9 Chase Installations

A. Construct the Chase

A chase is a vertical boxlike structure built to enclose the fireplace and/or its vent system. Vertical chimneys that run on the outside of a building must be installed inside a chase.

In cold climates, it is recommended that the chase insulated using batt type insulation between the joists.

Construction of the chase may vary with the type of build- ing. These instructions are not substitutes for the require- ments of local building codes. Local building codes MUST be checked.

Chases should be constructed in the manner of all outside walls of the home to prevent cold air drafting problems. The chase should not break the outside building envelope in any manner. All outer walls need to be insulated.

Building codes require false ceiling and ceiling firestops at each floor of the chase or every 10 ft (3.05 mm) of clear space to control spread of fire.

Walls, ceiling, base plate and cantilever floor at the first level of the chase should be insulated. See Figure 9.1 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.

Three examples of chase applications are shown in Figure 9.2

1.Fireplace and chimney enclosed in an exterior chase.

2.Chimney offset through exterior wall and enclosed in chase.

3.Chase constructed on roof.

All outside walls should be insulated.

1

2

3

Figure 9.2 Chase Constructions

Holes and other openings should be caulked with high tem- perature caulk or stuffed with unfaced fiber glass insulation.

 

 

 

Warning! You must install false ceilings and ceiling

 

 

 

firestops at each floor of the chase or every 10 ft (3.05 m)

Round Termination Cap

 

to control spread of fire.

 

 

 

 

 

Storm Collar

 

Warning! Risk of Fire! Do not seal area between fire

Metal Chase Top

 

 

Ceiling

 

stop opening and chimney pipe except where they enter

 

 

the attic or leave the warm air envelope of the home (use

 

Firestop

 

600° F sealant).

 

 

 

 

 

 

 

 

Warning! Risk of Fire! You must maintain a minimum

 

 

 

2 in. (51 mm) air space clearance to insulation and other

 

False Ceiling

 

materials surrounding the chimney system.

 

 

 

 

 

 

Attic

 

• Insulation and other materials must be firmly secured to

 

 

prevent accidental contact with chimney system.

Tabs

Insulation

 

 

• The chase must be properly blocked to prevent blown

Shield

 

 

 

 

Ceiling

Insulation in the

insulation or other combustibles from entering and

 

Firestop

outside walls

making contact with fireplace or chimney.

 

 

of the chase

 

Insulation

Insulation

 

• Failure to prevent contact between insulation or other

False Ceiling

False Ceiling

 

materials and chimney system may cause overheating

 

Chimney

 

and fire.

 

Figure 9.1

Chase Assembly

 

 

 

4/20/11

 

Heatilator • Constitution EPA Fireplace • 480-1091D

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Heatiator C40 owner manual Chase Installations, Construct the Chase

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