9Chase Installations

A. 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 fiberglass

 

insulation. If the fireplace is being installed on a cement

 

fireplace and/or its vent system. Vertical chimneys that

 

slab, we recommend that in cold climates, a sheet of

 

 

 

 

 

 

 

 

run on the outside of a building must be installed inside a

 

 

 

 

 

 

 

 

plywood or other raised platform be placed underneath to

 

chase.

 

prevent conducting cold up into the room.

 

 

 

 

 

 

 

 

Construction of the chase may vary with the type of build-

 

 

 

 

 

 

 

 

Three examples of chase applications are shown in Fig-

 

ing. These instructions are not substitutes for the require-

 

ure 9.2.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ments of local building codes. Local building codes MUST

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

be checked.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1. Fireplace and chimney enclosed in an exterior chase.

 

 

 

 

 

 

 

 

A chase should be constructed in the manner of all outside

 

 

 

 

 

 

 

 

 

 

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

 

walls of the home to prevent cold air drafting problems. The

 

 

 

3. Chase constructed on roof.

 

 

 

 

 

 

 

 

chase should not break the outside building envelope in

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

any manner. All outer walls need to be insulated.

 

Note: In cooler climates, all chase walls should be insulated.

 

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.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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. Addi-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tionally, Hearth & Home Technologies recommends that the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

inside surfaces be sheet rocked and taped (or the use of an

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

 

 

2

 

 

 

 

 

 

 

3

 

 

 

 

 

equivalent method) for maximum air tightness.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 9.2

Chase Constructions

 

Termination Cap

Warning! You must install false ceilings and ceiling

 

 

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

Chase Top Flashing

m) to control spread of fire.

 

Ceiling

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

 

stop opening and chimney pipe except where they enter the

 

Firestop

 

 

attic or leave the warm air envelope of the home (use 600° F

 

 

sealant).

 

 

 

Warning! Risk of Fire! You must maintain a minimum

 

 

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

 

 

materials surrounding the chimney system.

 

 

• Insulation and other materials must be firmly secured to

 

False Ceiling

prevent accidental contact with chimney system.

 

• Failure to prevent contact between insulation or other

 

 

 

Attic

materials and chimney system may cause overheating

 

and fire.

 

Tabs

Insulation

 

Shield

 

 

 

 

 

 

Insulation in the

B. Install Fireplace & Chimney

 

outside walls

Insulation

of the chase

Install as per Sections 7 and 8.

Insulation

 

 

False Ceiling

False Ceiling

C. Install Chase Top Flashing

 

Chimney

Ceiling

 

• You MUST use a chase top flashing in a chase installation.

Firestop

 

Chase top flashings are available from your Hearth &

 

 

Home Technologies dealer or may be field constructed.

Figure 9.1

Chase Assembly

• Refer to Sections 8.M. and 8.N.

32

Heatilator • Birmingham BIR50-B • 4059-682C • 8/12

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Hearth and Home Technologies BIR50-B owner manual Chase Installations, Construct the Chase
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BIR50-B specifications

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