Abstract: A gas delivery apparatus configured for use with a mechanical ventilator having an atmospheric inlet for drawing in atmospheric gas includes a connecting device configured to connect to an oxygen supply and an air supply and to deliver mixed air and oxygen gas to the atmospheric inlet of the mechanical ventilator. The connecting device further includes a user control for adjusting a fraction of oxygen in the mixed air and oxygen gas. The connecting device comprises a reservoir configured to hold a volume of the mixed air and oxygen gas.

Abstract: A surface-combustion radiant burner comprising a frame 1 of impermeable material supporting a porous element 2 permeable to gas and conduit means 7 to conduct a combustible gas mixture into a gas distributing space 5 enclosed by the frame 1 and the porous element 2, the porous element 2 being formed of metal particles of an alloy containing iron, chromium and aluminum and having the property of forming an alumina layer on heating in the presence of oxygen. And, a method of using such a burner for burning gas and air mixtures at high temperatures while minimizing nitrogen oxide production and burner corrosion.