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- CFM cubic feet per minute
- PPD pounds per day (1 ppd = 18.9 g/hr = 0.45 kg/day = 0.0189 kg/hr)
- PPM parts per million
- PSIG pounds per square inch gauge
- SLPM standard liters per minute
- VAC Volts AC (alternating current)
- W Watts
- %w-w ozone concentration; percentage ozone by weight