Lennox Hearth LSO-43 Value = 1/k = r x thickness of material used, RM = rM x TS = 0.05 x 3/4 =

Lennox Hearth LSO-43 installation instructions Retain These Instructions For Future Reference, OTL Report No -F-01-2
Lennox Hearth LSO-43 installation instructions Table of Contents
Lennox Hearth LSO-43 installation instructions Typical Free Standing Installation, Introduction, General Information
Lennox Hearth LSO-43 Chimney System, Assembly Outline, Location of Fireplace, Assembly Steps, PRE-INSTALLATION Notes
Lennox Hearth LSO-43 Waterproofing the Fireplace, Installing the Fireplace, Air Inlet, Clearances, Drain as follows
Lennox Hearth LSO-43 installation instructions Fireplace Specifications, Front View, Side View Left, Top View, ¹⁄₂ 38mm
Lennox Hearth LSO-43 installation instructions Framing Specifications, FTF10
Lennox Hearth LSO-43 installation instructions Installing the Chimney System, Feet
Lennox Hearth LSO-43 Or Ceiling, Chimney 30 Offset Through Floor, Space 10 3m Max Firestop Space Above
Lennox Hearth LSO-43 Roof Pitch Model Flat to 6/12, 12 to 12/12, Using a FTF10-CT1 Chase Termination
Lennox Hearth LSO-43 Multiple Terminations, TEN Foot Rule Summary, FTF10 Chimney Component Calculations
Lennox Hearth LSO-43 installation instructions Special Offset Instructions, Offset Calculations
Lennox Hearth LSO-43 installation instructions FTF10 Vertical Elevation Chart, Height, Chimney Only, Feet/Inches
Lennox Hearth LSO-43 installation instructions FTF10 Offset Elevation Chart, Installing Offsets, Underside Of Chimney
Lennox Hearth LSO-43 installation instructions Optional Equipment Considerations, Fireplace Finishes
Lennox Hearth LSO-43 installation instructions Hearth Extensions and Wall Shields
Lennox Hearth LSO-43 Value = 1/k = r x thickness of material used, RM = rM x TS = 0.05 x 3/4 =, Shield, 305mm under
Lennox Hearth installation instructions Finish to Your Taste, Installation Components, Model Catalog Number, LSO-43-H
Lennox Hearth LSO-43 Round Termination 63L43, Firestop Spacer Flat 63L36, Combination Offset/Return Elbow 63L34, 63L16
Lennox Hearth LSO-43 installation instructions 850,015M REV. C 03/2007, Orange, CA
Page 17

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

Listed Material

 

k (per inch)

r (per inch)

Listed Min.Thickness

 

 

 

 

Listed Material

.84

1.19

1"

 

KL

rL

TL

** Approved Alternate Materials for Floor/Hearth Protection

AlternativeMaterials

Thermal Values

MinimumThickness

 

 

 

(rounded to nearest 1/8 inch)

 

 

 

 

 

k (per inch)

r (per inch)

Min. Thickness

 

KM

rM

TM

Wall

Side Wall cannot

be Closer than 12"

Shield

(305mm) under

 

 

any Circumstances

C

B

Kaowool M Board

.47

2.13

.56" (1/2")

Micore 160™

.35

2.86

.42" (3/8")

U.S. Gypsum

 

 

 

Micore 300™

.46

2.17

.55" (1/2")

U.S. Gypsum

 

 

 

D

Figure 42

C A

Durock™ Cement Board

1.92

.52

2.29" (2-1/4")

U.S. Gypsum

 

 

 

 

 

 

 

Hardibacker™

1.95

.513

2.32" (2-3/8")

 

 

 

 

Hardibacker 500™

2.30

.435

2.74" (2-3/4")

Cultered Stone Hearth-

2.82

.355

3.36" (3-3/8")

stone™

 

 

 

 

 

 

 

Wonderboard

3.23

.31

3.85" (3-7/8")

 

 

 

 

Super Firetemp M

.61

1.64

.73" (3/4")

Johns-Manville

 

 

 

Super Firetemp L

.54

1.85

.64" (5/8")

Johns-Manville

 

 

 

 

 

 

 

Face brick

9.00

.111

10.71" (10-3/4")

Common brick

5.00

.20

5.95" (6")

Cement mortar

5.00

.20

5.95" (6")

 

 

 

 

Ceramic tile

12.5

.08

14.88" (14-7/8")

 

 

 

 

Marble

11

.09

13.10" (13-1/8")

 

 

 

 

Table 1

 

 

 

**If the hearth extension material(s) that is intended to be used is NOT listed on Table 1, the material can still be used if the material(s) is noncombustible. However, the manufacturer of the material must provide either the listed k- value per inch or r-value per inch with listed thickness so that the minimum thickness required for the hearth can be calculated (per instructions on this Page and/or as specified in the NFI Certification manuals).

