Lennox Hearth CR-3835R Glass Doors, Cold Climate Insulation, Fireplace Finishes, Mantels and Trim

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Glass Doors

If glass doors are to be installed on these fireplaces, refer to specific installation instruc- tions packed with the glass doors. Use only the doors that are listed for use with these fire- places. Use of other non-listed glass door on these fireplaces may constitute a potential fire hazard and is not recommended.

CAUTION: CERTAIN GLASS DOORS OVERLAP THE BLACK METAL FACING OF THE FIRE- PLACE. IF THE FIREPLACE HAS BEEN FACED WITH NONCOMBUSTIBLE MATERIALS, THERE MIGHT NOT BE SUFFICIENT CLEARANCE TO INSTALL THE GLASS DOORS OF YOUR CHOICE. ENSURE ADEQUATE CLEARANCE IS MAINTAINED AT ALL TIMES SO AS NOT TO INTERFERE WITH THE INSTALLATION AND OPERATION OF GLASS DOORS.

COLD CLIMATE INSULATION

If you live in a cold climate, it is especially important to seal all cracks around the fire- place opening with noncombustible material and wherever cold air could enter the room. Surrounding materials must be caulked where it meets the black metal facing of the fireplace to avoid cold air intrusion. Use noncombus- tible caulking material only on fireplace facing to seal. Also, the outside air inlet duct should be wrapped with noncombustible insulation to minimize the formation of condensation. Do not place insulation materials on top of fire- place or against chimney sections.

Note: A 2" air space must be preserved for all combustible materials extending for any con- tinuous length adjacent to the chimney.

It is especially important to insulate between the studs of an outside chase cavity and under the floor if the floor is above ground level. Do not place insulation directly against the fire- place or chimney system.

FIREPLACE FINISHES

Mantels and Trim

It is sometimes best to frame your fireplace after it is positioned and the chimney is in- stalled. Frame enclosure for chimney and fire- place with 2 x 4’s (or heavier) lumber.

Note: The header may rest on the two (2) metal top spacers on top of the unit but the header must not be notched to fit around the spacers.

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 41 and 42 ).

These fireplaces may sit directly on a combus- tible surface. A 2" air space is required be- tween combustible framing and the chimney. A 1" air space is required between combustible framing and fireplace outer wrapper. In Canada, the minimum height for a combustible mantel is 18" (457 mm) above the fireplace opening. Figure 41 shows typical Canadian installa- tions. For installations other than Canada, combustible mantels and trim may be in- stalled 12" above the fireplace opening as per NFPA 211, Section 7-2.3.3. and Figure 42. If a mantel is of a noncombustible material, it is exempt from these requirements as long as it does not interfere with the installation or op- eration of glass doors.

Finished

Wall Header

8" Max. (203mm)

Combustible Mantel

Spacer

18" Min. (457mm)

Fireplace

Opening

Canadian Installation

Figure 41

Finished Wall

Header

 

12"

 

Max.

 

 

1 1/2"

Combustible

 

Mantel

 

and Trim

Spacer

12"*

 

Min.

 

8 3/8"*

 

Fireplace

Opening

*Both Of These Dimensions Must Be At Least 18” When An Unvented Gas Log Set Rated At 26,000 BTU Or Higher Is Used. (Maximum 40,000 BTU)

Typical Installation

Figure 42

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

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 extension must extend 8" beyond both sides of the fireplace opening and 16" beyond the front (see Figure 43 ). Use a hearth extension constructed of a durable noncombustible 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 us- ing the formula and Page 19.

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 (refer to Figures 6 & 7).

A wall shield is required where a continuous perpendicular side wall is within 12" of the fireplace opening (Figure 44 ). 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 8" from the fireplace opening. See Figure 46.

