Computer fans should last well.
I checked my hw-storage and found couple interesting radial blowers from old Nvidia Gtx 260 graphic cards.
Good old days when computers run hot and cooled with a leaf blower. 😂
I think i will try to make my version too. I have couple surplus filters from old Racal respirator that i once had.
I could use same 10.8V batteries that i use with a cordless drill..