Note: Also see NFI (National Fireplace Institute) Certification Manuals showing other acceptable calculation methods and acceptable alternate materials which can be used.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

Calculating Minimum Thickness if Multiple Materials are Used

At times it is important to know what combination of materials are acceptable for use as floor protection. The “R values” are used to determine acceptable combinations of materials because “R values” are additive where r and k values are not.

“R value” = 1/k = “r” x thickness of material used

Example: Given that the required “R value” for a suitable floor protector used must be equal to or greater than:

“R” = rL x TL = 1.19 x 1” = 1.19.”

If it is desired to elevate a marble hearth ex- tension to a level of 5” or more above the floor surface. What combination of noncombus- tible materials can be used to accomplish this?

If common brick is used so that the 3 1/2” dimension is the height, “R” for the common brick becomes:

brick

“R”M = rM x TS = 0.20 x 3 1/2" = .70

Using 1/2” of mortar to set the brick, “R” for the mortar is calculated as follows:

mortar

“R”M = rM x TS = 0.20 x 1/2" = .10

Next, a 3/4" marble slab set in 1/2" mortar cov- ers the brick, “R” for the marble and mortar becomes:

marble

“R”M = rM x TS = 0.05 x 3/4" = .038

mortar

“R”M = rM x TS = 0.20 x 1/2" = .10

17

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Contents Wood Burning Outdoor Fireplace P/N 850,015M REV. C 03/2007 Retain These Instructions For Future ReferenceOTL Report No -F-01-2 Table of Contents Introduction Typical Free Standing InstallationGeneral Information Clearances and Height RequirementsAssembly Steps Assembly OutlinePRE-INSTALLATION Notes Chimney SystemWaterproofing the Fireplace Installing the FireplaceAir Inlet ClearancesFront View Fireplace SpecificationsSide View Left Top ViewFTF10 Framing SpecificationsFeet Installing the Chimney SystemSpace 10 3m Max Firestop Space Above Or CeilingChimney 30 Offset Through Floor Using a FTF10-CT2 Chase Termination Using a FTF10-CT1 Chase TerminationUsing a FTF10-CTDT Chase Termination Roof Pitch Model Flat to 6/12FTF10 Chimney Component Calculations Multiple TerminationsTEN Foot Rule Summary Offset Calculations Special Offset InstructionsHeight FTF10 Vertical Elevation ChartChimney Only Chimney OnlyInstalling Offsets FTF10 Offset Elevation ChartFirst, review the Offset Elevation Chart and for reference Underside Of ChimneyFireplace Finishes Optional Equipment ConsiderationsHearth 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 = ShieldFinish to Your Taste Installation ComponentsModel Catalog Number LSO-43Firestop Spacer Flat 63L36 Round Termination 63L43Combination Offset/Return Elbow 63L34 Offset/ Return Package 63L23Orange, CA 850,015M REV. C 03/2007

LSO-43 specifications

The Lennox Hearth LSO-43 is a state-of-the-art gas fireplace that combines aesthetics with functionality, making it a popular choice for modern homeowners. This fireplace stands out due to its sleek design, efficient heating capabilities, and advanced technologies, ensuring that it not only enhances the ambiance of any living space but also provides warmth and comfort.

One of the main features of the LSO-43 is its contemporary design. With a wide viewing area and clean lines, it serves as a stunning focal point in any room. The fireplace is available in various finishes, allowing homeowners to choose a style that complements their decor. The large glass front provides an unobstructed view of the flames, creating an inviting atmosphere, whether used for cozy gatherings or quiet evenings at home.

In terms of technology, the LSO-43 employs a powerful heating system that ensures optimal warmth. It utilizes a high-efficiency burner that enhances the flame’s realism while maximizing heat output. This eco-friendly setup operates with minimal emissions, meeting stringent environmental standards. The unit also has a variable speed blower that effectively distributes heat throughout the room, ensuring consistent comfort.

Another notable characteristic of the Lennox Hearth LSO-43 is its ease of use. It comes with an intuitive remote control that allows homeowners to adjust flame height and heat settings at the touch of a button. Additionally, the fireplace can be operated with a wall switch, offering flexibility and convenience. This user-friendly design makes it accessible for everyone, from tech-savvy individuals to those who appreciate straightforward functionality.

Installation of the LSO-43 is relatively simple, as it can be vented through the wall or the roof, depending on the home’s layout. Moreover, it is compatible with various venting systems, which allows for flexible placement in both new constructions and existing homes.

Overall, the Lennox Hearth LSO-43 blends modern aesthetics with advanced heating technology. With its efficient energy use, stylish design, and user-friendly features, it presents an excellent option for anyone looking to enhance their living space with a gas fireplace. Whether for enjoying evenings with family or for entertaining guests, the LSO-43 promises warmth and elegance in any environment.
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