Astral and Stellar are able to entrain supplemental oxygen through the device via an oxygen port. These devices are designed to be compatible with supplemental oxygen up to a level of 30 L/min. Lumis devices are compatible with supplemental oxygen of up to 4 L/min in iVAPS mode, or up to 15 L/min in all other modes. At a fixed rate of supplemental oxygen flow, the inhaled oxygen concentration will vary depending on the ventilation mode and settings, patient breathing pattern, mask selection, and leak rate. FiO2 Astral: When an adult patient is using a non-vented circuit (double limb and single limb with valve, invasive and non invasive), almost 100% FiO2 can be achieved with an additional 30L/min of supplemental oxygen and more than 80% FiO2 can be achieved with an additional 15L/min of supplemental oxygen. Stellar: When adding 30L/min of supplemental oxygen, more than 90% FiO2 can be achieved if there is no leak, and almost 80% with a leak of 20L/min.