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Because of the new standards, the leading manufacturers of high pressure guns had to find a solution to increase the efficiency of their products where the transfer capacity was notoriously poor. As a consequence, they conceived guns that could convert the high pressure air supplied by compressors into low pressure air.
These guns called HVLP (high volume low pressure) could fulfil all legal provisions with the sole restriction of using a min. 10 hp compressor because air consumption was higher than 20 cubic feet per minute (cfm).