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Heatilator • FL92 Installation Manual • 4012-081 • Rev C • 10/03/13

B. 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. Secure offsets with screws ( not to exceed 1/2” / 13 mm in length) Secure returns with strapping. 

Straight chimney sections may be secured with screws. Keep chimney sections from separating or twisting.

•  Measure the shift needed to avoid the overhead obstruction. Refer to dimension A in Figure 4.2.

•  Find the appropriate A dimension listed in Table 4.3. The B dimension coinciding with the A dimension measurement in 

Table 4.3 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 4.2  Chimney Offset/Return

Table 4.3 Offset Dimensions

Example:

 

Your “A” dimension from Figure 4.2 is 14-1/2 in. (368 

mm). Using Table 4.3 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. 
You determined from the table that you would need 36-

5/8 in. (930 mm) (Dimension “B”) between the offset and 

return. 
The chimney component that best fits your application is 

two SL1112s.

A

B

SL1106 SL1112 SL1118 SL1136 SL1148

in.

mm

in.

mm

4 7/8

124

17 7/8

454

-

-

-

-

-

7 1/4

184

22 

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.

Summary of Contents for FL92

Page 1: ...ch glass Keep children away CAREFULLY SUPERVISE children in same room as fireplace Alert children and adults to hazards of high temperatures High temperatures may ignite clothing or other flammable ma...

Page 2: ...ireplace 12 F Protective Metal Hearth Strips 13 G Install Outside Air Kit 14 AK14 AK18 Installation 14 4 Chimney and Termination Requirements A Chimney Requirements 15 B Offsets Returns 16 C Terminati...

Page 3: ...s with diagrams Chimney installed locked and secured in place with proper clearance Chimney air kit installed Firestops installed Hearth Home Technologies recommends the following Comments communicate...

Page 4: ...ted as passing ASTM E 136 Standard Test Method for Behavior of Metals in a Vertical Tube Furnace at 750 C C Combustible Materials Materials made of or surfaced with any of the following materials Wood...

Page 5: ...cap Chimney penetrates roof preferably without affecting roof rafters Offset Return with hanger straps Framing headed off in ceiling joists Enclosed space above and around fireplace Mantel and surrou...

Page 6: ...uilding codes prior to installation Installation MUST comply with local regional state and national codes and regulations Consult insurance carrier local building inspector fire officials or authoriti...

Page 7: ...k Location NOT recommended Not the highest point of the roof Wind loading possible Multi level Roofs Windward Leeward Recommended Location Above peak Recommended Insulated exterior chase in cooler cli...

Page 8: ...fireplace and components from packaging and inspect for damage Vent system components and doors are shipped in separate packages Report to your dealer any parts damaged in shipment Read all the instr...

Page 9: ...n 76 mm 7 in 178 mm 5 3 8 in 137 mm Gas Knockout Outside Air Cover Plate Electrical Knockout 12 in 305 mm 44 in 1118 mm 47 1 8 in 1197 mm 8 1 4 in 206 mm 42 1 2 in 1080 mm 36 in 914 mm 40 in 1016 mm 2...

Page 10: ...fire Figure 3 2 Clearances to Combustible Materials Minimum Clearances to Combustibles WITHIN ENCLOSURE AREA Fireplace to backwall 1 2 in 13 mm Top standoffs to header 0 in 0 mm Door opening to sidewa...

Page 11: ...bs False Ceiling False Ceiling Insulation Insulation Figure 3 3 Chase Assembly 1 2 1 Chimney offset through exterior wall and enclosed in chase 2 Chase constructed on roof Figure 3 4 Chase Constructio...

Page 12: ...across the top of the fireplace must be above the level of the top standoffs No recess above standoffs Caution Risk of Cuts Abrasions Wear protective gloves and safety glasses during installation She...

Page 13: ...e of fireplace Overlap strips in the middle of fireplace opening by 1 in 25 mm minimum Metal strips must extend beyond the front and sides of the fireplace opening by at least 2 in 51 mm Figure 3 6 Pr...

Page 14: ...prevent air infiltration Caution Risk of Fire or Asphyxiation Do not draw outside combustion air from wall floor or ceiling cavity or enclosed spaces such as an attic or garage Do not place outside a...

Page 15: ...ngth between the offset and return 6 ft 1 83 m Maximum unsupported chimney height above the fireplace 35 ft 10 67 m Maximum unsupported chimney above roof 6 ft 1 83 m Warning Risk of Fire You must mai...

Page 16: ...m OVERLAP Figure 4 2 Chimney Offset Return Table 4 3 Offset Dimensions Example Your A dimension from Figure 4 2 is 14 1 2 in 368 mm Using Table 4 3 the dimension closest to but not less than 14 1 2 in...

