B. Using Offsets/Returns

To bypass any overhead obstructions, the chimney may be offset using a 15-deg (SL315) or 30-deg (SL330) offset/re- turn.

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 offset/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 5.3. 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

 

15-degree

 

 

30-degree

 

 

 

 

 

 

 

A

 

B

 

A

 

B

 

 

 

 

 

 

 

in.

mm

in.

mm

in.

mm

in.

mm

SL306

SL312

SL318

SL324

SL336

SL348

1-5/8

41

13-3/8

340

3-5/8

92

15-1/2

394

-

-

-

-

-

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2-7/8

73

17-3/4

451

5-1/2

140

18-5/8

473

1

-

-

-

-

-

4-1/8

102

22-3/8

568

7-1/4

184

21-3/4

552

2

-

-

-

-

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4-1/2

114

23-5/8

600

8-1/2

216

23-3/4

603

-

1

-

-

-

-

5-3/4

146

28-1/4

718

10-1/4

260

27

686

1

1

-

-

-

-

6

152

29-3/8

746

11-1/2

292

29

737

-

-

1

-

-

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7-1/4

184

34

864

13-1/4

337

32-1/8

816

-

2

-

-

-

-

7-3/4

197

36-1/8

918

14-1/2

368

34-1/8

867

-

-

-

1

-

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8-3/4

222

39-3/4

1010

16-1/4

413

37-3/8

949

1

-

-

1

-

-

10-3/8

264

45-5/8

1159

19-1/4

489

42-1/2

1080

-

-

2

-

-

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10-5/8

270

46-3/4

1187

20-1/2

521

44-5/8

1133

-

-

-

-

1

-

11-7/8

302

51-3/8

1305

22-1/4

565

47-3/4

1213

1

-

-

-

1

-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

13-1/2

243

57-1/4

1454

25-1/4

641

52-7/8

1343

-

-

-

2

-

-

13-3/4

349

58-3/8

1483

26-1/2

673

55

1397

-

-

-

-

-

1

15

381

63

1600

28-1/4

718

58-1/8

1476

1

-

-

-

-

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16-1/2

419

68-3/4

1746

31-1/4

794

63-1/4

1607

-

1

-

-

-

1

18

457

74-5/8

1895

34-1/4

870

68-1/2

1740

-

-

1

-

-

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

19-5/8

498

80-3/8

2042

37-1/4

946

73-3/4

1873

-

-

-

1

-

1

20-5/8

524

84-1/8

2137

39-1/8

994

76-7/8

1953

1

-

-

1

-

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

22-3/4

578

91-7/8

2334

43-1/4

1099

84-1/8

2137

-

-

-

-

1

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24

610

96-1/2

2451

45-1/8

1146

87-1/4

2216

1

-

-

-

1

1

25-7/8

657

103-1/2

2629

49-1/4

1251

94-1/2

2400

-

-

-

-

-

2

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.

A

B

1-1/4 in. (32 mm)

OVERLAP

Figure 5.3 Chimney Offset/ Return

¨Example: Your “A” dimen- sion 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 14 1/2 in. (368 mm) using a 30° offset/return. It is then determined from the table that you would need 34 1/8 in. (867 mm) (Dimension “B”) between the offset and return. The chimney component that best fits your application is one SL324.

18

Heat & Glo • RHW-485 • 33221 Rev O • 08/06

Page 17 Page 19
Page 18
Image 18
Hearth and Home Technologies RHW-485H owner manual Using Offsets/Returns, Degree SL306 SL312 SL318 SL324 SL336 SL348
Page 17 Page 19

RHW-485, RHW-485H specifications

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