Lennox Hearth LA41TCF, LA41CF Offset Elbow Assembly, Return Elbow Assembly, Combustion Air Kits

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Note: See Framing and Dimension Chart for the sizes of the ceiling and roof openings. The size of the roof opening varies with the degree of pitch of the roof.

Offset Elbow Assembly

Offset elbows install the same as chimney sections. First, snap the inner section INTO the preceding inner section of flue. Check connec- tion by pulling up slightly to ensure a tight fit. Next, the outer sections snap lock OVER the preceding outer section of chimney. Again, check outer section by pulling up slightly to ensure proper connection is made.

Return Elbow Assembly

Return elbows install the same way as round terminations and stabilizers:

Step 1. Hold return elbow over top of last chimney section.

Step 2. Center inner slip section into inner flue pipe-slip down.

Step 3. Center outer-locking section over outer chimney pipe. Push down until locking joint has firmly engaged.

Step 4. Pull up slightly on return elbow to ensure locking joint has firmly engaged.

Step 5. Secure support straps to framing members by nailing under tension in sheer (Figure 39 ).

Return

Elbow

Figure 39

Note: The return elbow assembly performs the same function as a stabilizer. Consider this when determining the need for a stabilizer.

Note: Do not apply excessive pressure to any subsequent chimney section following return elbow assembly when installing. Ensure that each subsequent chimney section is securely attached by testing as noted above.

Combustion Air Kits

The installation of an outside combustion air kit is highly recommended. It is very impor- tant to ensure good fireplace operation in homes which are tightly weather sealed or have ventilating appliances installed.

Step 1. Determine the source for outside air, which can be installed through an outside wall or into a ventilated crawl space. In either case, a 4 1/2" diameter hole will be required for installation of the air inlet assembly.

CAUTION: AVOID INSTALLING THE AIR IN- LET WHERE THE OPENING COULD BE BLOCKED BY SNOW, BUSHES OR OTHER OBSTACLES. THE MAXIMUM HEIGHT FOR THE OUTSIDE AIR IS 50 FEET ABOVE THE HEARTH, PROVING THE AIR INLET IS TERMI- NATED A MINIMUM OF THREE (3) FEET BE- LOW THE CHIMNEY CAP LEVEL.

Note: Combustion air inlet ducts must not terminate in attic space.

AIR INLET

EYEBROW

ASSEMBLY

FOAK

Figure 40

Step 2. Install the air inlet eyebrow (FOAK-4 or FOAK-4LD) through the wall opening (Fig- ure 40 ). Push a 4 inch diameter NON- COMBUSTIBLE Class 0 or Class I flexible duct onto the eyebrow.

Step 3. With the two remaining sheet metal screws and the two clamp brackets supplied, secure the duct to the air gate assembly as shown in Figure 41.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

Figure 41

OPTIONAL EQUIPMENT

CONSIDERATIONS

Gas Line Connection

Install a ¹⁄₂" gas supply line through fireplace wall for connection to a decorative gas appli- ance inside the firebox. Outside, the gas supply line connects to a gas shut-off valve recessed flush into the wall or floor. The valve should be controlled by a removable valve key for safety.

Always plumb gas line installation per local codes. Check all connections with soap suds; leaks will bubble. Never test any gas line con- nection with a match or open flame.

This provision is intended for connection to a decorative gas appliance incorporating an au- tomatic shut-off device and complying with the Standard for Decorative Gas Appliances for installation in vented fireplaces, ANSI Z21.60 (1991) or American Gas Association draft re- quirements for Gas-Fired Log Lighters for Wood Burning Fireplaces, Draft No. 4 dated August, 1993. Install in accordance with the National Fuel Gas Code, ANSI Z223.1. This complies with the revised U.L. 127 standard.

Vent Free Appliances

These units have been tested and approved to ANSI/IAS/AGA Z21.11.2 for use with unvented gas appliances and complies with the stan- dard for Factory-Built fireplaces, UL 127.

The unit has been tested for use with any unvented gas log sets having a maximum rating of 40,000 BTU. The minimum mantle configurations are outlined in Figure 42.