Lennox Hearth LSO-43 Waterproofing The Fireplace, Installing The Fireplace, Air Inlet, Clearances

3.Note the floor construction, i.e. 2 x 6’s, 2 x 8’s or 2 x 10’s, single or double joists, type and thickness of floor boards.

4.Use this information and consult your local building code to determine if you need addi- tional support.

If you plan to raise the fireplace and hearth extension, build the platform assembly then position fireplace and hearth extension on top. Secure the platform to the floor to prevent possible shifting.

WATERPROOFING THE FIREPLACE

Although the LSO-43 fireplace is designed to drain to the front most of the water from rain and other sources that may enter the hearth area, condensation and unusual conditions may cause water to collect inside the fire- place bottom.

To prevent this, the builder must provide a means to drain water from under the fire- place by building or installing a water collec- tor of the builder's choice, or installing a PVC

Note: The LSO-43 has been provided with a drain plug under the fireplace by the air inlet opening. If the fireplace is on a platform or wooden surface, a hole must be bored to make room for an elbow connector. If the fireplace is on a concrete floor, it will be necessary to elevate the appliance at least 1" high to permit the installation of an elbow connector.

Step 1. Seal all joints, gaps and corners around the bottom of the fireplace before positioning the fireplace on its location (Figure 4 ).

Step 2. Locate the drainage plug and remove it by depressing the locking tabs and pushing down through the outside air opening at the bottom of the fireplace.

Step 3. On the exposed hole, install a PVC threaded coupling reducer, 3/4" x 1/2" going from inside of the fireplace out. Apply a silicone-based sealant around the base and threads before installation.

Step 4. Holding the reducer coupling with a wrench, thread a 3/4", 90 degree, PVC elbow to the reducer until it is tight to the metal.

Note: Clearance at the nailing flange for both fireplace models is 0" (0mm).

Note: Adjacent wall considerations are for an adjacent wall on only a single side. Walls should not be placed at minimum distance at both sides of the fireplace.

INSTALLING THE FIREPLACE

Step 1. Slide the fireplace into prepared fram- ing or position fireplace in its final position and frame later.

The fireplace may not be recessed into a com- bustible floor. Maintain the floor to hearth clearance established by the fireplace lower front face.

Step 2. Insert the provided metal safety strips, beneath the fireplace as illustrated (Figures 5, 6 and 7 ). The safety strips should overlap ¹⁄₂" min. for continual coverage of the floor.

drain as follows:

Seal All
Seams,	Access
Joints
And	Drain Plug
Corners	Through
Around The	Air Inlet
Bottom Of	Opening
Fireplace

Note: To assure proper drainage, the fireplace must be installed on a leveled surface.

Air Inlet

The installation of the air inlet is required for safe fireplace operation.

Step 1. Determine the location for air inlet, which can be installed through an outside wall. A 6 1/2" diameter hole will be required for installation of the air inlet assembly (see Figure 17 ).

Combustible Wall

Maintain

¹⁄₂" (13mm) Air Space at Sides and Back

¹⁄₂" (13mm)

Metal Safety Strip

Hearth Extension

Floor

Fireplace On Non-Combustible Floor

Drain Connector
(see Detail A )
Threaded	Threaded
Reducer
	Elbow ³⁄₄”
³⁄₄” x ¹⁄₂”
	@ 90°
(PVC)
	(PVC)

Detail A

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, PROVIDING THE AIR INLET IS TER- MINATED A MINIMUM OF THREE (3) FEET BELOW THE CHIMNEY CAP LEVEL.

Note: Air inlet ducts must not terminate in attic space.

CLEARANCES

Minimum clearance to combustibles for the fireplace is as follows; sides and back – ¹⁄₂" (13mm), combustible floor – 0" (0mm), adja- cent wall 18" (457mm), adjacent shielded wall

Figure 5

Combustible

Wall

Maintain

¹⁄₂" (13mm) Air Space at Sides and Back

¹⁄₂" (13mm)

Hearth Extension

Figure 4

(K factor of .84 or less 40" W x 40" H ) 12" (305mm), ceiling – 37 ¹⁄₂" (953mm). Refer to page 17 for more detail.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

Metal Safety Strip Platform Floor

Fireplace On Combustible Floor

Figure 6

5