AntMiner S1 S3 S5 S7 S9 L3+ Custom 120mm Fan Duct Cooling Shroud to Vent - ORIGINAL (5 inch)

Awesome product! Best shroud available. I started with a 4 inch shroud that caused my Antminer temps to go up about 8-10 degrees. Then I switched to this 6 inch shroud and 6 inch ducting; and problem solved. My advice, stick with 6 inch shroud and ducting for efficient air flow. Many of the 4 inch shrouds actually block the fan.

The inner hole is not 6 inches.