Hearth and Home Technologies HST-42D owner manual Chimney Requirements, Meters

A. Chimney Requirements

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

	ft	meters
• Minimum overall straight height	14	4.27
• Minimum height with offst/return	16.5	5.03
• Maximum height	90	27.43
• Maximum chimney length bewtween an offset	20	6.10
and return
• Maximum distance between chimney stabilizers	35	10.67
• Double offset/return minimum height	20	6.10
• Maximum unsupported chimney length between	6	1.83
the offset and return
• Maximum unsupported chimney height above the	35	10.67
fireplace
• Maximum unsupported chimney above roof	6	1.83

WARNING! Risk of Fire! You must maintain 2 in. (51

mm)air space clearance to insulation and other combus- tible materials around the chimney system. Failure to do so may cause overheating and fire.

Table 8.1

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 two pairs of offsets and returns 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 distribu- tion duct or system. These actions could cause over- heating/fire in the chimney flue, or release of exhaust fumes into the living areas.

HEIGHT OF CHIMNEY COMPONENTS		in.	mm
Chimney Stabilizer
	SL3	4-3/4	121
Ceiling Firestops
	FS338	0	0
	FS339	0	0
	FS340	0	0
Offsets/Returns
	SL315	13-3/8	340
	SL330	15-1/2	394
Roof Flashing
	RF370	0	0
	RF371	0	0
Chimney Sections*
	SL306	4-3/4	121
	SL312	10-3/4	273
	SL318	16-3/4	425
	SL324	22-3/4	578
	SL336	34-3/4	883
	SL348	46-3/4	1187
* Dimensions reflect effective height.

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

Ceiling firestop

47-1/4 in.

(1200 mm)

Effective

Height

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

35 ft (10.67 m) max. straight unsupported chimney height

16 ft (4.88 m) min. height (single offset-return) 20 ft. (6.10 m) min. height (double offset-return)

90 ft (27.4 m) max. height

Figure 8.2 Chimney Requirements

Heat & Glo • HST-42D • 27177 • Rev AB • 11/08 25