Desa CD42M-A2 - Manual (Page 8)

www.desatech.com 111916-01F 8
Figure 7 - Vent Termination (Horizontal)
Direct-Vent Pipe
CD32M and
CD36M-A
4
1 /
4
" Inner and
7 1 /
4
" Outer
CD42M-A
5" Inner and 8"
Outer
Wall Firestop
Maintain 1"
Minimum
Air Space
Around Outer
Pipe when
Penetrating a
Wall
Horizontal
Termination
(Vent Cap)
Screws
Exterior Wall
with Vinyl
Siding
Deflector
Shield
Minimum Pipe
Overlap 1
1 /
4
"
Siding Standoff
(Optional)
Framed Openings
CD32M and
CD36M-A
10" x 10"
CD42M-A
10
3 /
4
" x 10 3 /
4
"
6. For vertical installation, a vertical termination is
available. Also for vertical venting application,
install vertical flue restrictor into inner collar of
fireplace as shown in Figure 6, page 7.
When installing a length of pipe for vertical
termination that is over 3 ft., support the pipe
every 3 ft. using metal wall straps. Vertical to
horizontal pipe must be kept at a 1 ft. to 4 ft. ratio
with a maximum run of no more than 20 ft.
If an offset is necessary in the attic to avoid
obstruction, it is important to support the
vent pipe every 3 ft. to avoid excessive
stress on the elbows and possible separation
(see Figure 8).
Clearances must be maintained between the roof
and the termination. Refer to chart below.
Roof Pitch Minimum Height
Above Roof
Flat - 7/12 1 ft. (30.48 cm)
7/12 - 8/12 1 1 /
2
ft. (45.72 cm)
8/12 - 9/12 2 ft (60.96 cm)
9/12 - 10/12 2 1 /
2
ft (76.20 cm)
10/12 - 11/12 4 ft (121.92 cm)
11/12 - 14/12 5 ft (152.40 cm)
14/12 - 16/12 6 ft (182.88 cm)
16/12 - 18/12 7 ft (213.36 cm)
18/12 - 20/12 7 1 /
2
ft (228.60 cm)
20/12 - 21/12 8 ft (243.84 cm)
INSTALLATION
Continued
Figure 8 - Vertical Termination with
Offset and Wall Strap
Wall Strap
Roof
Flashing
45° Elbows
Ceiling Firestop