These under window ventilation are easy enough to make, print some adapter and add dryer ventilation hose. You can take it out easily if you want to undo the whole thing. And you don't have to run the fan very fast, as long as it keep slightly negative pressure in the enclosure is good enough, otherwise you will have trouble with layer split for ABS.
https://www.thingiverse.com/thing:763081
https://www.thingiverse.com/thing:2923474
For regions with extreme cold weather or strong wind, you will need to print the outside ventilation grille or shaft to prevent wind blow in and bring in cold wind/sand/neighbor's cooking smell or cigarettes.
If you use cheap filament, the total cost can be controlled under $20 and it is easy enough to make. (I hope this is not derail from the topic)
(Da Vinci 1.0, Jr. 1.0 RAMPS, miniMaker) X4, (Creality CR-10S, CR-10 mini, Ender-3) X4, Anycubic MEGA X4, Anycubic Chrion X1, ADMILAB Gantry X2 (MonoPrice Maker Select V2, Plus, Ultimate)X4--Select mini X1, Anycubic photon X4, Wanhao duplicate D7 X1.
iNSTONE Inventor Pro X2, CTC Dual X2, ANET-A8, Hictop 3DP-11, Solidoodle Press, FLSUN I3 2017X1