Computer fan air duct
thingiverse
Air duct to connect 120 mm x 32 mm cooling fan to 3/4 inch flexible wire loom. The fan and wire loom that I used. Wathai 120mm x 32mm Brushless Cooling Blower Fan 12V DC Dual Ball Centrifugal Fan High Airflow https://www.amazon.com/gp/product/B08P1S5DBN/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 3/4" Wire Loom Non-Slit Polyethylene Corrugated Flexible Innerduct Conduit https://www.amazon.com/gp/product/B01M9A35ZW/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 Two versions one with a side port to bypass some of the air (V2) and one without side port (V1). If the door (V3) for the vent port moves too easily bend it slightly so it is tighter in the slide tracks. I used it to supply air to an oil heater. The side vent duct is used to vary the air output. I could have done that with a rheostat.
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