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Vermont Castings EWF36A
20005167
Installating Outside Air Kit
An outside air kit may be installed on the EWF36A. If
desired, or if local codes mandate the use of an air kit,
then two (2) AK-MSTs are required to complete the
installation (from air kit to the outdoors). If the outside
air kits are to be used, the AK-MSTs MUST be installed
BEFORE the fireplace is enclosed.
NOTE: Four (4) inch Class 1 air duct, material or metal
duct (not supplied) may be used with AK-MST. (For
installation in New York State, only aluminum, non-
combustible flexible or type “O” metal ducting is
permissible.)
Installation Precautions
The duct termination should be located so it is exposed
to an out-of-doors opening at least 100 square inches. If
the duct termination must be located in a crawl space or
basement, be sure the termination area has 100 square
inches of ventilation opening to outside air.
The duct termination must be located so it does not
compete for air flow with exhaust fans, gas vent hoods
or other air consuming devices or appliances. It must
not be obstructed by rafters, insulation materials or
other obstructions. The less restrictive the air supply,
the better the AK-MST will perform.
It is a good practice to protect your hands and eyes
during installation by wearing work gloves and safety
glasses.
CAUTION: Do not install termination into a garage
or other area that could contain flammable liquids
or fumes, or into an attic space.
Installation Instructions
Determine the location of the fireplace as described
in the fireplace Installation Manual. Then plan location
of the duct termination and the route of the duct run
between the fireplace and the duct termination.
Duct run must be limited to a maximum distance of 40
feet from the fireplace pipe collar to duct termination.
This will provide the least restriction to air flow. No more
than four (4) 90° elbows can be used. Duct run may
be horizontal, vertical, inclined or any combination of
these. Vertical duct runs must be at least three (3) feet
below the fireplace chimney flue exit. (Fig. 13) You are
now ready to install the AK-MST Outside Air Kit.
FP1060
AKMST installation
7/6/00 djt
Duct Termination
Must be More Than 3’
Below Chimney
40’ Max.
Duct Run
Duct Termi-
nation
Ceiling
Attic
Duct
Soffit Termination
Exterior Wall
Rain Cap
Duct Termina-
tion
40’ Max. Duct Run
Duct
Exterior Wall Termination
FP1060
Fig. 13 Typical installations.
1. Remove and discard the outside air cover plate
located at the center of both sides of the fireplace.
Use care not to rub against the sharp edges of this
opening to avoid cuts. Remove the four (4) screws
exposed when cover plate is removed. Retain for
future use.
2. Slide the two (2) connecting boxes provided with the
unit into the openings on each side of the unit.
3. Attach the connecting boxes to the inside panel with
four (4) screws removed in Step 1.
Fig. 12 Fasten fireplace in position.
Nail Top Stand-
offs
Nail Side
Nailing
Flanges
FP1197
FP1197
EPA36
nailing flanges
3/20/02 djt