Monessen Hearth Direct Vent Gas Fireplace MDV500 - Manual (Page 35)

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Figure 45 - Rock Wool Placement on Rear of Burner.
1. Distribute one layer of rock wool to cover all round burner ports. Do not cover rectangular slots, located in front and
rear. See Figure 45.
LOGS AND ROCK WOOL INSTALLATION
WARNING
Do not use the entire bag of rock
wool to cover the burner. This could
cause the flame to burn poorly and
may lead to sooting.
2. Place the rear log by lining up the holes in the bottom of the rear log with the two pins located at the rear of the burner
on the bracket. See Figure 46.
Figure 46 - Installing Rear Log
Note: Placing rock wool on burner provides
glowing embers. For best results, pull the
rock wool apart into pieces the size of a
dime or smaller.