Product Overview
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Zone / ROOM:
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Air Handler BTU:
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Coverage Area:
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Condenser BTU:
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Outdoor Operating Temp (Cool/ heat):
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Warranty
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The herringbone panel liner enhances the firebox’s aesthetic appeal with a classic brick pattern, improves heat reflection into the room, and adds a durable, easy-to-clean surface.
The Heatmaster 42" Vent-Free Big Mouth Firebox is approximately 42 inches wide and requires proper clearances to combustible materials, gas line access knockouts, and installation following manufacturer guidelines and local codes.
When installing a vent-free firebox, maintain the manufacturer-specified clearances to combustibles—typically several inches on all sides—and ensure the room has adequate ventilation per local codes and the installation manual to prevent buildup of combustion gases.