Installating Outside Air Kit

Nail Top Stand- offs

Nail Side

Nailing

Flanges

Vermont Castings EWF36A

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.

FP1197

Fig. 12 Fasten ﬁreplace in position.

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

Duct Termination Must be More Than 3’ Below Chimney

Duct Termi- nation

40’ Max.

Duct Run

Attic

Ceiling

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

Sofﬁt Termination

Exterior Wall
	40’ Max. Duct Run
Rain Cap
Duct Termina-
tion	Duct
	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.

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