Installation Guide

6 Customer Care Center 1-800-732-2677
Fit Core Covers
4A Measure the thickest part (T) of your cut-out. Note
this measurement.
4B Depending on the thickness of your door, you may
not need the tunnel support and plastic core covers or the
plastic core covers may need to be trimmed for your
installation. Use the “Plastic Core Covers Cutting Guide”
(Chart 1) to determine this. If you are using the plastic
core covers and tunnel support, go to Step 4C. If you
are NOT using the plastic core covers and tunnel support,
go to under Step 5.
Plastic Core Covers Cutting Guide
Cut-Out
Thickness (T)
Plastic Core Cover
Cutting Instructions
3
⁄
16
” - ½”
(5 mm -13 mm)
DO NOT use plastic core covers and
tunnel support. Go to Step 5.
½” - 1 ¾”
(13mm - 44 mm)
If cut-out thickness (T) does not line
up with a groove on the plastic core
cover, then cut to next groove that
is smaller than the cut-out thickness
(T). See illustration 4B. Use tunnel
support. Cut and go to Step 4C.
1 ¾” - 2”
(44 mm - 51 mm)
No cutting of plastic core covers is
needed. Use tunnel support. Go to
Step 4C.
Chart 1
4C Insert the long plastic core cover into channel of
“U”-shaped section of tunnel support. Insert the short
plastic core cover into channel of straight section of
tunnel support.
4D Turn over assembled tunnel and insert plastic core
covers of assembled tunnel between frame posts and
lip on flap opening of exterior frame (frame without the
flap). Tunnel support should be facing up.
Optional:
Use duct tape in the
corners of core covers to help secure
in place and to improve weather
resistance.
4A
4C
4D
4B
Step
4