At 120 in. by 72 in. and 72 in. by 120 in. at 2,000 fpm, VFD-10D is the largest multiple-section vertical dynamic-rated curtain-style fire damper in the industry. It is available in three styles: with curtain-style blades, with out-of-the-air-stream and curtain-style blades, and with out-of-the-air-stream frame and curtain-style blades.