Beyond 20 PPM, it's difficult to make colorless CS with any LVDC system. It gets really 'iffy' in the 25 to 30 PPM range.
Perhaps HVAC can do it if it is properly set up.
ken
At 10:12 PM 7/30/01 -0500, you wrote:
>>>>
Why? How? Do you mean the body cannot use it?<<<<
3 to 5 ppm is best anything over 20 ppm is a total waste.
Ted
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