If you visit a store there is usually a chart showing the various air tools and how much delivery they require to work correctly. If you are only going to power brad, staple or nail guns, any small compressor will do the job. Most other tools require a higher volumn of air for operation. Impact guns and air sanders use the most and require the compressor to be larger. I own an older Craftsman model with a 5 HP motor and a 25 gallon tank. This powers my tools pretty well. I still run out of air if I am doing a good deal of sanding with a DA.(Dual Action sander) Your best bet is to get the largest tank you have room for. There is no substitute for capacity.
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Mike
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