Hearth and Home Technologies 36, 42 owner manual Finishing, Hearth Extension

Page 23

8Finishing

A. Hearth Extension

 

 

WARNING

A hearth extension must be installed with all fireplaces to

protect the combustible floor in front of the fireplace from

Fire Risk

both radiant heat and sparks. See Figures 8.1­‑8.3.

• Metal hearth strips MUST be installed.

 

 

 

 

 

Continuous,

 

 

Sparks or embers may ignite flooring.

1/2 in. Micore

non-combustible sealant

Fireplace

 

 

non-combustible material

Protective

 

insulation

 

Hearth Ext

Tile, stone or other

 

 

 

or equivalent

 

 

 

 

 

 

 

(see Table 11.2)

 

 

Metal Hearth

 

 

 

 

Strip

 

2 in. (51 mm)

Floor constructed of wood or required other combustible material

Figure 8.1 Hearth Extension Construction 1 in. (25 mm)

overlap

The hearth extension should slope away from the front of the

 

 

 

fireplace and chase at 1/8 in. to 1/4 in. per foot. Spark strips

 

 

 

 

 

 

must be used on top of any combustible hearth materials

 

 

 

Protective metal strips are placed 2 in. (51 mm) under the

used for moisture management.

front of the fireplace and must extend beyond the front

This fireplace has been tested and approved for use with a

and sides of fireplace opening by 2 in. (51 mm).

 

 

 

hearth extension insulated to a minimum R value of 1.03.

Figure 8.2 Positioning the Protective Metal Hearth Strips

To substitute materials for the factory-available hearth ex-

 

 

 

 

 

 

 

tensions, see Figure 8.3 and calculate insulation alterna-

WARNING

 

tives as per Table 8.1 and the following formulas:

 

• Thermal conductivity per inch thickness = k

Fire Risk

• k = (BTU)(inch) / (foot2)(hour)(°F)

• Hearth extensions must be installed

• Required thickness = Rk

exactly as specified.

• Thermal resistance per inch thickness = r

High temperatures or hot embers may ignite

concealed combustibles.

• r = (foot2)(hour)(°F) / (BTU)(inch)

• Required thickness = R / rB.

Table 8.1

 

 

 

 

 

 

 

 

Hearth Extension Insulation Alternatives-Total minimum R Value must equal 1.03

 

 

 

 

 

 

 

 

Minimum

 

 

 

 

 

 

k per inch

r per inch

thickness

 

 

 

 

 

Material

thick

thick

required

 

 

 

 

 

Hearth & Home HX3, HX4 (Micore 300™)

0.49

2.06

1/2 in.

 

 

A

 

B

USG Micore 160™

0.39

2.54

1/2 in.

 

 

C

USG Durock™ Cement Board

1.92

0.52

2 in.

 

 

 

 

 

Cement Mortor

5.0

0.20

5-1/8 in.

 

 

 

 

 

Common Brick

5.0

0.20

5-1/8 in.

CAT. #

 

A

B

C

Ceramic Tile

12.50

0.08

12-1/4 in.

 

HX3

in

52

16

8

Armstrong™ Privacy Guard Plus

0.46

2.18

1/2 in.

Marble

14.3-20.0

0.07-0.05

14-5/8 in. - 20-3/8 in.

 

mm

1321

406

203

 

 

 

 

HX4

in

66

20

12

 

 

 

 

 

mm

1676

508

305

 

 

 

 

Figure 8.3 Hearth Extension Dimensions

 

Outdoor Lifestyles by Hearth & Home Technologies Inc. • Montana US-CAN4039-156 Rev K • 7/11

23

Image 23
Contents Fire Risk Hot glass will cause burnsModel Listing Label Information/LocationSerial Number Grate Table of Contents Not intended for use as a primary heat source Listing and Code ApprovalsAppliance Certification Typical Fireplace System Design and Installation ConsiderationsGetting Started Moisture ResistanceFire Risk Explosion Risk Tools and Supplies NeededInspect Fireplace and Components Exterior Walls see Figure Freestanding Installations see FigureFraming and Clearances Selecting Fireplace LocationEnclosed Fireplace Clearances to Combustible Materials ClearancesFrame the Fireplace Sidewalls/SurroundsChimney Requirements Sharp Edges Asphyxiation Risk Installation of FireplaceInstall the Dual Cooling Air Kit Position the Fireplace Secure the FireplaceHeight of Chimney Components Chimney AssemblyChimney Offset/Return Using Offsets/ReturnsAssemble the Chimney Sections Install the Ceiling Firestops in./19 mm in length Install the Attic Insulation ShieldDouble-check the Chimney Assembly Secure the ChimneyChimney Termination Complete the EnclosureMark the Exit Point of the Roof Chase TopST1175/ST475 Square Termination Cap Install the Termination CapTCT1175 Terra Cotta Cap Gas Code, Ansi Z223.1 AccessoriesGas Log/Lighter Provisions Hearth Extension FinishingGlass Doors Finishing MaterialMantel General Information Operating InstructionsFirescreen Outside AirClear Space Near the Fireplace Flue DamperWood Fuel GrateStarting a Fire Diagnostics and Problem Solving TroubleshootingFirebox Refractory Maintenance and Servicing the FireplaceChimney Inspection/Cleaning Disposal of AshesChimney Fire Maintenance Task ListWhen cleaning glass door CleanReference Materials Fireplace DimensionsDescription Fireplace ComponentsCatalog # Chimney ComponentsAssembled Diameter 17 in./432 mm Height 24 in./610 mm 15-3/4 400 mm 635 x 635 mm 584 x 584 mm 737 x 737 mm Woodburning Termination CapMONTANA-36, MONTANA-36H D. Service PartsMONTANA-42, MONTANA-42H Service PartsThis page intentionally left blank This page intentionally left blank Warranty Coverage This warranty is void if Limited WarrantyRO N a CO ISD D