$BTU_{IT}$, \italic{Foot per Square Foot Hour Degree Fahrenheit} is an Imperial unit for 'Thermal Conductivity' expressed as $Btu_{it} \cdot ft/(hr \cdot ft^2 \cdot degF)$.
British thermal unit (international table) foot per hour Square foot degree Fahrenheit is the unit of the thermal conductivity according to the Imperial system of units.
$BTU_{IT}$, \italic{Foot per Square Foot Hour Degree Fahrenheit} is an Imperial unit for 'Thermal Conductivity' expressed as $Btu_{it} \cdot ft/(hr \cdot ft^2 \cdot degF)$.