Heatiator I80 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 fire-	high temperature caulk or stuffed with unfaced fiberglass in-
	sulation. If the fireplace is being installed on a cement slab,
place and/or its vent system. Vertical chimneys that run on
	we recommend that in cold climates, a sheet of plywood or
the outside of a building must be installed inside a chase.
	other raised platform be placed underneath to prevent con-
Construction of the chase may vary with the type of build-
	ducting cold up into the room.
ing. These instructions are not substitutes for the require-	Three examples of chase applications are shown in Fig-
ments of local building codes. Local building codes MUST
	ure 3.6.
be checked.
Chases should be constructed in the manner of all outside
	1. Fireplace and chimney enclosed in an exterior chase.
walls of the home to prevent cold air drafting problems. The
	2. Chimney offset through exterior wall and enclosed in
chase should not break the outside building envelope in any
	chase.
manner. All outer walls need to be insulated.
	3. Chase constructed on roof.
Building codes require false ceiling and ceiling firestops at
each floor of the chase or every 10 ft (3.05 m) of clear space
to control spread of fire.	All outside walls should be insulated.

Walls, ceiling, base plate and cantilever floor at the first level of the chase should be insulated. See Figure 3.5. Vapor and air infiltration 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 surfac- es be sheet rocked and taped (or the use of an equivalent method) for maximum air tightness.

Round Termination Cap				1	2		3
Metal Chase Top				Figure 3.6	Chase Constructions
	Ceiling
	Firestop		F. Chimney Requirements
			When planning your fireplace location, the chimney con-
			struction and necessary clearances must be considered.
			The fireplace system and chimney components have been
			tested to provide flexibility in construction. Vertical distances
			are measured from the base of the fireplace as shown in
			Figure 5.2.
	False Ceiling					ft	m
	Attic		•	Minimum overall straight height		18	5.5
			•	Minimum height with offset/return		18.5	5.6
Tabs	Insulation
	Shield		•	Maximum height		90	27.4
		Insulation in the
	Ceiling		•	Maximum chimney length between an offset and		20	6
		outside walls
	Firestop
		of the chase		return
Insulation	Insulation		•	Maximum distance between chimney stabilizers		35	10.7
False Ceiling	False Ceiling		•	Double offset/return minimum height		24	7.3
	Chimney		•	Maximum unsupported chimney length between the		6	1.8
				offset and return
			•	Maximum straight unsupported chimney height		35	10.7
				above the fireplace
Figure 3.5	Chase Assembly		•	Maximum unsupported chimney above roof		6	1.8
				Note: A maximum of two pairs of offsets and returns may
				be used.
12		Heatilator • I80 CAN-US • 4013-203 Rev F • 04/08