Superior MHW36R Installation And Operation Instructions Manual page 9

If adapter is needed, secure it onto firestop
using holes provided (see Figure 10). The
row of holes on sides of thimble is provided
to allow for pitch variances. Position firestop
(top and bottom side) and thimble to desired
angle and secure with screws provided.
Insert thimble and firestop into prepared
opening and secure to ceiling by nailing
through firestop flanges. Thimble should
be even with or above roofline. Thimble
extensions are available (as an option) when
required. See Accessories on page 18.
Note: If there is a second story in the home,
firestop spacer 3600FS-8DM will be required.
See Firestop Spacers, page 11.
Insulation
Barrier
Firestop
Adapter Plate (If Needed)
Use for Flat
Firestop
Pitch Ceiling
Figure 10 - Use a Firestop Thimble
Assembly for Cathedral Ceiling,
Insulation Barrier and Roof
127312-01B
VenTing inSTallaTion
Continued
Thimble (Open End)
12"
Min.
Screw Holes
Provided
for Thimble
Firestop
Thimble
(Closed End)
Thimble
1.5"/12' Pitch
1.5"
12"
2.5"/12' Pitch
2.5"
12"
Adapter Plate
(For Flat and
1.5"/12' Pitch
Ceilings Only)
Use for 1.5"/12'
Pitch Ceiling
SuperiorFireplaces.US.com
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 11) to
determine correct opening length and
flashing required.
4. Remove shingles around opening mea-
sured. Cut out this section.
5. Add next sections of pipe until end pen-
etrates roof line. Check to see that proper
clearances are maintained. Extend chim-
ney 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
Flat 0°
0-6/12 26.6°
6/12 -
45°
12/12
Figure 11 - Determine Roof Opening
(76.2 cm)
1"
(2.5 cm)
Opening "A"
OPENING FLASHING
"A" MAX MODE NO.
15" 6F-8
16 / " 6F-8
1
8
20 / " 12F-8
3
8
30"
9