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Using 90
°
Elbows When the Initial Starter Vertical Section Is Less Than 4'
For vent systems that provide a starting vertical section less than 4' the following rules apply:
A. You must use the Master Venting Requirements Chart.
B. A single 90° vertical-to-horizontal elbow is already calculated into the allowable maximum horizontal run. The Venting
Requirements Chart assumes that for all horizontal runs calculated, one 90
Note: Each additional 90° elbow reduces the maximum horizontal distance allowed by 3'.
C. If you plan to use more than one 90
calculate the maximum horizontal run you are allowed based on the first vertical section connected directly to the
fireplace. From this maximum horizontal run calculated, subtract 3' for each additional 90
Caution: If a vertical-to-horizontal discharge elbow or a horizontal-to-horizontal discharge elbow is enclosed within a wall, floor or
ceiling, a top air space clearance of 2" must be maintained above the entire body of the elbow.
Using 45-Degree Elbows
Two 45-degree elbows may be used in place of one 90-degree elbow. On 45-degree runs, one foot of diagonal pipe is equal to
8-1/2 inches horizontal run and 8-1/2 inches vertical run. Two 45-degree elbows may be connected directly to the vent starter
adapter on this fireplace to create an offset to provide the required clearances to combustible framing or sheathing materials.
Two 45-degree elbows may be connected directly to the top of this fireplace to create a horizontal offset. 12 feet maximum
horizontal run allowed with this offset configuration only if the first vertical section connected directly to the last 45-degree
elbow is more than 4 feet to 25 feet long. For maximum allowable horizontal distances with the 45-degree offsets, see the
Master Venting Configuration Chart.
Note: Each horizontally positioned 45º elbow reduces the maximum horizontal distance by 1½ '.
SUPPORT: Horizontal runs of pipe will require one vent support for every 3 ft. of pipe.
Minimum Rise Horizontal Termination
The minimum vertical section required to be connected directly to the starter adapter on this fireplace is 12". With a 12"
vertical starter section, a 6" horizontal run to a horizontal vent cap is allowed. If the total length of the vertical sections
connected directly to the starter adapter on this fireplace is between 4' and 25', you are allowed a maximum 12' horizontal run.
This fireplace provides a maximum flexibility in the use of 90
to the starter collar. If 4' or more vertical section is connected to the starter collar, you may use three 90° elbows for horizontal
terminations. For other venting configurations within these maximum limits, see Master Venting Chart.
Combined total length of all pipe sections in the vent system should be less than 41'.
NOTE: The horizontal run of vent pipe must be level or have a ¼" rise for every 1' of run toward the
termination. Never allow the vent to run downward. This will cause high temperatures and the possibility
of a fire.
Follow these steps to install venting:
1. Position fireplace in desired location. Check to determine if wall studs are in the way when vent system is attached. If this is the
case you may want to adjust the fireplace location.
2. Locate where vent pipe will pass through any ceilings and will penetrate the outside wall. Since vent pipe sections "overlap,"
we suggest pre-assembling and measuring the total vent pipe run so you can more accurately locate the point where the vent
pipe will penetrate the outside wall. Be sure all vent components are properly twist locked and leak-proof.
3. Cut and frame a 9" wide x 10" high opening in the outside wall openings and 9" x 9" opening in ceiling openings. The outside
wall hole must be positioned so the vent system will have a ¼" rise per foot on horizontal runs and be perpendicular to the
wall. The height of the opening must be located to meet all building codes and not allow the termination to be easily blocked
or obstructed. A ceiling fire stop spacer is required at any floor (ceiling) opening.
4. The horizontal pipe must end flush with the exterior wall of the home. Horizontal pipe will require a proper support every 3' of
vent pipe. There must be a minimum of 1" clearance to combustibles from all vent pieces on the sides and bottom and 2"
above horizontal runs.
5. A wall thimble must always be used when penetrating combustible wall materials.
85-03-01116
°
elbow within the vent system, first use the Venting Requirements Chart and
°
elbows when more than 4' of vertical starter section is connected
DXV42 TIMBERFIRE
elbow is used within the venting system.
0
elbow you will use.
°
Page 56
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