Lennox International Inc. MERIT PLUS MPB3530CNM-B User Manual
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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT PLUS
®
B-VENT GAS FIREPLACES (MPB33/35/40/45) • INSTALLATION INSTRUCTIONS
Glowing Embers
Bag of Glowing
Embers (rockwool)
Separate into Quarter
Size (separate) Pieces
Figure 24:
REFERENCE
Cat. No.
Model No.
Description
88L53
FGE
Bag of Glowing Embers
80L42
FDVS
Bag of Decorative
Volcanic Stone
Table 7: Firebox Accessories/Parts
Step 4. Placement of Logs—All top 
logs that rest on lower logs, do so over 
notches, indents or nubs. Proper log 
placement is critical to prevent sooting. 
Logs should be placed in the gaps between 
the flame peaks and should be positioned 
so they do not impinge the flames.
Step 5. Position the individual logs as 
shown in Figures 26, 27, and 28. Logs 
should be placed in the order shown. All 
logs that have notches to fi t over the grate 
tines should be positioned with these 
notches directly against the grate. Handle 
logs carefully to prevent breakage. 
Step 1. Remove the appliance front door 
(see Removing the Glass Enclosure Panel 
on Page 19).
Step 2. Install decorative volcanic 
stone—Sprinkle the decorative volcanic 
stone in a pleasing pattern. The volcanic 
stone should be placed directly on top of 
the firebox bottom, along the front and 
to the back at the right and left sides of 
the burner. Position any optional ceramic 
fiber liners before placing the stone. 
Logs should be positioned after the 
volcanic stone.
Note: This appliance is provided with 
enough glowing embers for several ap-
plications, do not feel compelled to use 
all that is in a new bag. For best glowing 
effect, replace the ember material annually. 
Replacement glowing embers are available 
(Catalog Number 88L53).
Step 3. Separate the glowing embers 
(rockwool) into pieces about the size 
of a quarter (see Figure 24). Keep the 
pieces fluffed up, not matted. Distribute 
these pieces over the front surface of 
the burner, as shown in Figure 25. Do 
not use more than is necessary. When 
properly positioned, the Glowing Embers 
will cover approximately 65% of the 
front burner and with no appreciable 
gaps or openings. Ensure that the main 
burner ports remain uncovered by the 
ember material.
Glowing Embers
Figure 25: Glowing Embers Placement
