Clips are attached to the window unit being rotated
into place within a groove designed to accept the clip.
The clip, depending on the length may be face
anchored to the rough opening with one #8 x 1-1/4”
sheet metal screw into face of the wood buck.
If the clip is longer so it projects out beyond the wood
buck or rough opening, then it can be bent to be
flush with the interior surface of the buck or rough
opening. Use two #8 x 1-3/4” flat head sheet metal
Screws.
Determine the spacing between clips along each long
side. The same spacing used in the window’s design
pressure lab testing of the unit should be used for
installation. Start with a distance from corner of no
less than 8” and not greater than 16” o.c. 
Window Fitters Guide to Window Installation
120                 Contents ©2022-Do not reproduce without permission
If you’re using slow expansion foam sealing tape, place the
support blocks along the sill (masonry or wood openings)
and cut out the shape from the foam and place the foam
along the sill. Set the window in the opening, and using a
putty knife, place the header and jamb foam tape into the
opening making sure the sticky side adheres to the window
frame. To prevent leaking at the corners, use sealant to fill
any voids
5. Fastening with Clips
IMPORTANT-
Avoid using an odd number
of brackets. Human nature
wants to put one in the 
center. Even if 4 or 8 brack-
ets might be figure to be
extra for your install, they
will produce a better result
than 3 or 7 in most cases. 
Start by pinning off the 4
corners only. Level plumb
and square. Then work
down the jamb and alter-
nating sides. Test window
operation after every set of
clips are installed. This 
gets a consistent result and
doesn't take much longer
once it becomes routine.
For assemblies of several
individual units mulled
together, calculate clips 
and spacing for each 
individual unit and attach
clips to the available 
outside perimeter sides. 
At the end of mulls, 
additional fastening might
be required. Confirm with
project engineer or architect
or manufacturer.
Not
To
Scale
Not
To
Scale
SAMPLE MANUAL

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