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Originally Posted by rgodfrey The Scythe fan that 5cats recommends is a 120mm, 33.5 CFM, 8.7 dBA fan. The Silenx 120mm fans range from 46 CFM, 11 dBA to 90 CFM, 14 dBA. Do we know what CFM is required to keep the refrigerators cooling properly?
These fans come with a 3-wire connector, red, yellow, black. I’m assuming we only connect the red and black wires. What is the yellow wire for?
Somewhere I saw a chart that says what’s the lowest dBA number we can hear. Does anyone know what that is?
Randy |
Hi Randy, my thoughts go this way:
I don't think you need a hurricane force wind to achieve effective cooling here. To my mind the law of diminishing returns comes into play soon after inducing only a little air movement through the cooling fins.
I only installed one of two ordered fans because it was quick and easy to just use the existing mount/setup, at a cost of approximately $15. I figure that if I find the cooling insufficient, I'll add the second fan along with a DPDT switch so I can select one or both. Or possibly use the two-level thermostatic switch for automated single v. dual mode. Of course, I'll then have to fashion a new mounting setup...
In practice the single exhaust fan produces an easily discernible region of warmer air around the louvered vent. So it's certainly working, but I still need additional hot weather testing.
Three wires: the third is a sense wire, indicating rpm. In this context I can't use it: *snip*
My understanding regarding dBA:
This refers to decibels as related to the “A-weighted” scale. The A-weighted
scale parallels the sensitivity of the human ear and uses the lowest audible sound that the human ear can detect as the reference point for determining the decibel level of a noise. I.e., zero dBA is inaudible, while 8.9 dBA should be audible, to some at least.
Sure hope this babble makes sense to someone
Cheers,
-jd.