Of course you’re not, but you might like squirrel-cage fans like we do. If so, this take-out, cream-colored ABS plastic squirrel-cage blade is for you. Originally from portable AC units, they measure 6-3/4" dia x 3-3/8" across with a flattened 5/16" ID bore and a 3/4" shaft that extends 7/8” into the cage. Could be re-rigged for a gerbil wheel. Made in USA.

Nice little 24VDC, 3-blade muffin fan from Nidec™ draws 70mA and pushes 31cfm. Measures 3-1/8" square with 4mm mounting holes on the corners, and a pair of 13” leads. Manufactured right here in the US of A.

This vacuum pump from Koge Electronics draws 100-250mA at 4.8V and is rated for >2.6L/minimum output and -460mbar of pressure. Measures 2-9/16" x 1-3/16" x 1-5/16" with a 3/16" OD x 3/8" inlet barb and a 3/16" OD x 1/2" tall outlet barb, plus (4) 1/8” ID mounting wings. Power terminals are exposed and you may get short leads. Koge model #KPV276.