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AC Infinity Inline Duct Fan Silencer 6", Noise Reduction Muffler

  • Based on 778 reviews
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Availability: 12 left in stock
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Arrives Wednesday, Oct 14
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Size: 6"


Features

  • A duct muffler designed for use with inline fans in grow tents, bathroom fans and other HVAC applications.
  • Features dual aluminum flanges to help absorb sound waves from fan vibrations and airflow.
  • High-quality neoprene foam in an egg crate pattern that will reduce fan noise by up to 50%.
  • Galvanized steel body that is corrosion-resistant and can withstand extreme temperatures.
  • Duct Opening Diameter: 6 inches | Length: 12.87 inches | Weight: 3.90 pounds

Description

AC Infinity is a technology company that specializes in environmental controls for agricultural and HVAC applications. Our smart controllers and integrated grow equipment are designed to work together to create the perfect climate for your plants. Product Description A ventilation ducting tool designed to dampen or reduce noise coming from airflow in grow tent or server closet ventilation systems. It utilizes high-grade neoprene foam crafted in a wave crest pattern that diminishes sound wave movement, reducing noise pollution by up to 50%. The egg crate foam muffles sound vibration while allowing maximum airflow passthrough for both intake and exhaust configurations. Both aluminum flange openings also assist in absorbing sound waves from vibrations, seamlessly fitting over your inline duct fan’s flange. Each silencer is built with a solid galvanized steel body that is corrosion-resistant and can withstand extreme temperature changes. Applications The duct silencer is often paired with inline extractor fans in grow tents and hydroponic grow room applications. It can be installed anywhere in the ventilation system chain like in between the fan and ducting. The silencer can also be used in many home HVAC applications including AV equipment room cooling, closet cooling, and bathroom ventilation. This creates a comforting home environment that is quieter and more relaxing, or a workplace that is less distracting. An inline duct silencer designed to reduce noise from active exhaust fans. Eliminates noise level by up to 50% by absorbing acoustic vibrations caused by air movement. Whether you are ventilating a grow tent or a server room, inline fans produce a sound that may draw unwanted attention as well as disturb your housemates, family, or even your neighbors. By using this silencer, you create a quieter and more relaxing environment by diminishing the noise output of your fan or rushing air. This silencer features aluminum flanges on both ends that fit your existing fan or ducting to help diminish sound waves coming from fan vibrations. As sound travels through the chamber's foam, it's dampened by the wave crest form, cutting noise output from rushing air or the fan by up to 50%. With no obstructions in the silencer chamber and an egg crate pattern foam, air can be taken in or exhausted with no impact on CFM. A strong, long-lasting body made of galvanized steel that is lightweight, resistant to corrosion and can take on extreme cold or heat.

Brand: AC Infinity


Material: Aluminum


Item Weight: 2 kg


Shape: Round


UPC:


Brand Name: AC Infinity


Manufacturer Part Number: AC-DSA6


UPC: 819137021068


Manufacturer: AC Infinity


Item Highlight: Silencer for 6" Inline Duct Fans, Aluminum and Galvanized Steel Build, Indoor Hydroponics Grow Tent Ventilation Systems


Global Trade Identification Number: 68


Number of Items: 1


Model Number: AC-DSA6


Unit Count: 1 Count


Item Weight: 2 kg


Material Type: Aluminum


Shape: Round


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Oct 14

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews


  • Must have
Size: 6"
I’ve installed a few of these now and the overall experience is just better with them. One of the biggest sources of noise I noticed wasn’t even necessarily the fan itself, but the sound bouncing around inside the walls of the tent and through the ducting. I had one setup with a silencer installed right next to another without one, and the difference was big enough that I decided I might as well pick up a few more for the rest of my setups. Now I’m at the point where basically everything has been “silenced.” Of course, when you’re standing in the room you can still hear everything humming along, but all of those crazy loud, annoying sounds are gone. It turns multiple tents full of equipment into much more of a steady background hum. Definitely worth it for me. ... show more
Reviewed in the United States on September 15, 2026 by Lindsay

  • Works very well.
Size: 6"
Huge difference. I was thinking about returning the S6 fan because of how loud it was. The silencer, though expensive is well worth it if you’re set up is in an audible location.
Reviewed in the United States on September 28, 2026 by 8325818470

  • Perfect for venting a sound booth
Size: 4"
Purchased for a fairly novel use: ventilation for a Whisper Room isolation booth. I am a professional audiobook narrator and require a very low noise floor. Unfortunately, in the past, I've been relegated to quiet computer fans, which simply do not replace enough air in a small space that I spend hours in at a stretch. This fan has been a game changer. With the old computer fan system, I'd end the work day partially asphyxiated - literally. Overly tired, light-headed and confused. Not good! Changing to this fan, I'm probably replacing the air in the booth several times per hour, meaning everything about my performance has drastically improved. The best thing? I can't hear the fan *at all*, and neither can my audio equipment. My noise floor is -72dB with this fan on the fourth setting. Over all, I couldn't be happier. ... show more
Reviewed in the United States on September 19, 2025 by Charles J. Winston

  • Fits 4” PVC radon pipe and deadens the sound of the fan.
Size: 4"
I am using this on my radon 4” PVC exhaust pipe to reduce the fan noise and it works great. I had been looking for a muffler that I could use on a 4” PVC pipe and they are hard to find. This one fits nicely and is sealed with silicone caulk to the pipe. I would have rather had a muffler made out of PVC but there are none out there that I could use. This muffler is made of steel so time will tell how well made it is and if it has a zinc coating under the paint. Would buy again. ... show more
Reviewed in the United States on October 19, 2025 by OLNJ

  • Reduced noise from HVAC fan and return vent
Size: 6"
Made a difference in the noise from our HVAC. The unit and a return is right behind our TV room and we could hear the fan running - I put this in the line between the HVAC unit and the return grate in the room and it made a noticeable difference to me. Installation was very easy if you know what you are doing. ... show more
Reviewed in the United States on January 15, 2026 by Hoosier B

  • Does what it's supposed to!
Size: 8"
Perfect and easy solution for silencing a fan. Build quality is great. Airflow is great.
Reviewed in the United States on October 4, 2026 by Jays

  • Does exactly what it says, silences. It doesn't blow or suck, pun intended.
Size: 6"
Really does drop the noise by A LOT. your mileage may vary, but I had it installed on the intake before the fan as an exhaust and full speed doesn't feel like I'm next to a wind tunnel, it sounds about the same as a small desk fan. No one posted a video of the difference, so I'll include one. Sound also appears to be very quiet on the downstream near the exhaust. ... show more
Reviewed in the United States on November 17, 2025 by James

  • Does what it says, poor execution of details, non-discreet packaging
Size: 4"
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. ... show more
Reviewed in the United States on October 19, 2021 by Jordan

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