Horizontal Vent Table - Marquis Infinite MQRB4436N Installation Instructions Manual

Seal with High Temperature Mill Pac Sealant
Figure 1 - Flex pipe spring spacing guide.
Horizontal runs require support metal straps every 2ft. In an offset installation support straps should be used to stabilize pipe.
Expand inner and outer flex pipe to the point that the outer flex pipe protrudes approximately 2 to 3 inches past outer wall and
the inner flex protrudes approximately 2 to 3 inches past the outer flex pipe. Attach the inner flex pipe to the termination first and
secure with sealant and [4] screws. Then attach the outer flex pipe to the termination with caulking and screws. Termination may
then be moved back to the outer wall and attached to home screwing into the framing. Use silicone around the termination to
provide waterproof seal. If siding shield is going to be used attach this after termination has been caulked for waterproofing.
Apply a bead of Mill Pac high temp sealant to all joints and use four screws to secure each pipe at fireplace, termination and
any joint if joining any sections of pipe.
NOTE: It is critical to the proper and safe operation of this fireplace that on all connections the inner liner and the outer casing
are both caulked with liberal amounts of sealant. Do not use any kind of tape or silicone other than that recommended in this
manual. Mill Pac Sealant
Venting Routes and Components
Since it is very important that the vent system maintain its balance between the combustion air intake and the flue gas
exhaust, certain limitations as to vent configurations apply and must be strictly adhered to. The table on the following page
showing the relationship between vertical and horizontal side wall venting will help to determine the various vent lengths.
The maximum horizontal run with the 90 degree bend at the fireplace flue outlet is 3'. The maximum horizontal run is 20ft
when the vertical run is 8ft. Note: 1/4" vertical rise is required for every 12" of horizontal run (see Horizontal Vent Table).
Two additional 90° bends (or the equivalent) are allowed in the horizontal run. The horizontal run must be reduced 36" for each
90° bend. The horizontal run must be reduced 18" for each 45° bend.
The maximum vertical run is 43ft [13.1m].
Special Note: For each 45 degree bend installed in the horizontal run, the length of the horizontal run must be
reduced by 18" [46cm]. This does not apply if the 45 degree bends are installed on the vertical part of the vent
system.
Example
If the length of the horizontal run is 10ft [3m], and two 45 degree bends are required, then the horizontal run length must be
reduced to 7ft to achieve proper venting. If 10ft of horizontal run is required in conjunction with the two 45 degree bends, then
the vertical run must be reduced appropriately. Please refer to Horizontal Vent Table for the relationship between horizontal
and vertical runs.
IMPORTANT: Always locate the fireplace in such a way that a minimum of offsets and/or horizontal runs are required.
1/4" vertical rise is required for every 12" horizontal run.
Use High Temperature Mill Pac Sealant
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