I need some quieter INLINE CENTRIFUGAL fans, any advice?

The fans I have now are just too damn loud. Im trying to do a stealth grow and need the room to be pretty quiet. Anyone know of some high quality, quiet inline centrifugal fans? I need two fans, either a 4" or 6" one to cool my sealed hood and one to scrub a room about 1000 sq ft. Must be very quiet! I cant find any...

i run the vortex 6" and am amazed at the low sound level. i also wrapped them in an insulation blanket and suspended them on bungee cords to further help.

Recently added a 8" Hydrofarm with a filter to my room. I sprung for insulated ducting to go with it and after the ducting was put on and the panda film walls put up you can barely here it standing in the room with it. The bathroom is right next to my grow and you cant hear it thru that wall or anything either.

Well you could build a box out of plywood, line it with acoustic foam (egg crate foam), cut holes for the fan flanges to fit through and mount the fan inside, from what Ive heard it works very well, if interested there are many DIY plans on Google: (-->CLICK HERE<--) however if your not a DIY'er you could just get one of these duct mufflers: (-->CLICK HERE<--)

Here...I use the Active Air fan (the quietest). As others posted, if you need quieter, use a muffler.

http://www.youtube.com/watch?v=4TglPdylDzQ

BBB1974 said:

Here...I use the Active Air fan (the quietest). As others posted, if you need quieter, use a muffler.

http://www.youtube.com/watch?v=4TglPdylDzQ

Click to expand...

I use the active air too. Not too loud, but coupled with a speed regulator, just what your looking for.

I like the Valuline by C.A.P! True to Cfm rating, super quiet, and really affordable. I'm gonna upgrade and add a 6" to my flower room real soon.