garage furnace wiring

I picked up a used house furnace to use in my garage. The previous owner had been using it in his garage, it just sat on the floor and pulled air in the side at out the top. I will probably mount it to the ceiling. I'm trying to find out what size wire I need to run to it.
It has four heating elements. One is broken and disconnected, and I'm going to disconnect one more. I will be left with two 4.8kw elements. There are two 60A breakers built into the furnace. I will only be using one breaker, the other one will be turned off and disconnected. The way I measure it, at 240v it will be drawing 40 amps, plus some for the blower. The wire run from the garage subpanel to the furnace will be about 20 feet. What size wire and breaker will I need in the subpanel for it?
Thanks for any help. -Ryan
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Figuring at 220v I come up with 43.6 amps--the fan shouldnt draw very much power but will bring you even closer to 50 amps.
I would probly just go with a 60 amp DP breaker in the panel and for a fairly short run use #4 copper wire.
--

SVL



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I would have thought that #6 wire would be adequate, but I am certainly no expert.
Dave

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Very well could be more than adequate, I never consulted the charts, I dont know what type cable the OP plans on using, his length of run, etc........I simply stated what I would probly do.
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