Hearth and Home Technologies 36, 42 owner manual Using Offsets/Returns, Chimney Offset/Return

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B. Using Offsets/Returns

To bypass any overhead obstructions, the chimney may be offset using an offset/return.

An offset and return may be attached together or a chimney section(s) may be used between an offset and return.

Perform the following steps to determine the correct chim- ney component combination for your particular installation:

WARNING

Fire Risk

Draft will be restricted if offsets/returns greater than 30° are used.

Measure how far the chimney needs to be shifted to enable it to avoid the overhead obstacle. See Figure 5.1. Use dimension “A” to determine chimney section required to achieve the needed shift.

After determining the offset dimension, refer to Table 5.2 and find the “A” dimension closest to but not less than the distance of shift needed for your installation.

The “B” dimension that coincides with the “A” dimension represents the required vertical clearance that is needed to complete the offset and return.

Read across the chart and find the number of chimney sections required and the model number of those particular chimney parts.

Whenever the chimney penetrates a floor/ceiling, a ceiling firestop must be installed.

The effective height of the fireplace assembly is measured from the base of the fireplace to the top of the starter collar. See Dimensions in Section 12.

Table 5.2

 

A

 

B

SL1106

SL1112

SL1118

SL1136

SL1148

in.

 

mm

in.

 

mm

SL406

SL412

SL418

SL436

SL448

4 7/8

 

124

17 7/8

 

454

-

-

-

-

-

7 1/4

 

184

2 2

 

559

1

-

-

-

-

9 3/4

 

248

26 1/8

 

664

2

-

-

-

-

10 1/4

 

260

27 1/4

 

692

-

1

-

-

-

 

 

 

 

 

 

 

 

 

 

 

12 3/4

 

324

31 3/8

 

797

1

1

-

-

-

13 1/4

 

337

32 3/8

 

822

-

-

1

-

-

 

 

 

 

 

 

 

 

 

 

 

15 3/4

 

400

36 5/8

 

930

-

2

-

-

-

18 1/8

 

460

40 3/4

 

1035

1

2

-

-

-

18 3/4

 

476

41 3/4

 

1060

-

1

1

-

-

21 3/4

 

552

47

 

1194

-

-

2

-

-

22 1/4

 

565

48

 

1219

-

-

-

1

-

 

 

 

 

 

 

 

 

 

 

 

24 3/4

 

629

52 1/8

 

1324

1

-

-

1

-

27 3/4

 

705

57 3/8

 

1457

-

1

-

1

-

 

 

 

 

 

 

 

 

 

 

 

28 1/4

 

718

58 3/8

 

1483

-

-

-

-

1

30 3/4

 

781

62 1/2

 

1588

1

-

-

-

1

 

 

 

 

 

 

 

 

 

 

 

33 3/4

 

857

67 3/4

 

1721

-

1

-

-

1

 

 

 

 

 

 

 

 

 

 

 

36 3/4

 

933

73

 

1854

-

-

1

-

1

39 3/4

 

1010

78 1/8

 

1984

-

-

-

2

-

 

 

 

 

 

 

 

 

 

 

 

41 1/8

 

1045

82 3/8

 

2092

1

-

-

2

-

45 3/4

 

1162

88 1/2

 

2248

-

-

-

1

1

 

 

 

 

 

 

 

 

 

 

 

48 1/8

 

1222

92 3/4

 

2356

1

-

-

1

1

51 3/4

 

1314

98 7/8

 

2511

-

-

-

-

2

Proper assembly of air cooled chimney parts results in an overlap of chimney joints of 1-1/4 in. (32 mm). Effective length is built into this table.

A

B

1-1/4 in. (32 mm)

OVERLAP

Figure 5.1 Chimney Offset/Return

Example: Your “A” dimension from Figure 5.3 is 14 1/2 in. (368 mm). Using Table 5.2 the dimension closest to, but not less than 14 1/2 in. (368 mm) is 15 3/4 in. (400  mm) using a 30° offset/return. It is then determined from the table that you would need 36 5/8 in. (930 mm) (Dimension “B”) between the offset and return. The chimney components that best fit your application are two SL1112s or SL412s.

Outdoor Lifestyles by Hearth & Home Technologies Inc. • Montana US-CAN4039-156 Rev K • 7/11

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Contents Fire Risk Hot glass will cause burnsListing Label Information/Location Serial Number GrateModel Table of Contents Listing and Code Approvals Appliance CertificationNot intended for use as a primary heat source Typical Fireplace System Design and Installation ConsiderationsGetting Started Moisture ResistanceTools and Supplies Needed Inspect Fireplace and ComponentsFire Risk Explosion Risk Exterior Walls see Figure Freestanding Installations see FigureFraming and Clearances Selecting Fireplace LocationEnclosed Fireplace Clearances to Combustible Materials ClearancesFrame the Fireplace Sidewalls/SurroundsChimney Requirements Installation of Fireplace Install the Dual Cooling Air KitSharp Edges Asphyxiation Risk Position the Fireplace Secure the FireplaceHeight of Chimney Components Chimney AssemblyChimney Offset/Return Using Offsets/ReturnsAssemble the Chimney Sections Install the Ceiling Firestops in./19 mm in length Install the Attic Insulation ShieldDouble-check the Chimney Assembly Secure the ChimneyChimney Termination Complete the EnclosureMark the Exit Point of the Roof Chase TopST1175/ST475 Square Termination Cap Install the Termination CapTCT1175 Terra Cotta Cap Accessories Gas Log/Lighter ProvisionsGas Code, Ansi Z223.1 Hearth Extension FinishingFinishing Material MantelGlass Doors General Information Operating InstructionsFirescreen Outside AirClear Space Near the Fireplace Flue DamperWood Fuel GrateStarting a Fire Diagnostics and Problem Solving TroubleshootingFirebox Refractory Maintenance and Servicing the FireplaceChimney Inspection/Cleaning Disposal of AshesChimney Fire Maintenance Task ListWhen cleaning glass door CleanReference Materials Fireplace DimensionsDescription Fireplace ComponentsCatalog # Chimney ComponentsAssembled Diameter 17 in./432 mm Height 24 in./610 mm 15-3/4 400 mm 635 x 635 mm 584 x 584 mm 737 x 737 mm Woodburning Termination CapMONTANA-36, MONTANA-36H D. Service PartsMONTANA-42, MONTANA-42H Service PartsThis page intentionally left blank This page intentionally left blank Warranty Coverage This warranty is void if Limited WarrantyRO N a CO ISD D