Page 2 RACINST4 (7/97)
STEP 5 Position the support brackets as shown in Figure 4. Attach to the shell with four (4) truss-head 10-24 machine
screws and four (4) flat nuts. Secure the bottom of the support brackets to the wall with two (2) wood screws.
Check the shell to allow for a 1/4" (6 mm) downward slope towards the outside. If used on other than wood
construction, screw the support brackets to a piece of 2" x 4" material.
FIGURE 4FIGURE 3
BOTTOM SIDE
RAIL
SILL CHANNEL NEXT TO WINDOW
FRAME.
WINDOW SILL
NOTE: ADJUST THE
SUPPORT BRACKETS TO
PROVIDE A 1/4" (6 mm) DROP
OF THE SHELL TO THE
OUTSIDE FOR WATER
DRAINAGE. THIS VIEW
SHOWS THE SHELL
MOUNTED IN THE WINDOW.
THE SUPPORT BRACKETS
ARE ASSEMBLED THE SAME
FOR A THRU-THE-WALL
INSTALLATION.
SECURE THE
LOWER END OF THE
SUPPORT TO THE WALL
WITH TWO SHEET METAL
SCREWS 12A X 2" LONG
(PART #906-011-08) DRILL
5-32" PILOT HOLES.
MACHINE SCREW 10-24 X 1"
(#906-067-00,4 REQ’D.)
FLAT NUT
910-026-00 (4 REQ’D.)
2" X 4" LUMBER (IF NEEDED)
SUPPORT
BRACKET
SHELL
STEP 3 Remove the paper backing from the 36" (91 mm) strip of foam gasket (3/8" x 3/4"(10 mm x 19mm)) and attach
it to the back side of the top and side brackets (Figure 2). The edge of the gasket and brackets should be
flush. Press the gasket firmly in place.
STEP 4 Slide the outer shell into the window opening as far as the sill channel will permit. The back side of the sill
channel must be in contact with the front side of the window frame (Figure 3). Drill two (2) 9/64" (3.6mm)
diameter pilot holes in the lower part of the window frame.
NOTE: Use the first empty hole in the bottom side rails of the shell, just back of the steel sill channel as a
guide. Secure the shell to the window channel with two (2) hex-head self-tapping screws 1-1/8"
(29 mm) long in the pilot holes. Part # 906-022-02 (Figure 3).
DRILL TWO 9/64" PILOT
HOLES IN THE WINDOW
AND INSTALL 2 SCREWS.
1-1/2"
(38 mm)