How Closed Combustion Fireplaces Boost Heating Efficiency

https://winterrooms.alderbrief.com/posts/how-closed-combustion-fireplaces-boost-heating-efficiency

Closed combustion fireplaces seal off the fire from the room's air, drawing oxygen from outside instead. This prevents heat from escaping up the chimney and stops cold drafts from entering. The fire burns more efficiently and safely, with most warmth staying in the room rather than being lost through open vents.