Layflat Ducting(13″ X 500′) Strong, 4-mil poly ducting for nearly any application. 500 feet per roll. 13″ wide, expands to 8.3″ diameter. Cut to length. Compatible with: Evolution DriTec Pro 150 DrizAir 2400 DrizAir LGR 2000 DrizAir 1200 DefendAir HEPA500