The Lambro indoor clothes dryer exhaust vent kit featuring 4 inch x 5 foot UL 2158A clothes dryer transition duct is ideal for venting indoors for ELECTRIC clothes dryers only. This kit allows to vent indoors when outdoor venting is not possible. Add water to the bucket, this traps the lint exhausted from the dryer during the drying cycle. It is recommended to clean out the bucket after each use. Included is a wall bracket to attach the bucket to the wall.