Prior to gas entering the proportioning valve of an air-oxygen blender, it is important that:

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It is important for the air and oxygen pressure to be equal before gas enters the proportioning valve of an air-oxygen blender to ensure accurate and consistent blending of the gases. This can be achieved by using pressure regulators or adjusting the flow rates of the gases. The use of a reducing valve is not necessary or recommended as it can affect the accuracy of the gas blend. Connecting both gas inlets to oxygen would result in a mixture that is too rich in oxygen and can be dangerous for the patient.

Prior to Gas Entering the Proportioning Valve of an Air-Oxygen