Best Air Hose for Nail Gun - Overview | Warevise- what size air compressor for nail gun ,The air compressor is the most common source of power for nailers, and you need an air hose to connect your air compressor to nailer. Read our guide about the best air hose for nail guns. Fully researched and based on real user reviews.What size compressor is needed for a nail gun?A pneumatic nail gun is an intermittent power tool that does not require continuous supply of air. You need short bust of air to drive nails into the wood. So, all you need is a portable air compressor with at least 2 CFM rating and 2 to 6 gallon tank capacity.