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Vermont Castings EWF30
20008662
Installing Outside Air Kit
An outside air kit may be installed on the EWF30.
The AK-MST allows for 100% of required combustion
air to come from outside source. If desired, or if local
codes mandate the use of an air kit, then an AK-MST
is required to complete the installation (from air kit to
the outdoors). If the outside air kit is to be used, the
AK-MST 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
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.
below the fireplace chimney flue exit. (Fig. 13) You are
now ready to install the AK-MST Outside Air Kit.
1. Remove the outside air cover plate located at the
center of the right side of the fireplace. Carefully
insert the cover plate into the opening and cover the
air inlet opening in the bottom of the firebox. (Fig.
14) Use the screws removed from cover plate to
secure cover plate over opening. Use care not to
rub against the sharp edges of this opening to avoid
cuts.
FP1565
EWF30
nailing flanges
3/05 djt
Fig. 12 Fasten fireplace in position.
Nail Top
Standoffs
Nail Side
Nailing
Flanges
FP1565