I know this has probably been brought up before but i didn't see it anywhere. Is there something I can do to lessen the noise of the air coming out the exhaust vent? I just started my first closet and have a 4" exhaust fan w/filter at the top of my closet which has a straight shot out my wall using 4" semi-flex metal duct. I currently have the fan on a power control but temps were running a little high so I had to turn it up a little which created a whistling through the vent cover. I temporarily took the cover off which stopped the whistling but it's still louder then I would like since it vents into the room. Sent from my XT1585 using Grasscity Forum mobile app
I have a new cover which eliminates the whistling. I guess what I was hoping for is a way that still exhausts the same amount of air but yet is quiet. Maybe by adding something or creating a bend in the duct Sent from my XT1585 using Grasscity Forum mobile app
Not really , it whistles because of restricted air flow , more pressure pushing out than can effectively pass through the cover think of a tea kettle bigger hole in cover should eliminate the whistle not a smaller one
Duct noise is such a pain in the ass. I still am learning my way around quieting duct noise. Does changing your duct size after your fan (going larger) with a larger vent have any real value?
At first I thought maybe adding a a normal 9*13 wall register would make a difference but I don't see how since right now it's the 4"duct flush with the wall without a cover. I will need to add the new one which at least doesn't whistle. I'm still exploring options and hoping someone has an idea Sent from my XT1585 using Grasscity Forum mobile app
I would think adding a 4" to 6" coupling then adding a short length of 6" duct might help but now I could be a space issue. I guess maybe run larger rectangular duct on the ceiling might help Sent from my XT1585 using Grasscity Forum mobile app
I bought a used hurricane 171 cfm fan and just the amount of air it flowed made to much noise. Even a fan controller didn't slow it down enough to be worthwhile. Fan controllers start to make a fan whine around 50-60℅ of full volume.