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Posted By bobed2121,
Dec 8, 2009 at 5:24 PM
in my Gas fireplace?
To similate a glowing ember bed & to give the appearance of burned charcoal remnants.
Both are supposed to add a little realism to your gas burning unit,
by making it look more like a wood burner. Purely aesthetic.
Lava rock is only to go around the insert never on the flames. But the glowing ember can go on the low flame to look like a coal bed.