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My fireplace has two blowers behind grates in the brick. Fans behind these lower grates mix air with heated air from behind the firebox and kick out a serious amount of heat into the room. The heated air is forced out of the upper grates on each side of the fireplace.

I have created a golf simulator in my garage and am looking at heating options. Is having a mason create another tunnel/branch terminating in the garage, though the cinder block possible? The garage is located immediately behind the fireplace.

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Depending on the skill of the mason, local building codes, the configuration of the fireplace ducts and the cost I'm sure a new duct is feasible.

What you may want to consider is it worth the price and disruption to the household. Also would it make more economical sense to have a separate heating unit for the garage?

A gas fired ceiling hung 50000 BTU furnace can be purchased new for under $500. It might be worth it depending on the cost for the mason th reroute the fireplace duct.

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    No gas in the house; electric only. I've just realized that the duct may be against fire code, being a hole connecting the interior to the garage. Plus it would turn into a heat loss. I just want to take the edge off. I may try an oil filter radiant heater. – Evil Elf Jan 3 '16 at 2:50
  • It was worth serious consideration anyway! Any furnace ducts that can be split-off? No violations in doing that. – ojait Jan 3 '16 at 4:08
  • With a heat pump, I think that would probably be a lost cost. Worse case scenario, I could use a ceiling mounted infrared heater just to heat each player between shots, but it would be nice if a radiant heater could bring the garage up to about 50/55 F. – Evil Elf Jan 3 '16 at 14:48
  • Maybe this: amazon.com/Optimus-H-9010-Garage-Ceiling-Utility/dp/B0041G69CM/… . or amazon.com/Vogelzang-BX22EL-Sweetie-Cast-Stove/dp/B002OMGYHA/… . Radiant kerosene heater keeps my shop warm, but needs an open air source, – ojait Jan 3 '16 at 16:42

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