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( (1.006 kJ/(kg*K)) * (1.204 kg/m3) * (12 ft * 8 ft * 20 ft) * (26 degrees f) ) / (18000 btu/h)
( (1.006 kJ/(kg*K)) * (1.204 kg/m3) * (12 ft * 8 ft * 20 ft) * (26 degrees f) ) / (18000 btu/h)
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