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INSTALLATION PROCEDURES

for FPI Direct Vent System (Flex)

Page 2 of 2

918-211c

502-

DIRECT VENT GAS FIREPLACE

09/22/08

thimble halves slip inside each 
other and can be adjusted for 2 x 
4 or 2 x 6 walls. 

The liners must 

slip over the collars a minimum 
of 1-3/8".

5)

  Attach the vinyl siding standoff 

(mandatory for vinyl siding) to 
the exterior wall. Ensure that the 
holes in the standoff are positioned 
at top/bottom to allow for proper 
drainage. Note: If exterior wall is 
not vinyl siding, read below.

Note: If installing termination on a 

non-vinyl siding covered wall,  
f u r r i n g 
s t r i p s 
must be 
used to 
e n s u r e 
that the 
termina-
tion is not 
recessed 
into the 
siding.

6)

  Slip the assembled liner and ter-

mination assembly through the 
thimble making sure the termina-
tion cap faces up (there are mark-
ings on the cap that show which 
way is up). This will position the 

IMPORTANT: Maintain top, side and 
bottom clearances around the pipe. 
See specifi c unit installation manual 
for proper clearances.

1)

  Locate the unit in the framing, 

rough in the gas (preferably on 
the right side of the unit) and the 
electrical (Junction block is on 
the left side) on the left. Locate 
the centerline of the termination 
and mark wall accordingly. Cut a 
11"(279mm) hole in the wall (inside 
dimension).

Note: We  recommend framing a 

11"(279mm) x 11"(279mm) 
(inside dimensions) hole to 
give structural rigidity for 
mounting the termination.

2)

 Level 

the 

fi replace and fasten it to 

the framing using nails or screws 
through the nailing strips.

3)

  Assemble the vent assembly by 

applying Mill Pac to the 5"(27mm) 
inner collar of the termination and  
slipping the 5"(27mm) liner over it 
at least 1-3/8" (35mm). Fasten with 
the 3 screws (drilling pilot holes will 
make this easier). Apply Mill Pac 
or high temperature silicone to 
the 8"(203mm) fl ex pipe and slip it 
over the 8" outer collar of the vent 
terminal at least 1-3/8"(35mm) and 
fasten with the 3 screws.

NOTE:  Horizontal sections must 

be supported at intervals not 
exceeding 3 feet (0.9 meter). 
(Flame picture and perform-
ance will be affected by sags 
in the liner).

4)

  Separate the 2 halves of the wall 

thimble and securely fasten the 
one with the tabs to the outside wall 
making sure that the tabs are on 
top and bottom. Fasten the other 
thimble half to the inside wall. The 

termination cap with proper down 
slope for draining water. Fasten 
the cap to the outer wall with the 
4 supplied screws. 

7)

  Pull the centre 5"(127mm) liner and 

outer 8"(203mm) liner out enough 
to slip over the fl ue collars of the 
fi replace.  (You may wish to cut 
the liner shorter to make it more 
workable.) Do not bend liner more 
than 90

o

.

8)

  Apply Mill Pac over the fi replace 

inner collar and slip the 5"(127mm) 
liner down over it and attach with 
3 supplied screws.

9)

  Do the same with the 8"(203mm) 

liner.

10)

  Apply a bead of silicone between 

the thimble and termination and 
around the outer edge of the ter-
minal at the wall in order to keep 
the water out.

IMPORTANT: Do not locate termination 
hood where excessive snow or ice buildup 
may occur. Be sure to check vent termi-
nation area after snow falls, and clear to 
prevent accidental blockage of venting 
system. When using snow blowers, make 
sure snow is not directed towards vent 
termination area.

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