The Original Can-Fan� S-Series are centrifugal fans utilizing our proven German design, Swiss components and precision manufacturing. They have carried AMCA certified numbers longer than most other fans have been around and you can be sure you�re getting every CFM we claim to deliver. The Can-Fan� can be easily installed in minutes using the included mounting bracket. They have a powder-coat finish. These fans are designed for demanding continuous operation with carbon air filters and long duct runs. 100% speed controllable.