AC Infinity Inline Duct Fan Silencer, 4" Noise Reduction Muffler Blower Silencer for Indoor Hydroponics Grow Tent Ventilation Systems

I’m using this for residential crypto mining with an 8 inch S8 fan. It is crazy loud, but still quieter than the fans on the mining ASIC. Before buying this, it was just too loud to run at night, costing me income. The fan needs to be at least on level 8 during the day to cool the hash boards, and that is really loud in a residential area. For grow tents, you probably won’t need to run it at level 8 unless you need a jet intake in your tent for some reason.This is perfect. It is so effective that I can run the fan at 7, maybe 8, even at night. It also doesn’t restrict the air flow much at all, and temperatures are not affected. I have an 8 inch duct filter on the end, and it’s even more quiet.Oh yeah, and don’t use duct tape. It defeats the purpose a little since sound will get through the joints. AC Infinity sells 8 inch silencer clamps which is a tube of thick rubber and a clamp at each end. Not only is this more secure and cuts down on sound, but they make your setup look really clean. Another clamp was needed for my filter, just fyi.Note: if you really want this in silver, you may need to request it. Mine came in black, but still looks great.

It really cuts down the noise from the fan, I can run it two settings higher with this. To my ear the tone sounds better too

What's that noise is not what you're going to say after installing a silencer on both ends of your inline. Coupled with noise reduction clamps to have you trying to figure out if you're hearing the inline or the clip on AC Infinity Cloudrays. Easy to install, nice snug fit with the AC Infinity noise reduction clamps, heavy duty feel with the performance and luxurious look of AC Infinity products. Recommended for those that want a quiter growing experience.

I had wondered when the description said it "will reduce fan noise by up to 50%" whether this meant the sound power was reduced by 50%, a 3-dB reduction in power, which would be hardly noticiable, or it it meant the apparent sound was cut in half, which is more like a 10-dB reduction in sound power (hearing is non-linear). I can report that it appears to be more like the latter, since the noise reduction is significant.

Why did you pick this product vs others?:Works well

Does what it's made for , making the fan quiet so you can sleep and or the neighbors don't hear

I was able to hear my 8" carbon scrubber running upstairs from my downstairs grow, definitely annoying. I'm not one that likes constant humming noises or resonating noises. I ordered this thinking it'd be alright.. This thing literally worked and I have the same performance on my system with no noise upstairs anymore, at all..Definitely if you're going for stealth & calm consider getting one or more of these in your system. Especially if you're running an "open scrubber" setup where its just an inline fan sitting on a carbon filter like me. You put this on the top of the inline fan thats on the carbon filter and it makes it wayyy quieter. Different fans vary in how quiet they get though like the hyperfan I have is plastic sooo it makes noise itself but the actual fan noise is non existent upstairs anymore.Not going to lie the metal on the unit is kinda weak and came dented in, it didn't effect function, only kinda annoying to look at.. But ¯\_(ツ)_/¯ what can ya do I don't have time to deal with customer support and returns all that shenanigans over $65.

The product does what it says, reduces air flow noise from/through ducting. Don't expect it to reduce noise from a fan itself (motor noise).Like others have stated, my product came with dents. That dispute any poster's comments regarding these products being "well packaged." Maybe the others are, but this one isn't. There is foam in the box on the top and bottom of the device, but none on the sides at all. Any impact or pressure on the sides of the box will dent the product. Get on that AC Infinity, should know better by now.And on packaging, this product DOES come with labels on the outside clearly stating what it is. If you live somewhere that discreet packaging is important, this can be a big issue. Get on that AC Infinity, should know better by now. These are simple fixes.