Whoops!! I hate to chime in off-topic but I consider this important.
Most likely MCF means Thousand Cubic Feet.
M is the Roman Numeral and is used with British Measures.
MM would be used for Million Cubic Feet.
K is the Greek letter for thousand and is used with metric measures.
M would be used for Million Cubic Meters.
Pat McNally
Seattle
47.7 122.3
>One of the pages on their site includes this statement: "Today,
>payloads weighing 5000 pounds are quite common and balloons of 20
>to 30 MCF are flown routinely." ("MCF" means million cubic feet, a
>unit for measuring the volume of the [inflated] balloon.) I don't
>have any idea how often "routinely" means.
>
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