The fundamental difference lies in the pressure. HBOT (Hyperbaric Oxygen therapy) technically refers to everything above 1 ATA (Atmosphere), but UHMS (Undersea & Hyperbaric Medical Society) states that for clinical hyperbaric therapy, the pressure needs to exceed 1,4 ATA whilst breathing near 100% Oxygen.
mHBOT (medium hyperbaric Oxygen therapy) ranges between 1 ATA and 1,45 ATA whilst breathing Oxygen enriched air.
The Biobarica (RevitalAir) 430 chamber operates at 1,45 ATA and yields approximately 90% Oxygen enriched air at a flow rate of 10 liters per minute.
Hyperbaric therapy conducted at 1,45 ATA dramatically reduces claustrophobia and barotrauma events that frequently occur at higher pressures, but whilst still maintaining a critical level of hyperoxia.
Regarding safety, high-pressure environments carry a higher risk, while the use of mild pressure chambers significantly reduce the occurrence of adverse events, being considered 100% safe.