Superior MHW36R Installation And Operation Instructions Manual page 9

VENTING INSTALLATION
Continued
Room Above
Figure 12
Attic Above
Figure 12A
14" Min.
Note: Trim Thimble/
Extension To Desired Length
And Pitch At The Rood Line
Thimble
Extension
Pitched Roof
14" Min.
Bow Roof
Figure 12B
127312-01D
Firestop Spacer
1" Clearance
Minimum
Firestop Thimble
Outer Pipe Of
Chimney
Thimble
FM8-AT1
Pitched Roof
Outer Pipe Of
Chimney
14" Min.
13"
Thimble
Outer Pipe Of
Chimney
Thimble
SuperiorFireplaces.US.com
Do not allow insulating materials to be blown into
the space inside the thimble and the chimney. To
do so could result in a fire hazard.
Outer Pipe Of
Chimney
14" Min.
Figure 12C
PENETRATING ROOF
To maintain a 1" clearance to pipe on a roof with a pitch, a rectangular
opening must be cut.
1. Determine center point through which pipe will penetrate the roof.
2. Determine center point of the roof. Pitch is the distance the roof drops
over a given span, usually 12". A 6/12 pitch means that the roof drops
6" for each 12" measured horizontally down from roof rafters.
3. Use roof opening chart (Figure 13) to determine correct opening
length and flashing required.
4. Remove shingles around opening measured. Cut out this section.
5. Add next sections of pipe until end penetrates roof line. Check to see
that proper clearances are maintained. Extend chimney by adding
sections of double wall pipe until pipe is minimum of 30" above
highest point of roof cutout. Termination and chimney must extend
a minimum of 36" above highest point where it passes through roof.
Minimum Measurements
14 / "
3
8
(36.5 cm)
1"
(2.5
cm)
1"
(2.5
cm)
PITCH SLOPE OPENING "A" MAX FLASHING MODE NO.
Flat 0°
0-6/12 26.6°
6/12 - 12/12 45°
Figure 13 - Determine Roof Opening
WARNING
Thimble Cathedral
Ceiling
30"
(76.2 cm)
1"
(2.5 cm)
Opening "A"
15" 6F-8
16-1/8" 6F-8
20-3/8" 12F-8
9