Installation Guide
QCI5150 Rev 0 Page 5 Cered 6/6/2016
1 If a continuous unit centerline does not exist from
the original measuring process, it will be necessary to
create one. Lightly mark a continuous unit centerline
on the threshold. Next, mark a continuous unit cen-
terline on each wall, starting where the threshold cen-
terline meets the wall. Use a level to ensure the wall
centerline is plumb and straight. The wall centerlines
should be a minimum of the unit height from the
threshold.
Note: Centerline (CL) is a term used to describe the
center or mid-point of the unit. The position of the unit
centerline can be located anywhere within the width
of the threshold, as long as adequate structure exists
beneath the centerline for fastening and the outer
edges of the unit will not overhang the threshold. The
most common unit centerline position is the middle of
the threshold.
2 Use a level to check the threshold for out of level
conditions if the original measured conditions are
not available. If no conditions exist, measure up
each all centerline a distance of Unit Height - 1/2”
from the threshold, and clearly mark each location.
Note: Header Mount Hole = Unit Height - 1/2“ , or
Panel Glass Height + 1 11/16”
If out of level conditions exist; measure up the
“high” side wall centerline a distance of “Unit
Height - 1/2” from the threshold and clearly mark
this location. For the wall centerline distance on the
“low” side of the threshold, use a level to determine
the threshold out of level distance and add that val-
ue to the equation “Unit Height - 1/2”. Measure this
summed distance up the “low” side wall centerline,
from the threshold and clearly mark this location.
Next drill a 3/16” diameter hole through the finished
wall material at each marked wall location. Drill a
1/8” pilot hole 2” deep into the wooden blocking.
(See illustration example.)