Silent extractor fan

[Ppple]

Hi, I need a new fan extractor for my grow box, I have a 5" fan, I'm searching for the most silent, but not insonorized, I use a variac to dim it.

I see can fan 5" rs
Vents tt125 pro

Any others?

 

[St. Phatty]

I miss electronics surplus stores.

They always had things like that - centrifugal fans etc.

 

[window]

A KSA fan turned down with a variac is whisper quiet , at least the 4-5 inch are, I use a 6 inch one now and is still very quiet.

 

[Ppple]

How about the version with speed controller in it? They make noise?