A. Chimney Requirements

Measure vertical distances from the base of the fireplace as shown in Figure 8.2.

• Minimum overall straight height

18 ft

(5.5 m)

• Minimum height with offset/return

18.5 ft

(5.64 m)

Maximum height

90 ft

(27.43 m)

• Maximum chimney length between an offset

20 ft

(6.1 m)

 

and return

 

 

Maximum distance between chimney

35 ft

(10.67 m)

 

stabilizers

 

 

• Maximum unsupported chimney length

6 ft

(1.83 m)

 

between the offset and return

 

 

• Maximum unsupported chimney height above

35 ft

(10.67 m)

 

the fireplace

 

 

Maximum unsupported chimney above roof

6 ft

(1.83 m)

WARNING! Risk of Fire! You must maintain 2 in. (51 mm) air space clearance to insulation and other combustible materials around the chimney system. Failure to do so may cause overheating and fire.

Determine the chimney components needed to complete your particular installation:

Measure the total vertical height of the fireplace installation from the base of the fireplace assembly to the approximate location of the bottom of the termination cap.

Subtract the effective height of the fireplace assembly (see Figure 8.2) from the total vertical height to determine the overall height of the chimney installation.

Create a schematic for your application similar to Figure 8.2 showing components required (referring to Table 8.1). Figure 8.1 identifies those components and where used.

Install a ceiling firestop whenever the chimney penetrates a floor/ceiling.

NOTICE: A maximum of one offset and return may be used.

CAUTION! Risk of Fire and/or Asphyxiation! DO NOT connect this fireplace to a chimney flue servicing another appliance. Do NOT connect to any air distribution duct or system. These actions could cause overheating/fire in the chimney flue, or release of exhaust fumes into the living areas.

Table 8.1

HEIGHT OF CHIMNEY COMPONENTS

in.

mm

Chimney Stabilizer

 

 

 

SL11

4-3/4

121

Ceiling Firestops

 

 

 

FS538

0

0

 

FS540

0

0

 

 

 

 

Offsets/Returns

 

 

 

SL1130

18

457

Roof Flashing

 

 

 

RF570

0

0

 

RF571

0

0

 

 

 

 

Chimney Sections*

 

 

 

SL1106

4-3/4

121

 

SL1112

10-3/4

273

 

 

 

 

 

SL1118

16-3/4

425

 

SL1136

34-3/4

883

 

SL1148

46-3/4

1187

* Dimensions reflect effective height.

 

 

20 ft (6.10 m) max. pipe between an offset & return

Ceiling firestop

97 1/2 in.

(2477 mm)

Effective

Height

6 ft (1.83 m) max. unsupported chimney above roof

35 ft (10.7 m) max. straight unsupported chimney height

14-11

18.5 ft (5.64 m)

Transition

min. height

 

single offset-return

 

90 ft (27.4 m)

 

max. height

Figure 8.2 Chimney Requirements

Heatilator • Birmingham BIR42 • 4059-308 F • 11/08

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Hearth and Home Technologies BIR42 owner manual Chimney Requirements, Height of Chimney Components