Hearth and Home Technologies 31M-ACC-MBK, 31ST-ACC Components, Air Clearances, Instructions

R

3100 Wood Stove Series (ACC)

Thimble

Site constructed for masonry chimney installation:

Components

•A minimum length of 12 inches [305mm] (longer for thicker walls) of solid insulated factory-built chimney length constructed to UL 103 Type HT 6 inch (152mm) inside diameter. Chimney needs to extend a minimum of 2 inches (51mm) from the interior wall and a mini- mum of 1 inch (25mm) from the exterior wall.

•Wall spacer, trim collar and wall band to fit solid pack chimney selected.

•Minimum 8 inch (203mm) diameter clay liner section (if not already present in chimney) and refractory mortar.

Air Clearances

•Masonry chimney clearance must meet NFPA 211 mini- mum requirement of 2 inches (51mm) to sheet metal supports and combustibles.

•Minimum of 1 inch (25mm) clearance around the chim- ney connector.

•Top of wall opening is a minimum of 13-1/2 inches (343mm) from ceiling or 4-1/2 inches (114mm) below minimum clearance specified by chimney connector manufacturer. NFPA 211 minimum vertical clearance of 18 inches (457mm) from chimney connector and ceil- ing or minimum recommended by chimney connector manufacturer. Figure 17.1.

Instructions:

C

L

	ceiling		13.5” below ceiling to top
		Wall	of opening
			or top of opening is a min.of
Minimum18.0”			4.5” below min.clearance
NFPA 211			specified by connector mfg.
			1.5	2x2 framing stud
			2.0	min air clearance
			1.0	min air clearance
			4.5
			1.5”		2.0”
17.0” OD 14.0” ID						1.0”
	8.0”					C
						L
						1.0”
			1.5”	2.0”
Center of Hole
Thimble

Include depth of hearth pad

Figure 17.1

Solid Pack Chimney with Metal Supports as a Thimble

1.	Open inside wall at proper height for the chimney con-
	nector to entry the masonry chimney. Figure 17.1
2.	Entry hole to masonry chimney must be lined with an 8
	inch (203mm) minimum diameter clay liner, or equiva-
	lent, secured with refractory mortar.
3.	Construct a 17 inch x 17 inch (432mm x 432mm) out-
	side dimension frame from 2 x 2 framing lumber to
	fit into wall opening. Inside opening of frame should
	be no less than 14 inch x 14 inch (356mm x 356mm).
	Figure 17.1.
4.	Attach the wall spacer to the chimney side of the
	frame.
5.	Nail the frame into the wall opening. The spacer should
	be on the chimney side.
6.	Insert the section of the solid insulated chimney into

Trim Collar

Chimney Section

with 2 inch

(51mm)

Clearance to Combustibles

Chimney

Connector

Fire Clay Flue

Liner

with Airspace

Masonry

Chimney

Wall Spacer

Wall Band to

Secure Chimney

Section

Wood Studs Used

for Framing - Spaced

2 inch (51mm) clearance from Masonry Chimney

the outer wall of the masonry chimney.

Figure 17.2

7.	Tightly secure the length of the solid insulated chimney		WARNING
	with the wall band to the masonry chimney.
			Fire Risk.
8.	Insert a section of chimney connector into the chimney.
	Make sure it does not protrude past the edge of the		Do NOT pack insulation or other combustibles between
			spacers.
	clay chimney liner inside the chimney.
			• ALWAYS maintain specified clearances around vent-
9.	Seal the end of the chimney connector to the clay liner		ing and spacers.
	with refractory mortar.		• Install spacers as specified.
			Failure to keep insulation or other material away from
10. Install trim collar around the sold pack chimney section.
			vent pipe may cause fire.
September 1, 2008		7033-277F	Page 17