ensure no water can enter area between inner and outer
walls. See Fig. AD
Y
Inside
Frame
Height
Aluminum Flashing Over
Bottom of Frame
–24–
Inside
Frame
Width
X
Up to
Fig. AB
8 ½"
Fig. AD
Over
8 ½"
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