On Sep 3, 10:09*am, JimT wrote:
On 9/3/2011 12:34 AM, DD_BobK wrote:









On Sep 2, 11:59 am, *wrote:
I bought a high velocity floor fan with metal blades (model 9220). On the
fastest setting, the fan vibrates slightly, but it has rubber bushing between
the fan and the feet, so the vibration is isolated.

However if I wedge the fan in a window to use as an exhaust fan, the whole house
starts to rumble since the fan cage is touching the window frame.

Is it common for this type of fan to vibrate due to off balanced blades? I don't
see any counter balancing weights on the fan blades. I imagine they would look
like those on a car wheel. I also don't see any holes drilled on the blades
(another way to balance)

Is there a kit for balancing fan blades?

If fans blades are not balanced, I wonder about 40 inch fans or large. Wouldn't
they vibrate so much they break themselves down?
My recent experience with "low cost" fans (esp Air King) has
been .......poorly *balanced fan blade assembly& * unacceptable levels
of vibration.

http://www.homedepot.com/buy/buildin...-venting-cooli...

cheers
Bob

I have two upper-end fans that needed balancing. Fortunately. balancing
fans is a pretty simple job. Is there some brand you recommend? It
always seemed to me price made little difference when it came to
balancing. But I've never spent more than a couple of hundred on a fan.

Jim-

I have no brands to recommend.
It seems like the quality of fans has declined greatly over the years
independent of price.

Gresham's law applied to fans.

cheers
Bob