Can-Filter Flanges 4IN FLANGE / CAN The flange is used to connect the Can-Filter to the ducting or Can-Fan, this is for airflow out of the ventilated area. Flanges range in size from 4 - 12 inches depending on your specific needs.  | Manufacturer's Product Information |  | | 2007 MSRP Each $ | 6.69 | Case Weight | 0.32 LB | Case Dimensions | 5.5 x 5.5 x 2. IN | Case Quantity | 1 | | — Ships from SS: WA, CA, CO, MI, TN, PA, FL USA. |