Re: [Amps] Suggestions to quiet a blower

[R.Measures <r@somis.org>]

On Aug 15, 2004, at 7:46 AM, Ed Briggs wrote:

> A perennial question..
>
> I'm considering trying to quite down the blower in my Al-1200.  I am 
> using the stock  EBM G2S085-AA which is a single inlet centrifugal 
> blower which I run at top speed since it is only a 31 cfm blower at 
> 0".  From what I've seen, it is the quietest of it's type,  spec'ed at 
> 37 dBA.
>
> I *think* (and that's why I'm soliciting suggestions) that there are 
> two primary sources of noise in this installation. One is mechanical 
> vibration, which I'm thinking of one of several approaches:
>
> a)  Mount a rubber 'mouse pad' between the fan and the chassis, or
> b)  drill out the mounting holes in the chassis, and install rubber 
> grommets to isolate the mounting screws from the chassis, then RTV or 
> silicon caulk round the perimeter of the blower mounting flange, or
> c)  any better suggestion

I would have the blower dynamically balanced at a balancing shop.
> The second source of noise seems to be a higher pitched noise that I 
> *guess* is related to the ball bearing and airflow. I imagine that 
> some sort of a baffle over chassis vents with several inches of 
> clearance would help. I've seen carboard boxes suggested.
I use a square of thick shag carpet mounted on wood paneling.

cheers, Ed

Richard L. Measures, AG6K, 805.386.3734.  www.somis.org

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