Astria.us.com
126656-01_D
10
VENTING INSTALLATION
Continued
MINIMUM/MAXIMUM CHIMNEY HEIGHT
The minimum height of the chimney (measured from the base of the
fireplace to the flue gas outlet-end of pipe) is 16 feet for a straight run,
16 feet minimum for a run with 1 elbow set and 25 feet minimum for
a run with 2 elbow sets. (A set consists of one starter elbow and one
return elbow.)
Uncommon circumstances such as neighboring hills, tall trees, or
strong wind areas can cause down drafts in chimney system. In such
cases, going beyond the minimum recommended height would be
preferable to provide a better draw.
The fireplace height approved for any chimney run with this fireplace
system is 40 feet measured from bottom of firebox to flue outlet-end
of pipe (see Figure 22).
WARNING: Do not operate an unvented gas log
set in this fireplace with the chimney removed.
PENETRATING ROOF
To maintain a 2" clearance to pipe on a roof with a pitch, a rectangular
opening must be cut.
1. Determine center point where 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" one measure horizontally down from
roof rafters.
3. Use roof opening chart (Figure 23) 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 the
roof (see 10-Foot Rule and Figure 21, page 9.
Figure 22 - Maximum Chimney Height
Figure 23 - Roof Opening Measurements
FLASHING INSTALLATION
Determine flashing to be used with roof opening chart. Slide flashing
over pipe until base is flat against roof. Replace as many shingles as
needed to cover exposed area and flashing base. Secure in position
by nailing through shingles (see Figure 24).
DO NOT NAIL THROUGH
FLASHING CONE
.
Pitch
Slope Opening "A"
Max.
Used Flashing
Model No.
Flat
0°
19"
V6F-10DM
0-6/12 26.6°
23.25"
V6F-10DM
6/12-
12/12
45°
30.75"
V12F-10DM
Opening
“A”
19" Min.
(48.26cm)
30" Min.
(76.2cm)
2" Min.
(5.08cm)
2" Min.
(5.08cm)
2" Min.
(5.08cm)
Maximum
Height
Chase
Termination
50 Ft.
Minimum
Height
15 Ft.
Storm
Collar
Flashing
Firestop
Spacer
Minimum
Height 15 Ft.
(4.58 m)
Maximum
Height Chase
Termination
50 Ft.
(15.24 m)
RLT-12D
RLT-12D
STL-12D
