Hearth and Home Technologies A36RH, A42RH 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

Heatilator • A36R & A42R • 28376 • Rev AF • 11/08

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Contents
Hot screen/mesh and glass doors will cause burns Wood Burning FireplaceOperation Fire RiskNumber Listing Label Information/LocationGrate User Guide Table of ContentsInstaller Guide Warranty Hearth & Home Technologies Limited Warranty CONDITIONS, Exclusions & Limitation of LiabilityHeatilator A36R & A42R 28376 Rev AF 11/08 Non-Combustible Materials Listing and Code ApprovalsAppliance Certification Combustible MaterialsHot glass will cause burns Operating InstructionsYour Fireplace Grate Seasoned WoodStarting a Fire FirescreenOptional Components Glass DoorsVented Gas Log Sets & Gas Log Lighters Clear SpaceWood Fuel Hardwood vs SoftwoodDisposal of Ashes Maintainance and ServiceChimney Inspection/Cleaning Inspect 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 returnsTools and Supplies Needed Inspect Fireplace and ComponentsFraming & Clearances Fireplace Dimensions .A 1219 mm MinimumMm all configurations 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 Secure flex duct with metal tape, screws or wire ties Install Outside Air KitHood Wire Ties Flexible Duct not suppliedChimney Assembly Maintain minimum height of chimney above roofChimney Requirements Height of Chimney ComponentsUsing Offsets/Returns ExampleAssembling Chimney Sections Install Chimney Air KitInstalling Ceiling Firestops Installing Attic Insulation Shield Prepare Attic Insulation ShieldCut out Hole in Roof Complete InstallationInstall Flashing Chimney Termination Requirements Flat RoofsChase Installations Construct the ChaseInstall Fireplace & Chimney Install Chase TopInstall Termination Cap ST375 Square Termination CapTS345/TS345P Square Termination Cap TCT375 Terra Cotta CapRadiation Shield Some shrouds require a radiation shield. Use where specifiedShrouds Field Constructed ShroudsMailbox Style Shroud radiation shield required = 1/k x inches of thickness FinishingHearth Extension Finishing Material HX3 or HX4 Hearth Ext or equivilent insulationCombustible Mantel 305 mmGas Log/Lighter Provision AccessoriesInstall Fan Wood Burning Inserts165 mm 267 mm Dia 28376 Gas Knockout Rev Outside 23-3/8 Air 222 mm 22-3/4578 mm 10-1/2 235 mm 594 mm 244 mm 219 mm 206 mm 108 mm 13-1/2 343 mmFireplace Components Catalog # DescriptionChimney Components Catalog #305 mm 27-3/8 24-5/8 695 mm 625 mm Effective Outside Height Diameter 10-1/2 121 mm 267 mm10-1/2 267 mm 305 mm 24-5/8 625 mm 787 mm10-7/8 276 mm Service Parts A36R, A36RHA42R, A42RH Contact Information