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VenTing insTallaTion
Continued
Figure 19 - Firestop Spacer with Living
Space Above Ceiling
Firestop
Spacer
Figure 20 - Firestop Spacer with Attic
Space Above Ceiling
10 FOOT RULE
All chimney terminations must extend a mini-
mum of 3 feet above the highest point where it
passes through the roof and must be at least 2
feet above roof with a 10 foot horizontal span
(see Figure 21).
IMPORTANT: If an exposed portion of chim-
ney is greater than 4 feet above the roofline,
use support wires to keep chimney secure.
Support wires may be attached to outer pipe
of chimney with screws, if screws do not
penetrate inner flue pipe.
Figure 21 - 10 Foot Rule
MINIMUM / MAxIMUM ChIMNEY
HEIGHT
The minimum height of the chimney (mea-
sured 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.)
115607-01C
Existing
Ceiling
Frame
Firestop
Spacer
Screws or
Staples
(Min. of 8)
Screws or Staples
(Min. of 8)
Existing
Ceiling
Frame
www.desatech.com
Uncommon circumstances such as neigh-
boring 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 chim-
ney run with this fireplace system is 40 feet
measured from bottom of fireplace to flue
outlet-end of pipe (see Figure 22).
WARNING: Do not oper-
ate an unvented gas log set in
this fireplace with the chimney
removed.
RTL-12D
RTL-12D STL-12D
Storm
Collar
Flashing
Minimum
Height
15 Ft.
Firestop
Spacer
Figure 22 - Maximum Chimney Height
Maximum
Height
Chase
Termination
50 Ft.
9
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