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Old 08-13-2022, 02:33 PM   #1
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25RDS Range Fan - Upgrade Alternatives???

Hi All,

Looking to upgrade the exhaust fan in our 25RDS as the stock-unit is so noisy. Was looking to install a squirel-type fan but have read that those fall out of alingment easily and the cost is a bit high so I don't want to waste the money. Was looking at: https://a.co/d/eoJLMA8 which is no longer available as the company went out of business.

Was checking this article out for ideas: https://www.greatwestvans.com/best-rv-range-hoods/

Anyone upgrade their exhaust fan to something more quite AND moves the same or more CFMs?

CHeers, Michael
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Old 08-13-2022, 03:45 PM   #2
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The real problem with these range hood fans is there isnít enough room (height) to do much in, plus the static pressure loss because the air has to turn 90 degrees as it slings off the blade tips. And they used a 4 bladed fan (never use a 4 bladed fan when itís installed in a square box).
A forward curved squirrel cage fan would work awesomely as it would be quieter except for 2 caveats - it needs a scroll around it to operate efficiently, and the motor would have to be in the inlet where it would be exposed to the grease particles that the filter would allow to slip through (kind of a no-no when it comes to vent hood exhausting).
A radial bladed fan could be used, and doesnít need a scroll, but the motor is still in the air stream and radial blade blower wheels are noisier. Plus you would have to get one that doesnít have 4 blades, and an inlet Venturi is really needed for a radial.

I looked at fitting a tangential fan into ours. The beauty of a tangential fan is it turns the air 90 degrees already, and the motor is somewhat out of the air stream. The static capability of a tangential fan isnít real high so didnít get far enough down the road with the design to try to implement and determine results. That might be a winter project for me.

Not the answer you were looking for Iím sure. These MoHo vent hoods were a bad design from the start - and the bad design has not evolved beyond the original design since.

Same goes for the bathroom fart fans.
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Old 08-13-2022, 06:44 PM   #3
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On our previous trailer I Replaced the bathroom fan and rangehood fan with 12 volt computer fans {150 mm size. }They were virtually silent and were more efficient than the noisemaker oems. I also installed 2 of them to vent the air in the back of the refridgerator. . significant increase in the efficiency of the fri
dge.
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Old 08-14-2022, 10:39 AM   #4
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I simply don't use it and turn on the nearby maxaire fan instead. At 30-50 % speed it exhausts far more air and is almost silent.
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Old 08-14-2022, 10:46 AM   #5
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There are a few of these left on Amazon. It replaces all the fan/light and utilizes the factory switches on the hood. The company went out of business when the owner died. This would not stop me from getting it, because the difference is night and day regarding performance of the light and the fan. If something croaked on it I'd probably try to source the individual parts from the original parts vendor that supplied Fabulous Fan manufacturer. Took me about 2-3 hrs to do the whole retrofit....I probably spent a little more time to really try and do a real tidy job.




https://tweetys.com/fabulous-sam-1-8...grade-kit.aspx
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Old 08-15-2022, 06:55 PM   #6
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Quote:
Originally Posted by Dave Pelletier View Post
I simply don't use it and turn on the nearby maxaire fan instead. At 30-50 % speed it exhausts far more air and is almost silent.
X2
Less noise
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