A few months back I had the chance to check out the 120mm Silverstone Air Penetrator fan. The Air Pentrator gave a new spin to the traditional fan design by incorporating a grill on the exhaust side that's designed to better channel the air. Today I have both the AP141 140mm Air Penetrator here on the test test bed, along with Silverstone's FF141B 140mm fan filter that also recently hit the markets.