Hearth and Home Technologies ST42A owner manual Construct the Chase, Chimney Requirements

E. Construct the Chase	Gas line holes and other openings should be caulked with
A chase is a vertical boxlike structure built to enclose the	high temperature caulk or stuffed with unfaced fi berglass in-
fi replace and/or its vent system. Vertical chimneys that run	sulation. If the fi replace is being installed on a cement slab,
on the outside of a building may be, but are not required to	we recommend that in cold climates, a sheet of plywood or
be, installed inside a chase.	other raised platform be placed underneath to prevent con-
	ducting cold up into the room.
Construction of the chase may vary with the type of build-
	Two examples of chase applications are shown in Fig-
ing. These instructions are not substitutes for the require-
ments of local building codes. Local building codes MUST	ure 3.6.
be checked.
	1. Chimney offset through exterior wall and enclosed in
Chases should be constructed in the manner of all outside
	chase.
walls of the home to prevent cold air drafting problems. The
	2. Chase constructed on roof.
chase should not break the outside building envelope in any
manner.

Building codes require false ceiling and fi restop spacers at each fl oor of the chase or every 10 ft (3.05 m) of clear space to control spread of fi re.

Walls, ceiling, base plate and cantilever fl oor at the fi rst level of the chase should be insulated. See Figure 3.5. Vapor and air infi ltration barriers should be installed in the chase as per regional codes for the rest of the home. Additionally, Hearth

&Home Technologies recommends that the inside surfaces be sheet rocked and taped for maximum air tightness.

Round Termination Cap					1	2
Metal Chase Top			Figure 3.6		Chase Constructions
Firestop
Spacer			F. Chimney Requirements
			When planning your fi replace location, the chimney con-
			struction and necessary clearances must be considered.
			The fi replace system and chimney components have been
			tested to provide fl exibility in construction. Vertical distances
			are measured from the base of the fi replace as shown in
False Ceiling			Figure 5.2.
							ft	meters
			a.	Minimum overall straight height			14.0	4.27
		Attic	b.	Minimum height with offset/return			16.5	4.93
			c.	Maximum height			90.0	27.43
Tabs		Insulation
		Shield	d.	Maximum chimney length between an offset and			10.0	3.05
		Firestop		return
		Spacer	e.	Maximum distance between chimney stabilizers			35.0	10.67
Insulation		Insulation	f.	Double offset/return minimum height			22.0	6.71
False Ceiling		False Ceiling	g.	Maximum unsupported chimney length between the			6.0	1.83
		Chimney		offset and return
			h.	Maximum unsupported chimney height above the			35.0	10.67
				fi replace
Figure 3.5	Chase Assembly		i.	Maximum unsupported chimney above roof			6.0	1.83
12			Heatilator • ST42A • 35038 Rev G • 02/05