Productivity ideas for a furnace?? Ok, sure what type or types of furnace applications are you refering to?
Note: production rate of a typical furnace is base solely on heat transfer! Maximization of heat tranfer will increase production of heat transfer thru any funace! However consideration on safety and the amount of heat "build-up" could suggest problems! on newer units like for example residental home central heating systems manufactureres have take the "vent pipe" and left more in the furnace decreasing the size of the pipe and adding a fan to suck out the exhaust and 10 % of the heat! of course there is more to the system then that tho!
Application is everything!
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Do reply I am in need of a laugh!