CMH is a unit of flow rate (m3/hr or cubic metres per hour)
A BTU is a British Thermal Unit, a unit of energy that is equal to around 1055 joules.
You cant convert the two as they are a measure of different things, but changing BTU (or Btu) to joules will help standardise the calculations.
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It is not clear what units you are referring to. The question software doesn't support many special characters, such as the slash (/), so you will need to edit your question and spell things out. Is the second one BTU per hour (BTU/hr)? For the life of me, I can't figure out what CMH is.cmh is cubic meter per hour - m3/hr
To convert CFH to BTU, you need to use the formula 1 CFH which is equivalent to 1000 BTUs.
1 BTU(ISO) = 1,054.5 Joules 1 Joule = 0.00094832 BTU(ISO) (rounded)
How to convert Cubic meter to BTU
Not possible. Square feet is area measuring unit. BTU is energy measurement unit.