Is too much cfm a problem?

17 years ago

I am trying to replace our noisy Broan 164-K(70cfm, with light and heat, 3.5 sones) with a less noisy Panasonic Whisper series. The bathroom is really small-7X6 in total. We need only about 50cfm as per calculator on the Panasonic site. The only one that has a light and heat is rated at 110cfm (FV-11VHL2).

Finally my question, What can go wrong with having too much cfm?

will the fan blow stuff around or bring in cold air from outside?

Is there a workaround-is there a way to reduce the cfm of the fan?

or are there other models that will fulfill our criteria? All the ones that I can find in the 70-80 cfm range are as noisy as our current one. Suggestions?

Thanks

Vinaya

Featured Answer

MongoCT

17 years ago

If you want quiet, Fantech has a nice remote fan setup. No heat though. Still, they are worth a look.

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Comments (6)

MongoCT
17 years ago
I'm not sure how accurate Panasonic's calculator is, in terms of what criteria it takes into account when rating the fans.

Realize that in most installations there are static losses through the duct due to duct friction and bends in the duct.

If make-up air is limited, that'll reduce the effective CFM of the fan too.

A 110cfm fan should work fine for you.
vdinli
Original Author
17 years ago
Thanks, mongo! The panasonic calculator does take into account the kind of duct, length and number of bends. With those criteria-they recommend at least 70cfm for our bathroom. So 110cfm might not be too far off. but boy! they are expensive-350+$!
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kelpmermaid
17 years ago
mongoct, I've looked at the Fantech inline system for two adjacent bathrooms and am still thinking about it. Who would I get to install such a system? An electrician? I'm afraid my SO and I would kill each other in a DIY scenario, LOL!
vdinli
Original Author
17 years ago
Those Fantech look nice..maybe we will do that for our basement bath-when we remodel in a few months.
For now, I need to replace this fan in our main bath before it flies off with the house!!
vdinli
Original Author
17 years ago
I had a question about the Panasonic Whisper Warm-has anybody installed it on a 2X6 joist? It is going to go in an attic-so i don't mind if it projects out. Just want to make sure it can be mounted correctly.
I found a good deal on the WAM home centre site that somebody here recommended-for 230$..yay!