Installing the Chimney System

Vermont Castings EWF36A

4. Attach the inlet collar with four (4) #10 screws to the

side near the bottom of the ﬁreplace. Slide the duct

over the collar and attach the duct to the collar using

the plastic tie straps or three (3) screws (screws not

Pipe Section

Pipe

Rim

provided). Continue attaching the ducting together

using three (3) screws at each joint until you have

installed sufﬁcient duct to arrive at your duct termina-

tion location.

5. At the termination end, install the duct termination.

This should be installed from the outside of the

home. Cut a hole in the desired location approxi-

mately 4¹⁄₂” in diameter, caulk around the hole, and

slide the termination through the opening from out-

side the home. The termination/rain cap should be

caulked around its perimeter to assure a tight seal.

The rain cap opening should be positioned down-

Pipe Hem

Hem

Lance

FP1198

ward. (Fig. 14)

The AK-MST Outside Air Kit is now installed and ready for use.

Caulking

Duct Termination

Rain Cap

Wall

FP1061

Fig. 14 Caulk and install duct termination/rain cap in place.

Start by attaching the ﬁrst chimney section to the collar on top of the ﬁreplace.

Install the pipe as pictured in Figure 15. When you get a good lock, you will hear the pipe clearly snap together. Once sections are snap-locked in place, it is extremely difﬁcult to get them apart. Make sure the pipe is ﬁrmly snapped and locked together as each pipe section is mounted.

When installing elbows, only outer pipe will snap- lock. Middle pipes simply slide into position. Be sure to always attach straps on upper elbow to a structural framing member. (Fig. 16)

Continue installing the pipe as required until pipe is installed up through the ceiling. At this point, you must

install a ﬁrestop spacer.

Fig. 15 Install pipe, listening for the snap-lock to fasten.
Elbow Strap	Support Structure

	Elbow Strap
	(must be tight)
	Ceiling Hole
	Framing
Angled Strap
	Angled Firestop
FP270/271	Chimney Support Strap
	(must be tight)

Fig. 16 Attach straps to a structural framing member.

Installing the Firestop Spacer

in the Ceiling Hole

A ﬁrestop spacer is used to keep pipe spaced properly and required for safety.

Nail the ﬁrestop spacer (at each corner) to the framing members of the ceiling hole. NOTE: A ﬁrestop spacer is not required at the roof.

Hole sizes listed in Figure 9 for angled ﬁrestop spacers provide minimum required air space to chimney pipe for ceiling thickness up to 8” (203mm). When combined thickness of ceiling material, ceiling joists and ﬂooring material exceeds 8” (203mm), adjustments must be made in framing to assure that minimum air spaces to chimney are maintained.

Proper Firestop Spacer Installation

Figure 17 shows different installation procedures for both an area that is an attic and an area that is not an attic.

20005167

Fig. 14 Caulk and install duct termination/rain cap in place.