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

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Contents Retain These Instructions For Future Reference Wood Burning Fireplaces 850,048M REV. N/C 01/2007OTL Report No -F-20-4 Table of Contents General Information Typical InstallationIntroduction Chimney Clearances and Mantel Height RequirementsChase Enclosure Assembly OutlineChimney Height Before You StartInstalling the Fireplace Assembly StepsPRE-INSTALLATION Notes Fireplace ClearancesFireplace Specifications Consult all local codesFraming Specifications Installing the Chimney System 8d Nail Or EquivalentRoom Above Firestop Spacer Attic Above Or Ceiling 51mm** See **Note Min. Air Space to CombustiblesStabilizer Roof Pitch Using a CTD Round TerminationUsing a FTF8/10-CTDT Chase Termination Flat to 6/12FTF8 and FTF10 Chimney Component Calculations TEN Foot Rule SummaryMultiple Terminations Special Offset InstructionsOffset Calculations Return Elbow Max Stabilizer 10 Max OffsetInches FTF8 Vertical Elevation ChartNumber Of FTF8 Inches Feet/Inches MetersChimney Only FTF10 Vertical Elevation ChartNumber Of FTF10 Chimney OnlyFTF8 Offset Elevation Chart With FTF8-SS Starter Section FTF8-S4Inches Section FTF10 Offset Elevation ChartJoints FTF10-ES30 Number of FTF10Return Elbow Assembly Installing OffsetsOffset Elbow Assembly Combustion Air KitsFireplace Finishes Glass DoorsCold Climate Insulation Mantels and Trim12 305 mm Hearth Extension Dimensions 20 508 mm 38 965 mm203 mm Methods of Determining Hearth Extension and Wall ShieldRM = rM x TS = 0.05 x 3/4 = Finish to Your TasteValue = 1/k = r x thickness of material used ModelInstallation Components Cold Climate Kit 63L63 Chase Termination 63L51Square 63L52 63L29Page 850,048M REV. N/C 01/2007 Orange, CA

CR-3835R specifications

The Lennox Hearth CR-3835R is a contemporary gas fireplace that exemplifies modern design and advanced technology, creating an ideal centerpiece for any stylish living space. This model seamlessly combines aesthetic appeal with functional efficiency, making it a sought-after choice for homeowners looking to enhance their interiors.

One of the standout features of the CR-3835R is its impressive heat output. With a heating capacity of up to 35,000 BTUs, this fireplace effectively warms up areas ranging from 1,000 to 1,500 square feet, ensuring comfort during chilly months. The adjustable flame height allows users to customize the ambiance according to their preferences, providing a cozy atmosphere or a striking visual display.

The CR-3835R boasts an advanced design that incorporates a sealed firebox. This feature not only improves energy efficiency but also ensures that outdoor air doesn't compromise indoor air quality. The fireplace utilizes an electronic ignition system, which enhances convenience and reliability. With the ability to operate even during power failures, the CR-3835R is a dependable addition to any home.

Another notable characteristic of the Lennox Hearth CR-3835R is its use of high-quality materials. The fireplace is constructed with durable steel and features a refined glass front, allowing an unobstructed view of the flames. The elegant design is complemented by customizable finishing options, enabling users to select styles that align with their interior decor.

In terms of safety, the CR-3835R includes features such as a built-in safety shut-off valve, providing peace of mind for homeowners. The fireplace is also certified for use in a variety of settings, including conventional and direct vent applications. This versatility makes it suitable for a range of installation options.

Moreover, the Lennox Hearth CR-3835R is designed with user-friendly controls, including remote operation capabilities. This function allows for effortless adjustment of settings from the comfort of one's seat, adding an extra layer of convenience to the overall experience.

In summary, the Lennox Hearth CR-3835R combines stylish design, high efficiency, and advanced technology. Its impressive heat output, customizable features, and user-friendly operation make it an excellent choice for those seeking a modern gas fireplace that enhances both comfort and aesthetics in their home. With the CR-3835R, homeowners can enjoy the warmth and ambiance of a traditional fireplace, redefined for contemporary living.
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