Air compressors are sized by air pressure and air flow. In the US, pressure is measured in pounds per square inch (psi). Flow is measured in cubic feet of air per minute (cfm). Virtually all air compressors nominally operate at approximately 100 psi while air flow capacities vary from model to model, from a few cfm for small electric piston units to hundreds of cfm for gas or diesel driven portable screw compressors.
All AirSpade nozzles are designed to operate optimally at 90 psi and are manufactured in six different sizes (air flow rates) to match standard, commercially available compressors (see table below). Note that a smaller nozzle may always be used on a larger capacity compressor, but not the reverse. Running a nozzle with a higher flow rating than the capacity of the compressor will result in a significant pressure drop (less than 90 psi at the nozzle) and will noticeably diminish performance.
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