Hearth and Home Technologies Montana-36 Chimney Requirements, Using Offsets and Returns

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MONTANA INSTALLATION INSTRUCTIONS

E. CHIMNEY REQUIREMENTS

When planning your fireplace location, the chimney construction and necessary clearances must be considered. The fireplace system and chimney components have been tested to provide flexibility in construction. The following figures are the minimum distances from the base of the fireplace. Minimum overall straight height is 6’ 4” if the fireplace is freestanding a minimum of 10’ from a combustible structure. See Figure 2, page 8.

1.

Minimum overall straight height

14 ft.

2.

Minimum height with offset/return

16 ft.

3.

Maximum height

90 ft.

4.

Maximum chimney length between an offset and return

20 ft.

5.

Maximum distance between chimney stabilizers

35 ft.

6.

Double offset/return minimum height

24 ft.

7.

Maximum unsupported chimney length between the offset and return

6 ft.

8.

Maximum straight unsupported chimney height above the fireplace

35 ft.

1.Using Offsets and Returns

a.To bypass any overhead obstructions, the chimney may be offset using a 30° offset/return (SL1130). Perform the following steps to determine the correct chimney component combination for your particular installation.

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

1)Measure how far the chimney needs to be shifted to enable it to avoid the overhead obstacle. See Figure 7, dimension “A” to determine chimney sections required to achieve the needed shift.

2)After determining the offset dimension, refer to Table 1 and find the “A” dimension closest to but not less than the distance of shift needed for your installation.

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

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

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

6)The effective height of the fireplace assembly is measured from the base of fireplace to top of starter collar. See Figure 6.

Offset/Returns

Table 1

 

 

 

 

 

 

 

 

 

 

A

B

SL1106

SL1112

SL1118

SL1136

SL1148

 

 

 

 

 

 

 

 

37/8"

14½"

-

-

 

-

-

-

6¼"

185/8"

1

-

 

-

-

-

9¼"

23¾"

-

1

 

-

-

-

 

 

 

 

 

 

 

 

12¼"

29"

-

-

 

1

-

-

 

 

 

 

 

 

 

 

145/8"

33"

-

2

 

-

-

-

175/8"

38¼"

-

1

 

1

-

-

21¼"

445/8"

-

-

 

-

1

-

235/8"

48¾"

1

-

 

-

1

-

27¼"

55¾"

-

-

 

-

-

1

 

 

 

 

 

 

 

 

295/8"

59"

1

-

 

-

-

1

325/8"

64¼"

-

1

 

-

-

1

355/8"

69½"

-

-

 

1

-

1

38"

735/8"

-

2

 

-

-

1

41"

78¾"

-

1

 

1

-

1

 

 

 

 

 

 

 

 

445/8"

85"

-

-

 

-

1

1

47"

891/8"

1

-

 

-

1

1

505/8"

95½"

-

-

 

-

-

2

Proper assembly of air cooled chimney parts results in an overlap at chimney joints of 1¼". Effective length is built into this table.

WARNING!

Do not com- bine offsets to create an off- set greater than 30° from vertical. This may create a fire hazard since the natu- ral draft may be restricted.

Figure 7 - Chimney Offset/Return

Example: Your “A” dimension from Figure 7 is 14½”. Using Table 1 the dimension closest to, but not less than 14½” is 145/8” using a 30° offset/return. It is then determined from the table that you would need 33” (Dimension “B”) between the offset and return. The chimney components that best fit your application are two SL1112s.

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4039-150 Rev B

01/04

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Contents Installation & Operating Instructions MONTANA-36 and MONTANA-42 Outdoor Woodburning FireplaceTable of Contents Heat-N-Glo fireplace system consists of the following Listings and Code ApprovalsDescription of the Fireplace System Optional Components IncludeFireplace System Components Fireplace ComponentsChimney Components Catalog # DescriptionFirestop Spacer TR11T PRE-INSTALLATION Preparation Fireplace Locations and Space RequirementsFrame the Fireplace Construct an Outdoor EnclosureSidewalls/Surrounds Using Offsets and Returns Chimney RequirementsChimney Height Requirements above roof line Number of Sections RequiredPlace the Protective Metal Hearth Strips Installation of the FireplacePosition the Fireplace Level the FireplaceInstall Firestop Spacers Assemble Chimney Sections∅ 6. Attic Insulation Shield Double-check the Chimney AssemblySecure the Chimney System Install the Termination Cap Installing a TR11T Round Telescoping Termination CapInstall the Cooling Air Kit furnished Install the Chimney Air KitComplete the Enclosure Gas Log/Lighter ProvisionsHearth Extension Factory Built Hearth ExtensionMantel Position the Hearth ExtensionFinishing Material Glass DoorsMontana Installation Instructions Operating Instructions General Information Flue DamperGrate FirescreenWood Fuel Starting a Fire Disposal of Ashes Maintenance InstructionsChimney Cleaning Creosote and SootHomeowner’s Notes Index Warranty For HEAT-N-GLO Fireplaces