Lennox Hearth LSO-43 installation instructions Installing the Chimney System, Feet

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Step 4. The fireplace should be secured to the side framing members through the nailing flange (Figure 16 ).

Framing

Stud

Nailing

Flange8d Nail Or

Equivalent

Figure 16

Note: The nailing flange and the area directly behind the nailing flange is exempt from the clearances described on the fireplace clear- ance label.

Step 5. Connect the 6" (152 mm) Class 0 air duct provided, to the collar on the fireplace with the clamps provided in the kit’s hardware package (Figure 17 ).

Air Duct

Air Inlet

Clamps

Note: Air Inlet

Must Be Free Of

Any Obstructions

Figure 17

Step 6. Route the Class 0 air duct out the back or side to an outside wall. The duct inlet should be located above any anticipated snow level. Check local building codes for any restrictions. We recommend that the inlet be at least 4 feet above grade level.

Note: Secure the duct hood to a vertical post with the inlet positioned downward. Ensure that nothing blocks the hood opening. This duct must never terminate higher than 3 feet below the fireplace termination (Figure 18 ).

3 Feet

Figure 18

Step 7. Cut or frame a hole through the outside of the enclosure for the installation of the duct inlet hood. A 6 ¹⁄₂" (165 mm) diam- eter hole is required. Feed the loose end of the flexible duct through the hole cut for the inlet hood and attach to the collar on the inlet hood using one of two clalmps provided with the kit. Insert the hood into the opening. Secure in place with nails driven through the holes in hood flange. Seal with noncombustible wa- terproof silicon type caulking. If additional duct is needed, use Class 0 metallic air duct (refer to Figure 17 ).

INSTALLING THE CHIMNEY SYSTEM

Step 1. Using standard construction framing techniques, construct openings for the chim- ney through the ceiling(s) and roof or through an outside chase. All framing must maintain the minimum air space clearance at all times.

CAUTION: ALLOW A MINIMUM 2" (51 MM)

CHIMNEY AIR SPACE TO COMBUSTIBLE FRAM- ING MEMBERS THROUGHOUT VERTICAL AND/ OR OFFSET CHIMNEY INSTALLATIONS.

A minimum 2" (51 mm) air space must be reserved for all combustible and noncombus- tible materials extending for any continuous length surrounding the chimney.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

Reference Figures 14 and 15 and charts “Fram- ing Dimensions for Ceiling and Roof,” which specify minimum ceiling and roof dimensions.

For new construction, to determine chimney cen- ter line, use plumb line from ceiling or roof above fireplace to the center of fireplace flue collar.

For remodeling, plumb to the center of the fireplace flue collar from the ceiling or roof above. Drive a nail through the ceiling or roof from below to mark position. Mark and cut a hole in the ceiling (around the nail) (Figure 19 ). Then plumb from ceiling or roof directly above the cut hole to determine roof hole position.

Figure 19

Step 2. Position the appropriate firestop spacer at the ceiling and fasten temporarily with two (2) 8d nails or equivalent. Use a flat firestop spacer, Model F10FS-2, for the FTF10 system if chimney penetrates vertically. If the chimney penetrates through the ceiling at a 30° angle (offset chimney) then use a 30° firestop spacer, Model F10FS30-2. Use one nail on opposite sides of the firestop to hold in position. Fasten permanently, using at least two (2) more 8d nails or equivalent, after the chimney sections have been assembled through the firestop spacer and after necessary adjustments have been made. The firestop spacer must be se- cured in place by at least four (4) 8d nails or equivalent when completely installed.

Note: If patio installation requires that a chim- ney passes through a roof or room above, be sure to comply with all local building codes.

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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 Typical Free Standing Installation IntroductionGeneral Information Clearances and Height RequirementsAssembly Outline Assembly StepsPRE-INSTALLATION Notes Chimney SystemInstalling the Fireplace Waterproofing the FireplaceAir Inlet ClearancesFireplace Specifications Front ViewSide View Left Top ViewFraming Specifications FTF10Installing the Chimney System FeetSpace 10 3m Max Firestop Space Above Or CeilingChimney 30 Offset Through Floor Using a FTF10-CT1 Chase Termination Using a FTF10-CT2 Chase TerminationUsing a FTF10-CTDT Chase Termination Roof Pitch Model Flat to 6/12FTF10 Chimney Component Calculations Multiple TerminationsTEN Foot Rule Summary Special Offset Instructions Offset CalculationsFTF10 Vertical Elevation Chart HeightChimney Only Chimney OnlyFTF10 Offset Elevation Chart Installing OffsetsFirst, review the Offset Elevation Chart and for reference Underside Of ChimneyOptional Equipment Considerations Fireplace FinishesHearth Extensions and Wall Shields Value = 1/k = r x thickness of material used RM = rM x TS = 0.05 x 3/4 =RM = rM x TS = 0.20 x 1/2 = ShieldInstallation Components Finish to Your TasteModel Catalog Number LSO-43Round Termination 63L43 Firestop Spacer Flat 63L36Combination Offset/Return Elbow 63L34 Offset/ Return Package 63L23850,015M REV. C 03/2007 Orange, CA

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.