Suitable for rotary dryer, bathroom or kitchen ventilation fan, hydroponic cultivation, ventilation fan duct connection Pre-drilled mounting holes for easy and secure mounting Made of ABS plastic, it is compact and Do not damage the connection of the ventilation pipe, prevent air leakage, and connect to the ventilation system safely Use duct connectors designed for durability and efficiency to ensure the duct connection of the ventilation system, Manufacturer: Rxgiasup