Page 17: ...lustration above B Gas Termination Cap A Perpendicular Wall If using decorative cap cover s this distance may need to be increased Refer to the installation instructions supplied with the decorative c...

Page 18: ...chimney sections together firmly to resist movement Ceiling firestops are required where chimney passes through ceiling or floor Support straps for offsets not shown must be secured to adequate frami...

Page 19: ...to chimney sections Insert the screws provided through the predrilled holes Do NOT penetrate inner flue Secure chimney returns with hanger straps provided fasten to studs or joists Vertical straight r...

Page 20: ...e same dimensional lumber for framing ceiling firestop and joists 2 in 51mm clearance 2 in 51mm clearance Warning Risk of Fire Do NOT seal area between firestop opening and chimney pipe except where t...

Page 21: ...ulation Shield F Install Attic Insulation Shield Warning Risk of Fire You MUST install an attic insu lation shield when there is any possibility of insulation or other combustible material coming into...

Page 22: ...26 ga min Galvanized Chase Top Figure 5 9 Chase Top Construction H Install Chase Chase Top You MUST use a chase top in a chase installation Chase tops are available from your Heatilator dealer or may...

Page 23: ...pe and storm collar chase top Do NOT block air holes 3 clip brackets Slip over chase collar and attach with screws provided Termination cap pipe and chimney section must overlap 1 1 2 in 38 mm Assembl...

Page 24: ...m above top of chase and 7 in 178 mm below top of chase 2 in 51 mm 7 in 178 mm Figure 5 13 Installing a TCT1175 Terra Cotta Cap Storm Collar Chimney Pipe Chase Top Termination Cap not shown Chase 14 1...

Page 25: ...d shroud designs have been tested for HHT fireplace systems and termination caps 3 in 76 mm minimum Min Base Dim Min Base Dim Min Top Dim Min Top Dim Min Opening Width Min Opening Width Radiation Shie...

Page 26: ...nation Cap Chase Top Radiation Shield 3 in 76 mm Radiation Shield Height Termination Cap Figure 6 5 Roofed Style Shroud Dimensions 3 Roofed Style Shroud Radiation shield required 2 Mailbox Style Shrou...

Page 27: ...facing to prevent cold air leaks Large gaps can be bridged with fiberglass rope gasket Only non combustible materials may be used to cover the metal fireplace front Metal strips are placed 2 in 51 mm...

Page 28: ...uctivity of heat Refer to the formula in Table 7 1 to convert a k value to an R value Refer to Table 7 2 for hearth extension insulation alternatives Warning Risk of Fire Hearth extensions are to be i...

Page 29: ...on Raised to Bottom of Firebox Opening Non combustible flooring a minimum of 20 in 508 mm in front of and 12 in 305 mm to each side of the fuel opening is required The hearth framing must be construct...

Page 30: ...ng Material 20 in minimum Hearth Extension 1 2 in Micore or equivalent insulation Note The bottom of the grill is 5 3 4 in 146 mm above the bottom of the fireplace Finished hearth must NOT extend abov...

Page 31: ...urfaces of the fireplace where the non combustible board is placed over the metal surfaces the space between the metal face of the fireplace and framing members 7 ft 2134 mm minimum base of fireplace...

Page 32: ...tion A Gas Log Lighter Provision Warning Fire and or Asphyxiation Risk Use with solid wood fuel or decorative gas appliance only Gas fire generates fumes DO NOT install unvented gas logs Damper must b...

Page 33: ...eiling Firestop 30 deg AS10 Straight Attic Insulation Shield 24 in 610 mm JB577 Chimney Joint Band CB576 Chimney Bracket RF570 Roof Flashing Flat to 6 12 Pitch RF571 Roof Flashing 6 12 to 12 12 Pitch...

Page 34: ...3 in 330 mm JB577 Chimney Joint Band 2 in 51 mm 13 in 330 mm A B 17 in 432 mm RF570 Roof Flashing RF571 Roof Flashing 39 7 8 in 1013 mm 28 in 711 mm 15 1 4in 387 mm 25 1 4 in 641 mm 29 in 737 mm 15 1...

Page 35: ...8 in 822 mm 34 3 8 in 873 mm 23 in 584 mm 19 in 483 mm 15 5 8 in 397 mm 9 3 8 in 238 mm 10 1 4 in 260 mm 17 in 432 mm 20 in 508 mm 31 3 4 in 806 mm 34 5 8 in 879 mm TV11T Round Termination Cap B A C B...

Page 36: ...3 Hearth Extension B Optional Components A B C D LDS33 LDS46 Decorative Shroud E D A C B LDS BV Decorative Shroud Catalog A B C D in mm in mm in mm in mm LDS33 36 914 36 914 8 5 216 11 279 LDS46 48 12...

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