3 ms·
No, older furnaces draw their combustion air from inside the building, the direct vent draws combustion air from outside. Modern furnaces release a lot less he
by maxerickson 5y ago
No, older furnaces draw their combustion air from inside the building, the direct vent draws combustion air from outside.
Modern furnaces release a lot less heat as waste, one result of that is that there aren't a lot of hot gases to deal with, a flue isn't necessary.