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Three (3) Pack of A13D Solutions proprietary 120mm fan coupler is designed specifically for Antminer bitcoin miners but will work with any standard 120mm fan. Maintaining temperature and proper airflow are vital to every mining operation! To install, just replace the Antminer fan guard with our fan coupler using the existing OEM screws and attach 4" vent hose to immediately reduce heat and noise in the containment area. Our 120mm fan coupler was designed in collaboration with an HVAC Technician to fit standard 4 in vent hose maximize airflow away from your miner. A13D Solutions produces these 120mm fan adapters using PLA, a non-toxic bio-plastic. Product does not include 4 in vent hose or clamp and will not work with Antminer S7 single fan design. As with most 3D printed items, expect some surface inclusions and visual imperfections that are cosmetic ONLY and do not effect the functionality of this utility part. Any defects discovered that are associated with the 3D printing process will be replaced at no charge. This A13D Solutions product is 3D printed via the fused deposition modeling (FDM) method. This product is printed 100% solid and not printed hollow to cut material costs like some other vendors. Please be aware of other makers selling similar products made from toxic materials like ABS that can release toxic gases after prolonged exposure to heat according to the MSDS (Material Safety Data Sheet). ABS is a great material but not the best choice for HVAC applications involving air circulation. *Antminer is a registered trademark of Bitmain Technologies. A13D Solutions is not affiliated with Bitmain Technologies or any other related organization.