Antminer Fan Duct Shroud Connect 4 Inch Vent Hose This air vent shield is designed to mount directly to a 120mm cooling fan, attach your crypto mining rig to a 4-inch hard pipe or flexible vent duct, and square plane mounts to the fan using existing screws. Hot air can be exhausted or fresh air introduced to help keep miners dry and cool is the perfect item to keep cool and increase mining efficiency. Suitable for Antminer DR3 L3+ S9 S9i S9J S9 SE S11 T15 S15 Z11 S17+ S17 Pro S17e T19 S19 S19J Pro DR5 D7 Z9 and other miners. Made of high-temperature ABS plastic that can withstand temperatures up to 221 degrees Fahrenheit (105 degrees Celsius).