Unit: British thermal unit (th) per square foot hour

JSON
Identifier: UN999
Name: British thermal unit (th) per square foot hour
Symbol: Btu_{th}.(ft2.h)-1
Reference: https://www.nist.gov/pml/special-publication-811/nist-guide-si-appendix-b-conversion-factors/nist-guide-si-appendix-b8#B