If Thingiverse ever gets their crap together, the rest will be uploaded. WHAT A JOKE! This is a vent damper for use with 4 inch pvc and/or cloudline series 4 inch fan system made by acinfinity found here: https://www.ebay.com/itm/CLOUDLINE-T4-Inline-Booster-Duct-Fan-4-Cooling-Ventilation-Exhaust-Grow-Tents/332188647155?epid=14031748160&hash=item4d57fc7ef3&_trkparms=ispr%3D1&enc=AQAEAAADMKvsXIZtBqdkfsZsMtzFbFsbX3WcW5fmB%2Fx7ZbaZTyexAsWAMQhDettmwARfvxn82bs2XLl0ljbplzUUIpMzkAowtDC01bpFud9mBcbzOxyB4YePSw%2BjHJc7DpJyJy5ZYGOrPoZyFOGg8aUb%2BLSaWdLgzQZ9SnwCNddocUlb3pi4GiLa4PaRH405sbudiatcZAVvqRf7Tjj10a6Me6xMaLUQ9qKfTXR9%2BN7HyWM%2FU2I2WbVQkk1RrxwJ1r7rBGhb7T8dmG%2FncTZJGrUix6w%2FkN3Ma%2Fbn2Y4aFp4ddZCVKtDpQRfTp9uZrDukZfl95X3GXQIUWeBUUmNMj8c2lvBrJtRb4wnQejWPbRTeRJQmDc3ySxriufsN8jvPzQe0KDtvq3R7%2BhUd%2FYLCSEyj65XSRozbYaNk3ADOvYPfcC8d06jKS0hl3ViOOuUNtgGXLNmdmm5RgyBxgwvxgV2%2FLF10zsQF1IluG8SGe0S5OPBXbCkk2jIRrLERm4VShLGvitug5qoTey8HVak0FFmKSNFqPLGUy74KFP9Stoq2sD66T2cae2sBmr2SnammpejHXER%2BTxlvi5gE5M7l6aD46UrEW4B370MC4X3XPiItB75ufWxdfUrvZwBISwIqXQF0zuUq7RYOEAB71Tw2O5xgVKlhi0ecFK9FtBLbpGlKv9c3BFYg3Icp9gbw9SEyuAFeVLE7iRm01%2BrM%2Bh8OBPOxffLQ11YNxUeITk%2B3RMKJLNfqFxm2AdNBUtXeFyaRQxyXBKCma%2ByUwZsiNNBK8ja07C6kIxs%2B1IIEYPGrqrZfAZoR8SNGEwwwjQ5Fg6BHH%2FfKLDtmSsw2%2BtETWlBR7OETTSx7d9Cu%2FQXJssQdoEbQtIUQC4K4WaCXh4%2FaG9cUOB00Ft4F1SkoKwwiYgQEHg3EA0CcAziobjhJpNScqMjyZVrcq0EmbRXu6y14BtLtc2wsReYSVzI7USJV%2Fz7H9Opoku7GyzPvBYvXYMtEyTgqTXCsNOZY58Q2N0BS3sJxmRfAxqzQNDEgnOmWJrxd6CIOYmaCUUbMEi8qeFWE6xrIWmzWRqsjeqfjWwEssYj3wv1E9%2FI%2B7Q%3D%3D&checksum=332188647155817e3b86311e4d85b263cbc68a1a9bda This unit is powered by any USB port on PC or any USB charger adapter for a cell phone for example. This unit is designed to close vent piping when not in use to prevent draft. The pressure switch will sense when fan starts/stops activating damper. The end-stop switches cut power to the motor and energizes the corresponding LED status light. The unit is sized to match Cloudline fan connector size, but an adapter for 4 inch PVC is included. This is sized for 4 inch SEWER piping NOT schedule 40 DVW piping. I used standard micro end-stop switches found here: https://www.ebay.com/itm/SS-5GL-Micro-Limit-Switch-For-3D-Printer-Accessories-ENDSTOP-RAMPS-1-4-Omron/113812349783?hash=item1a7fbea357:g:4CEAAOSwmUhdJJq9 I used a 12vdc 3rpm motor found here: https://www.ebay.com/itm/DC-12V-High-Torque-Low-Noise-Micro-Electric-Geared-Box-Reduction-Motor-3-RPM/233038065388?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20160811114145%26meid%3Dcfe2b78fd28548fcba0b2f2d1697ff11%26pid%3D100667%26rk%3D4%26rkt%3D8%26mehot%3Dpp%26sd%3D274109631806%26itm%3D233038065388%26pmt%3D1%26noa%3D1%26pg%3D2334524&_trksid=p2334524.c100667.m2042 I used a universal adjustable pressure switch found here: https://www.ebay.com/itm/CLEVELAND-CONTROLS-Air-Sensing-Switch-Adjustable-NS2-0000-05/312715063306?epid=1826583055&hash=item48cf45300a:g:ECAAAOSwzixdPOHl I used a 5vdc relay found here: https://www.ebay.com/itm/Omron-G6S-2-Y-5VDC-Signal-Relay-G6S-Series-Non-Latching-DPDT-2pcs-1-lot/122995227295?hash=item1ca3163a9f:g:hzMAAOSw6RVct29v I have included a basic wiring schematic to assist in wiring. I used all 3mm bolts and washers: 4 - M3x14mm 2 - M3x6mm 2 - M3x35mm 2 - M3x20mm 3 - M3x10mm 1 - M3 washer (could used more if desired) Here is video link: https://youtu.be/AwAUBlHWGcc Enjoy!