Ventilation outlet query

[jimbobdaz]

Hi all, i recently changed from using a tent indoors to my recently refurbished garage... everything seems great but i would like to muffle the sound of the air from the outlet. The air is pushed out of the grow room into a cavity between the old garage door and a stud wall i built... my idea is to attach an old carbon filter to the outlet, would this work? If not, any suggestions from you grow geniuses here would be greatly appreciated.
Thanks in advance

 

[Old Salt]

Silencers are available. My usual source has them in 4" and 6" sizes. It wouldn't be too hard to convert two old filters into a silencer. All you'd need is one of those egg crate style mattress pads. Strip out the abused carbon and inner screen, then insert the mattress pad.

 

[jimbobdaz]

Thanks for the reply Old Salt, so the carbon would need to be removed? why is that? ...air flow would be restricted as it's an pre used filter I guess

 

[Old Salt]

I don't know if the carbon needs to be removed. The egg crate mattress pad takes the place of the carbon in the commercially made silencer I have. The silencer has two flanges instead of the one on a filter. Here a couple of images:

6" Silencer

Inside the 6" Silencer​

 

[jimbobdaz]

Ah I see what you mean, but aren't these silencers more for keeping down the sound of the fan rather than the sound of the air venting out of the grow room?

 

[Old Salt]

No, they just cut the sound of the air flowing through the ductwork, and exhaust. It cuts the sound by at least 60%.

 

[jimbobdaz]

Thanks again Old Salt... as the noise level is pretty low anyway, 60% less would be perfect. I will look into getting a silencer or making modifications to my old filter