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DAVENEEL
05-06-2007, 03:39 AM
What I Need To Know Is Can R21 Refrigerant Be Used In A System Requiring R22?
theboss
12-07-2007, 01:33 AM
in short..NO
pendlesteve
13-07-2007, 02:32 PM
Just remember if it has an R number then all the digits that follow must be the same.