The Rumford fireplace on the right was a more efficient design for radiating heat than the conventional fireplace on the left.
Modern designs make fireplace heating a practical option.
PHOTO: SCOTT BARROW
A small, decorative unit.
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Profile view of air flow in the Franklin fireplace design.
The fireplace design Ben Franklin developed in the 1740s was intended to prevent smoke from filling a room.
A kacheloven's performance relies on both air channels and thermal mass