I bought an old online UPS with the fan running all the time. In a room a few meters away, noise is a problem. In my old UPS that died I replaced the fan with 2x 12V Noctuas which provided similar airflow and were much quieter. The problem for me when using it in my new UPS was that the fan in it ran at 24 VDC. I found this adapter and hooked it up. I've been using it for a few weeks now and am enjoying the reduced noise levels. The adapter is inexpensive and I would recommend it to anyone who needs a small 24VDC load.
70mai Jump Starter Max Midrive PS06 black
37 Review
Efficient Charging With LST 7 Stages 5A Battery Charger - 3.3A 12V For Ultimate Performance
35 Review
Xiaomi 70mai Jump Starter Midrive PS01
120 Review
Keep Your Battery Fully Charged With A Smart 12V Charger/Maintainer Featuring Winter Mode
28 Review
Cordiant Winter Drive 2 255/55 R18 109T
33 Review
Reversible Mi 16-in-1 Ratchet Screwdriver
21 Review
Xiaomi Mijia Ratchet Screwdriver 16 in 1 Screwdriver with Interchangeable Bits, 10 pcs, Black
22 Review
Bit and socket set Stels Tool set, 1/2", 1/4", CrV, plastic case 94 pcs, Stels, 94 pcs, black
46 Review