Review on Rosewill 120mm Case Fan 4-Pack, Long Life Sleeve Bearing Computer Case Fan ROCF-13001, Ultra Quiet Cooling Fan 4 Pack 120 mm Standard Fan by Ricky Brooks

I use them in our fireplace heater-o-later. The 2 original fans were inefficient and noisy. There were five fan mounting holes but only 2 fans. Inexpensive production plant! A few years ago I ordered a 120mm fan kit for smoothness and efficiency. Eventually they wore out and failed. I ordered two sets of these and installed one set about a month ago. They are quieter than the first 120s. I use a 100mW 12V DC power supply to power them and it installs with a cover in the 5th hole. The whole setup is very efficient. We heat the family room and kitchen all winter - about 18 x 27 feet with this unit. Big little fans repurposed.