Wanhao i3 Fan Duct

thingiverse

Here's one that works perfectly for a 40mm 12v fan. First you need to purchase a ducting fan made from durable plastic which has two opposite ends, each one equipped with screws, allowing it to easily fit onto the fan and exhaust vents. This can usually be mounted with minimal setup effort. Once attached to both surfaces they become sealed making it possible for hot air circulation without escaping into your space where fresh cool air would be trapped in return keeping room temperatures down consistently across all time zones during long use cycles, saving consumers considerable costs through minimized cooling bill expense reductions over several years from this purchase made initially at relatively inexpensive pricing options available on multiple online store websites.