Can a refrigerated dryer dry my medical air below 32 F?
Yes if the dryer is functioning properly and has close to the dryers designed flow passing through it. NFPA-99 2005 dictates that the dew point level shall be measured after the final line regulator…at 50-55 psi. At this reduced pressure level, a refrigerated dryer can dry the air to a dew point level well below 32 F. This is due to the fact that as the air is reduced in pressure (from 100 psi to 50 psi) the air expands. As the air expands, the dew point level will always drop. It’s important to ensure that the dryer has close to its designed air flow feeding into it. This holds especially true with non-cycling dryers. (i.e a 50 CFM dryer is designed to have 50 CFM of air flowing through it).
