Monessen Hearth BUF400, BUF500 manual for use of optional ak-4outside air kit, located. See Figure

for use of optional ak-4 outside air kit

The use of outside air for combustion is optional unless required by building codes. It is only necessary to supply outside combustion air to one side of the fireplace. Use the model AK4 combustion air kit.

Model AK-4 Combustion Air Assembly

1.Remove the cover plate from the 4" outlet opening location on the left or right outside of the fireplace.

2.Place the insulation ring between the AK-4 starting collar and fire- place wall.

WARNING

DO NOT remove the cover if the outside air will not be connected.

3.Place the starting collar (4") into the hole on the side of fireplace. Fasten it in place with the four sheet metal screws provided. See Figures 18 and 19.

Note: The air starting collar extends through the fireplace outer wrap. When the air starting collar is securely attached, it will form a seal against the fireplace wall.

4. Attach outside duct to starting collar with duct clamp or screws. See Figure 19.

	Left Side of	Insulation Ring
	Fireplace				Screws		Air Starting
			AK-4 Starting
							Collar
			Collar
							Duct
			Sheet
			Meal
			Screws
		Shorter End				Left Side of
						Fireplace
		of Air Starting
		Collar			Figure 19 - Attaching Outside Duct
Figure 18 - Attaching Outside Air Starting Collar						to Starting Collar
	and Insulation Ring to Left Side of Fireplace				6" Diameter
5. Cut a 6-inch diameter opening for model AK-4 in the					Hole		Screw
	outside wall covering where the outside vent is to be
	located. See Figure 20.						Nail
6. Select and cut a piece of duct long enough to attach
							Holes
	to the fireplace and stick out at least 3" beyond the
	face of the wall to which the AK-4 inlet air vent will be				Duct
	attached. See Figure 19.			Extending
WARNING					3"min.
	Use FP-4 U duct for maximum efficiency					AK-4 Inlet
	and safety. Do not use a combustible					Air Vent	Screws
	duct. Always use UL Listed Class 0 or
	1 duct material.				Figure 20 - Combustion Air Assembly for
						Model No. AK-4
							Continued

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