Airgas, Inc., Radnor, PA, U.S. distributor of industrial, medical, and specialty gases, welding, safety, and related products, reported sales increased 18% in its first quarter ended June 30, 2007. Sales were $915 million. Profit was up 34%.   ; Acquisitions accounted for 11% of the first-quarter sales growth. Same-store sales increased 7%, with hardgoods up 6% and rent up 8%.   ; We had an outstanding quarter. We continue to see good growth in non-residential construction and energy markets, and our strategic products are also performing well," said Airgas CEO Peter McCausland.