Lucent Technologies TM-4500 installation instructions Hearth Extensions and Wall Shields

Page 16

16

12"

Finished

(305mm)

Max.

Wall

 

1 ¹⁄₂" (38mm)

Combustible

Noncombustible

Mantel

and Trim

Wall Covering

12"

Spacer

(305mm)

 

Min.

 

6⁹⁄₁₆"

(167mm)

Fireplace

Opening

Typical Installation

Figure 46

Note: Only non-combustible wall finishing materials are allowed on the front top of the unit, from the top edge of spacers down. See Figures 45 and 46.

Hearth Extensions and Wall Shields

A hearth extension must be installed with all fireplaces. It is to protect the combustible floor in front of the fireplace from both radiant heat and sparks. The hearth exten- sion must extend beyond the front at least 20" (508 mm) and both sides at least 12" (305 mm) (Figure 47 ). Use a hearth extension constructed of a durable noncom- bustible material having an equal or better (lower k value) insulating value of k = .84 BTU IN/FT2 HR ° F or a thermal resistance that equals or exceeds r = 1.19 HR ° F FT2/ BTU IN. With these values, determine the minimum thickness/material required using the formula and Page 17.

Note: Any noncombustible material whose k value is less than .84 or whose r value is more than 1.19 is acceptable.

If the fireplace is installed on a combustible floor, use the metal safety strips (provided) on the floor extending half under the fire- place and half under the hearth extension.

A wall shield is required where a continuous perpendicular side wall is within 18" of the fireplace opening (Figure 48 ). Use a 40" W x 40" H wall shield constructed of a durable, noncombustible material having an equal or better (lower k value) insulating value than k =

.84 BTU IN/FT2 HR ° F. At no time may a perpendicular side wall be located closer than 12" from the fireplace opening.

If fireplace is installed diagonally across a 90° corner; no wall shields are required.

Hearth Extension Dimensions

 

 

 

A

20" (508 mm)

 

 

 

B

36" (914 mm)

 

 

 

C

12" (305 mm)

 

 

 

D

60" (1524 mm)

C

B

C

 

 

 

 

 

 

A

 

 

 

D

 

Figure 47

 

 

 

 

Methods of Determining Hearth Extension and Wall Shield

Equivalents - To determine the thickness required for the alternate material when either the “k” value or “r” value is known, use either the k formula or r formula.

Example: If Micore 160 is to be used for the hearth extension fireplace, how thick must this material be?

kM = k value per inch of alternate material rM = r value per inch of alternate material

TM = minimum thickness required for alternate material TS = standard thickness of the alternate material

kL = k value per inch of listed material rL = r value per inch of listed material

TL = minimum thickness of listed material

Note: An asterix “*” indicates, it is a value taken from Table 1.

Using the k formula:

Minimum

 

k-value (per Inch) of

 

Specified min.

thickness of

=

alternate material (kM) x

thickness

alternate

 

k-value (per inch)

 

of listed

material (TM)

 

of listed material (kM)

 

material (TL)

TM (inches)

=

kM

 

x

TL

 

 

*.84

 

 

 

TM (inches)

=

*.35

 

x

1"

 

 

*.84

 

 

 

.416 (inches) =

.416

 

x

1"

Answer - The minimum required thickness of the Micore 160 is .417”, therefore round up to nearest standard thickness available which is 1/2”.

Using the r formula:

Minimum

 

r-value (per Inch)

 

Specified min.

thickness of

=

of listed material

x

thickness

alternate

 

r-value (per inch)

 

of listed

material

 

of alternate material

 

material

TM (inches)

=

rL

x

TL

 

 

rM

 

 

 

TM (inches)

=

*1.19

 

x

1"

 

*2.86

 

 

 

 

 

 

 

 

.416 (inches) =

.416

 

x

1"

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

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Contents Wood Burning Fireplaces 850,045M REV. N/C 01/2007 Retain These Instructions For Future ReferenceWH Report No. J20054576-231 Table of Contents Typical Installation PrecautionsIntroduction Chimney Clearances and Mantel Height RequirementsAssembly Outline Chimney HeightChase Enclosure Location of FireplaceAssembly Steps Installing the FireplacePRE-INSTALLATION Notes Fireplace ClearancesFireplace Specifications Front ViewLeft Side Top ViewFraming Dimensions 48 ¹¹⁄₁₆ 1237 mm Framing Dimensions for Ceiling Flue TypeFTF10 FTF10 OffsetInstalling the Chimney System For Canadian Installations Proceed with StepsNo x ¹⁄₂ screws provided Figure For Canada Only Roof Pitch Model Flat to 6/1212 to 12/12 FTF10-S4 StabilizerUsing the FTF10-CTDTM Round Termination Using a CT2 Chase TerminationTEN-FOOT Rule Summary 508mmSpecial Offset Instructions Multiple TerminationsFTF10 Chimney Component Calculations Offset Calculations 20 Max 6mStabilizer 10 Max Underside of ChimneyFTF10 Vertical Elevation Chart FTF10 Offset Elevation ChartOr Ceiling Installing OffsetsOptional Equipment Considerations Cold Climate Insulation GAS Line ConnectionFireplace Finishes Hearth Extensions and Wall Shields RM = rM x TS = 0.05 x 3/4 = Value = 1/k = r x thickness of material usedRM = rM x TS = 0.20 x 1/2 = Installation Components Finish to Your TasteLennox Hearth Products West Taft Avenue Orange, California63L16 FTF10-12 63L17 FTF10-18 63L18 FTF10-36 62L94 850,045M REV. N/C 01/2007 Orange, CA

TM-4500 specifications

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