Table of Contents

TABLE OF CONTENTS
Safety Rules	page	2
Tools and Building Supplies	page	2
Precautions	page	2
Introduction	page	3
Clearances/Height Requirements	page	3
Chimney System	page	4
Assembly Outline	page	4
Location of Fireplace	page	4
Assembly Steps	page	4
Preinstallation Notes	page	4
Waterproofing Fireplace	page	5
Outside Air Kit	page	5
Clearances	page	5
Installing the Fireplace	page	5
Fireplace Specifications	page	6
Framing Specifications	page	7
Installing the Chimney System	page	8
30° Offset through Floor/Ceiling	page	9
Ten Foot Rule Summary	page 11
Multiple Terminations	page 11
Chimney Component Calculations ...	page 11
Special Offset Instructions	page 12
Offset Calculations	page 12
Vertical Elevation Chart	page 13
Offset Elevation Chart	page 14
Installing Offsets	page 14
Optional Equipment Considerations . page 15
Gas Line Connection	page 15
Glass Doors	page 15
Fireplace Finishes	page 15
Mantels and Trim	page 16
Hearth Extensions/Wall Shields	page 16
Finish Requirements	page 18
Installation Components	page 18

IMPORTANT: PLEASE READ AND UNDERSTAND THESE RULES TO FOLLOW FOR SAFETY.

1.Before starting your fireplace installation, read these installation instructions carefully to be sure you understand them completely and in entirety. Failure to follow them could cause a fireplace malfunction resulting in serious injury and/or property damage.

WARNING: TO AVOID THE RISK OF DAMAGING FIREPLACE MATERIALS AND INCREASING THE RISK OF FIRE, DO NOT USE THE FIREPLACE TO COOK OR WARM FOOD.

2.Always check your local building codes. The installation must comply with all local, regional, state and national codes and regulations.

3.This fireplace must be installed with Security Chimneys FTF10 [10" (254mm) inside diam- eter] Chimney System only. This fireplace is intended for outdoor installation only. The chim- ney system must always vent to the outside of the building or structure.

4.To ensure a safe fireplace system and to prevent the build-up of soot and creosote, inspect and clean the fireplace and chimney prior to use and periodically during the heating season.

5.Use solid fuel only. DO NOT use artificial wax based logs, chemical chimney cleaners or flame colorants in your fireplace.

6.DO NOT use charcoal or coal under any circumstances.

7.NEVER use gasoline, gasoline-type lantern fuel, kerosene, charcoal lighter fluid, or similar liquids to start or “freshen up” a fire in this fireplace. Keep any flammable liquids at safe distance from the fireplace.

8.NEVER leave children unattended when there is a fire burning in the fireplace.

9.Before servicing, allow the fireplace to cool. Always shut off any gas to the fireplace while working on it. This will prevent the possibility of burns.

10.This fireplace is not a heater. It is designed to ensure homeowner comfort by providing supplemental heat to its immediate area.

11.Always ensure that the air inlet to the fire- place is free from debris and any other obstruc- tions that can block the entrance of air.

12.DO NOT use a fireplace insert or any other products not specified herein by the manufac- turer for use with this fireplace.

13."Smoke free” operation is not warranteed nor are we responsible for inadequate system draft, general construction conditions, inad- equate chimney heights, adverse wind condi- tions and/or unusual environmental factors or conditions beyond our control.

14.Never, under any circumstances, install a fireplace, chimney component or any acces- sories, that has visible or suspected physical damage as a result of handling or transporta- tion. These items should be inspected by your distributor or qualified factory representative to ensure safe condition. When in doubt, con- sult your distributor.

15.For additional safety considerations and complete operating instructions, refer to the Care and Operation Manual provided with the fireplace.

TOOLS AND BUILDING SUPPLIES NORMALLY REQUIRED

Tools should Include:

Phillips screwdriver

Hammer

Saw and/or sabersaw

Level

Measuring tape

Plumb line

Electric drill and bits

Pliers

Square

Building supplies: Framing materials Wall finishing materials

Caulking materials (noncombustible) Fireplace surround and hearth extension materials (noncombustible)

PRECAUTIONS

Note: These fireplace systems are not difficult to install. However, in the interest of safety, it is recommended that the installer be a quali- fied or certified “tradesman” familiar with com- monly accepted fireplace installation and safety techniques as well as prevailing local codes.

The most important areas of concern dealing with the installation of factory-built fireplaces are clearances to combustible materials, proper assembly of component parts, height of the chimney system, the proper use of accesso- ries supplied by the manufacturer and the techniques employed in using finishing mate- rials applied to the wall surrounding the fire- place, hearth extensions and wall shields.

Each of these topics will be covered in thor- ough detail throughout this manual. Please give each your special attention as you progress with your installation.

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.

LSO-43 specifications