Heatiator ECO-ADV-WS22 I.Air Clearances, J. Thimble, Solid Pack Chimney with Metal Supports

I.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 ceiling or minimum recommended by chimney connector manu- facturer. Figure 37.1.

J. 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 minimum of 1 inch (25mm) from the exterior wall.

ceiling

Minimum18.0”

NFPA 211

17.0” OD 14.0” ID 8.0”

Center of Hole

Thimble

Include depth of hearth pad

C

L

	13.5” below ceiling to top
Wall	of opening
	or top of opening is a min.of
	4.5” below min.clearance
	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”
				1.0”
				C
				L
				1.0”
	1.5”	2.0”

• Wall spacer, trim collar and wall band to fit solid pack Figure 37.1 - Thimble Construction chimney selected.

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

Instructions:		Solid Pack Chimney with Metal Supports
1.	Open inside wall at proper height for the chimney con-
		as a Thimble
	nector to enter the masonry chimney. Figure 37.1.
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.			Fire Clay Flue
3.	Construct a 17 inch x 17 inch (432mm x 432mm) outside
				Liner
	dimension frame from 2 x 2 framing lumber to fit into wall			with Airspace
	opening. Inside opening of frame should be no less than			Masonry
	14 inch x 14 inch (356mm x 356mm). Figure 37.1.
		Trim Collar		Chimney
4.	Attach the wall spacer to the chimney side of the frame.	Chimney Section		Wall Spacer
5.	Nail the frame into the wall opening. The spacer should
		with 2 inch		Wall Band to
	be on the chimney side.	(51mm)
				Secure Chimney
		Clearance to
6.	Insert the section of the solid insulated chimney into the			Section
		Combustibles
	outer wall of the masonry chimney.	Chimney
7.	Tightly secure the length of the solid insulated chimney		Wood Studs Used
	with the wall band to the masonry chimney.	Connector	for Framing - Spaced
8.	Insert a section of chimney connector into the chimney.		2 inch (51mm)
			clearance from
	Make sure it does not protrude past the edge of the clay		Masonry Chimney
	chimney liner inside the chimney.
9.	Seal the end of the chimney connector to the clay liner
		Figure 37.2
	with refractory mortar.

10. Install trim collar around the sold pack chimney section.

Heatilator • ECO-ADV-WS22 • 7057-128C • August 13, 2010 37