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For more information, visit www.desatech.com
For more information, visit www.desatech.com
Roof Opening Chart
PITCH Opening “A” Use Flashing
(degrees) Max. (inches) Model Number
FLAT 19 6F-10
0-6/12 23
1
/4 6F-10
(26.6 deg. Slope)
6/12-12/12 30
3
/4 12F-10
(56.3 deg. Slope)
12/12/-18/12 40
1
/8 18F-10
(56.3 deg. Slope)
WARNING: Do not operate an unvented gas log
set in this fireplace with the chimney removed.
Chimney Maintenance
Have your chimney system cleaned and inspected regularly to
ensure safe and efficient operation.
Using Figure 24 and the roof opening chart below, determine the
opening that will be required for the pitch of your particular roof.
Figure 25 - Roof Opening
FINISHING YOUR CHIMNEY SYSTEM
Maximum Chimney Height (Cont.)
Chimney Maintenance
MINIMUM
HEIGHT
15 FT.
(4.5m)
MAXIMUM
HEIGHT
CHASE
TERMINATION
40 FT.
(12m)
VENTING INSTALLTION
Continued
Figure 24 - Maximum Chimney Height
Firestop
Spacer
Flashing
Storm
Collar
RTL-10DM RTL-10DM ETL-10DM
Firestop
Spacer
30°
Firestop
Spacer
30° Offset/
Return
Before cutting hole, temporarily remove shingles around area to be
opened. After preparing the opening on the roof, continue to add
sections of pipe until it extends a minimum of 30 inches above
highest point of roof cutout (see Figure 25).
With the termination, the minimum height should add up to 3 feet
(see 10-Foot Rule and Figure 22, page 10).
Opening
A
19" Min.
(48.26cm)
30" Min.
(76.2cm)
2" Min.
(5.08cm)
2" Min.
(5.08cm)
2" Min.
(5.08cm)