29
OPTIONAL OUTSIDE AIR KIT (MODEL MFP-AK/F)
The installation of an outside air kit should be performed during
the rough framing of the fireplace due to the nature of it’s
location. Outside combustion air is accessed through a vented
crawl space (MFP4-AKF) or through a sidewall (MFP4-AK).
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!
CAUTION:
Combustion air inlet ducts shall not
terminate in attic space.
The maximum height for the air vent cannot exceed
3 feet below the flue gas outlet of the termination.
Figure 65
Secure to Collars with Metal Tape, Screws
or Straps (Min. of 1/4” x 20” in size)
Vent Hood Required
for Wall Installation
Air Inlet location
must allow for
bushes or snow
Vented Crawl Space
(check local codes
before installing in a
Vented Crawl Space)
CHIMNEY PIPE
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!
WARNING:
Label part number 900599-01 must be
applied by the installer to all chimney pipe sections but
is not required on sections that will be visible after the
installation is complete. Label must wrap around the
circumference of the pipe. See accessories, page 25 for
Kit F2659.
The IHP chimney system consists of 12”, 18”, 24”, 36” and 48”
snap-lock, double-wall pipe segments, planned for maximum
adaptability to individual site requirements. Actual lengths
gained after fitting overlaps must be taken into consideration
(lineal gain) and are given in the lineal gain chart (see Figure 8).
Lineal Gain is the actual measurable length of a part after two
or more parts are connected. For Canada, use chimney parts
designated “HT”.
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!
WARNING:
The opening in the collar around the
chimney at the top of the fireplace must not be obstructed.
Never use blown insulation to fill the chimney enclosure.
LINEAL GAIN
PART NO.
DESCRIPTION
GAIN
Mason-Lite
Fireplace
66-1/2”
12-12DM
Pipe Section
10-5/8”
12-12HT
18-12DM
Pipe Section
16-5/8”
18-12HT
24-12DM
Pipe Section
23-5/8”
24-12HT
36-12DM
Pipe Section
34-5/8”
36-12HT
48-12DM
Pipe Section
46-5/8”
48-12HT
RLT-12D
Round Termination
7-3/4”
RLT-12HT
STL-12D
Square Chase-Top
with Slip Section
7” to 15” *
* The lineal gain for the terminations is measured to the flue gas
outlet height.
Figure 65
15” Galvanized
Outer Pipe
12 3/8”
Stainless
Inner Pipe
Hemmed End
ASSEMBLY AND INSTALLATION OF DOUBLE WALL CHIMNEY
SYSTEM
Each double wall chimney section consists of a galvanized
outer pipe, a stainless steel inner flue pipe and a wire spacer.
The pipe sections must be assembled independently as the
chimney is installed. When connecting chimney directly to
the fireplace, the inner flue pipe section must be installed first
with the lanced side up. The outer pipe section can then be
installed over the flue pipe section with the hemmed end up.
Press down on each pipe section until the lances securely
engage the hem on the fireplace starter. The wire will assure
the proper spacing between the inner and outer pipe sections.
Continue to assemble chimney sections as outlined above,
making sure that both the inner and outer pipe sections are
locked together. When installing double wall snap-lock chimney
together, it is important to assure the joint between the chimney
sections is locked. Check by pulling chimney upward after
locking. The chimney will not come apart if properly locked. It
is not necessary to add screws to keep the chimney together
(exception: see Figure XX, Page XX).
The height of a vertical chimney pipe supported ONLY by the
fireplace, must not exceeed 20 feet. Chimney heights above 20
feet must be supported.