18E6 | Forced Air Propane Heaters Mr. Heater Contractor Series Forced Air Propane Heaters range from 38K to 400K BTU’s and are built to last with high quality components. Typical uses include: construction sites, patios, factories, sporting events, utility and out buildings, and farming functions, (barns etc. ). How Much Heat Do you Need? You can calculate the amount of BTUs required by using the following method: Measure the space’s dimension to determine cubic feet. ( Length x Width x Height = Cubic Feet) Subtract the outside temp from the desired inside temp to determine the temperature increase. If you have measured temperature in Fahrenheit, calculate the required BTUs with this formula: (Cubic Feet x Temperature Increase x . 133 = Required BTUs) If you have measured temperature in Celsius, calculate the required BTUs with this formula: (Cubic Feet x Temperature Increase x . 2394 = Required BTUs) Mr Heater F270035-MH35FA Features: Heats approximately 800 sq. ft.Runs up to 12 ... ... .
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