![David Elfstrom on Twitter: "Important! Get the most out of your #boxfanfilter with a shroud on the outlet. Improves inlet flow & reduces power and noise. I've found optimum size for two David Elfstrom on Twitter: "Important! Get the most out of your #boxfanfilter with a shroud on the outlet. Improves inlet flow & reduces power and noise. I've found optimum size for two](https://pbs.twimg.com/media/E8h0dpEUUAIOIWG.jpg)
David Elfstrom on Twitter: "Important! Get the most out of your #boxfanfilter with a shroud on the outlet. Improves inlet flow & reduces power and noise. I've found optimum size for two
![Amazon.com: Tinker3D Antminer S19 T19 S17 T17 Double Fan Shroud 6 Inch Outlet to 2X 4 Inch Round ASIC Miner Air Cooling Duct 2X 120mm USA Made (1) : Electronics Amazon.com: Tinker3D Antminer S19 T19 S17 T17 Double Fan Shroud 6 Inch Outlet to 2X 4 Inch Round ASIC Miner Air Cooling Duct 2X 120mm USA Made (1) : Electronics](https://m.media-amazon.com/images/I/71XSTqqC6QL.jpg)
Amazon.com: Tinker3D Antminer S19 T19 S17 T17 Double Fan Shroud 6 Inch Outlet to 2X 4 Inch Round ASIC Miner Air Cooling Duct 2X 120mm USA Made (1) : Electronics
![nVent HOFFMAN HH05GS35001 MCLA Filter Fan Shroud, 10.41 in L x 8.32 in W x 2.32 in THK, Mild Steel | SMC nVent HOFFMAN HH05GS35001 MCLA Filter Fan Shroud, 10.41 in L x 8.32 in W x 2.32 in THK, Mild Steel | SMC](https://www.smcelectric.com/ResourcePackages/Roc/assets/images/na-images/na-img.jpg)
nVent HOFFMAN HH05GS35001 MCLA Filter Fan Shroud, 10.41 in L x 8.32 in W x 2.32 in THK, Mild Steel | SMC
![Nvent Hoffman Filter Fan Shroud, Type 4/4X Replacement Gasket, 14.81x11.90x0.69, Rub HH10RGKSP | Zoro Nvent Hoffman Filter Fan Shroud, Type 4/4X Replacement Gasket, 14.81x11.90x0.69, Rub HH10RGKSP | Zoro](https://www.zoro.com/static/cms/product/full/Grainger_img362xx00a2b8.jpeg)