Instruction

15
Figure 21
Figure 23
METHOD 2: ROOF SUPPORTED
INSTALLATIONS
There are two types of Roof Supported
Installations: (A) Using a Square Ceiling
Support Box or Reduced Clearance Support
Box and (B) Using a Roof Support.
(A) Support Box: For a Square Ceiling Support
Box or Reduced Clearance Support Box, make
sure that the square box portion of the Support
Box can extend at least 2” below the low side
of the nished ceiling (Fig.7, 19). The Support
Box must remain level, and the top edge of the
box must cover the edge of the roof’s decking
material. Mobile home chimney installations
are roof supported.
A1. Place Appliance, Frame Opening:
Follow Step 1 and 2 from “Ceiling-Supported”
method detailed earlier. Refer to Table 1 for
clearance and framing specications. If it is
desired to install through a cathedral ceiling
(Fig.20), then the hole is cut in the roof. If a
separate ceiling and roof exists, as shown in
Fig.19 (Low Attic), rst cut and frame a ceiling
opening as in “Ceiling-Supported” Step 2.
A2. Install Support Box: Slip the Square
Support Box or Reduced Clearance Support
ROOF SUPPORT
TRIM COLLAR
FINISHING COLLAR
DURABLACK
SLIP CONNECTOR
USE 4 NAILS (OR
SCREWS) ON
EACH SIDE OF
SUPPORT
ROOF SUPPORT
(SUPPORT
BRACKETS AND
BAND)
SECURE ROOF
SUPPORT BAND TO
CHIMNEY USING
4 SHEET METAL
SCREWS
TIGHTEN BOLT
ON ROOF
SUPPORT BAND.
Figure 22
FLOORING
DURATECH CHIMNEY
PIPE
ROOF SUPPORT
MIN OF 3” BELOW
CEILING OR
EXPOSED FRAMING
FIRESTOP
RADIATION SHIELD
(TRIM RADIATION
SHIELD IF NEEDED
TO AVOID ROOF
SUPPORT)
FRAMING
MEMBERS
(ALL SIDES)