Hearth and Home Technologies HST-42D owner manual Using Offsets/Returns, Example

Page 26

B. Using Offsets/Returns

•Use an offset/return to bypass overhead obstructions.

•An offset and return can be used as a single entity or separated by chimney section(s).

WARNING! Risk of Fire! DO NOT use offset/returns greater than 30°. Chimney draft will be restricted and could cause overheating and fire.

•Measure the shift needed to avoid the overhead obstruction. Refer to dimension A in Figure 8.3.

•Find the appropriate A dimension listed in Table 8.2.

•The B dimension coinciding with the A dimension measurement in Table 8.2 represents the required vertical clearance needed to complete the offset/return.

•Read across the chart to find the number of chimney sections/model numbers needed between the offset and return.

A

B

1-1/4 in. (32 mm)

OVERLAP

Figure 8.3 Chimney Offset/Return

Example:

Your “A” dimension from Figure 8.3 is 14 1/2 in. (368 mm). Using Table 8.2 the dimension closest to, but not less than 14 1/2 in. (368 mm) is 14 1/2 in. (368 mm) using a 30° offset/return.

You determine from the table that you need 34 1/8 in. (867 mm) (Dimension “B”) between the offset and return.

The chimney component that best fits your applica- tion is one SL324.

Table 8.2

 

 

15-degree

 

 

 

 

 

 

 

 

 

 

30-degree

 

 

 

A

 

B

 

 

 

 

 

 

 

A

 

B

Offset

Height

 

 

 

 

 

 

Offset

Height

in.

 

mm

in.

 

mm

SL306

SL312

SL318

SL324

SL336

SL348

in.

 

mm

in.

 

mm

1-5/8

 

41

13-3/8

 

340

-

-

-

-

-

-

3-5/8

 

92

15-1/2

 

394

2-7/8

 

73

17-3/4

 

451

1

-

-

-

-

-

5-1/2

 

140

18-5/8

 

473

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4-1/8

 

102

22-3/8

 

568

2

-

-

-

-

-

7-1/4

 

184

21-3/4

 

552

4-1/2

 

114

23-5/8

 

600

-

1

-

-

-

-

8-1/2

 

216

23-3/4

 

603

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5-3/4

 

146

28-1/4

 

718

1

1

-

-

-

-

10-1/4

 

260

27

 

686

6

 

152

29-3/8

 

746

-

-

1

-

-

-

11-1/2

 

292

29

 

737

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7-1/4

 

184

34

 

864

-

2

-

-

-

-

13-1/4

 

337

32-1/8

 

816

7-3/4

 

197

36-1/8

 

918

-

-

-

1

-

-

14-1/2

 

368

34-1/8

 

867

8-3/4

 

222

39-3/4

 

1010

1

-

-

1

-

-

16-1/4

 

413

37-3/8

 

949

10-3/8

 

264

45-5/8

 

1159

-

-

2

-

-

-

19-1/4

 

489

42-1/2

 

1080

10-5/8

 

270

46-3/4

 

1187

-

-

-

-

1

-

20-1/2

 

521

44-5/8

 

1133

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

11-7/8

 

302

51-3/8

 

1305

1

-

-

-

1

-

22-1/4

 

565

47-3/4

 

1213

13-1/2

 

243

57-1/4

 

1454

-

-

-

2

-

-

25-1/4

 

641

52-7/8

 

1343

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

13-3/4

 

349

58-3/8

 

1483

-

-

-

-

-

1

26-1/2

 

673

55

 

1397

15

 

381

63

 

1600

1

-

-

-

-

1

28-1/4

 

718

58-1/8

 

1476

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16-1/2

 

419

68-3/4

 

1746

-

1

-

-

-

1

31-1/4

 

794

63-1/4

 

1607

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

18

 

457

74-5/8

 

1895

-

-

1

-

-

1

34-1/4

 

870

68-1/2

 

1740

19-5/8

 

498

80-3/8

 

2042

-

-

-

1

-

1

37-1/4

 

946

73-3/4

 

1873

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20-5/8

 

524

84-1/8

 

2137

1

-

-

1

-

1

39-1/8

 

994

76-7/8

 

1953

22-3/4

 

578

91-7/8

 

2334

-

-

-

-

1

1

43-1/4

 

1099

84-1/8

 

2137

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24

 

610

96-1/2

 

2451

1

-

-

-

1

1

45-1/8

 

1146

87-1/4

 

2216

25-7/8

 

657

103-1/2

 

2629

-

-

-

-

-

2

49-1/4

 

1251

94-1/2

 

2400

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

26

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

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Contents Fire Risk Wood Burning FireplaceHot screen/mesh and glass doors will cause burns Number Listing Label Information/LocationGrate User Guide Table of ContentsInstaller Guide Warranty Hearth & Home Technologies Limited Warranty CONDITIONS, Exclusions & Limitation of LiabilityHeat & Glo HST-42D 27177 Rev AB 11/08 Non-Combustible Materials Listing and Code ApprovalsAppliance Certification Combustible MaterialsHot glass will cause burns Operating InstructionsYour Fireplace Grate Seasoned WoodStarting a Fire FirescreenVented Gas Log Sets & Gas Log Lighters Glass DoorsOutside Air optional Optional ComponentsWood Fuel Disposal of Ashes Maintainance and ServiceChimney Inspection/Cleaning Creosote Formation and Need for RemovalInspect Grate Glass CleaningCheck Firebox Refractory Frequency As desiredTroubleshooting Guide Start Fire Problems Possible Cause SolutionGetting Started Typical Fireplace SystemNegative Pressure Design and Installation ConsiderationsDraft Locating Fireplace & Chimney Frequently open doors Central heat outlets or returnsInspect Fireplace and Components Tools and Supplies NeededFireplace System Requirements Framing & Clearances Select Fireplace LocationClearances Clearances to Combustible MaterialsSidewalls/Surrounds Frame the FireplacePosition the Fireplace Installation of FireplaceThings to Consider Place Protective Metal Hearth StripsFt min. from top of uppermost chimney section to air inlet Install Outside Air Kit AK14/AK18 InstallationChimney Assembly Chimney Requirements MetersUsing Offsets/Returns ExampleInstall Chimney Air Kit Assemble Chimney SectionsInstall Ceiling Firestops Installing the Ceiling FirestopInstall Attic Insulation Shield Prepare Attic Insulation ShieldFollowing steps should be skipped if using a chase Complete InstallationInstall Flashing Cut out Hole in RoofChimney Termination Requirements Flat RoofsChase Installations Construct the ChaseInstall Fireplace & Chimney Install Chase TopInstall Termination Cap ST375 Square Termination CapTS345/TS345P Square Termination Cap Field Constructed Shrouds ShroudsRadiation Shield Open Top Shroud TR342 caps require radiation shieldMailbox Style Shroud radiation shield required Roofed Style Shroud radiation shield required= 1/k x inches of thickness FinishingHearth Extension Finishing Material Noncombustible FacingCombustible Mantel Clearances to Mantels or other Combustibles above FireplaceSquares Wood Burning Inserts AccessoriesGas Log/Lighter Provision Gas Code, Ansi Z223.1Fireplace Dimensions Reference MaterialsChimney Components Catalog #14-1/2 10-7/8 276 mm Service Parts HST-42DDo not Discard this Manual
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