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You need to know the area of the room - "40 foot" is a distance. I'll assume you're saying this room is 40 x 40 feet.

1 foot = .3048 meters. So the room is 12.19 x 12.19 meters, or 149 cubic meters. Divide by 14, you get 10.6 x 1 kW, or 10.6kW.

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