Search  for anything...

AC Infinity Inline Duct Fan Silencer 8", Noise Reduction Muffler

  • Based on 774 reviews
Condition: New
Checking for the best price...
$89.99 Why this price?
Labor Day Deal · 78% off was $399.99

Buy Now, Pay Later


As low as $15.00 / mo
  • – 6-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

FREE 30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.


Availability: In Stock.
Fulfilled by Amazon

Arrives Tuesday, Sep 8
Order within 8 hours and 28 minutes
Available payment plans shown during checkout

Protection Plan Protect Your Purchase
Checking for protection plans...

Size: 8"


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: 8 inches | Length: 14.75 inches | Weight: 6.00 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: Alloy Steel, Aluminum


UPC:


Manufacturer: AC Infinity


Item Highlight: Silencer for 8" Inline Duct Fans, Aluminum and Galvanized Steel Build, Indoor Hydroponics Grow Tent Ventilation Systems See more


Brand Name: AC Infinity


Manufacturer Part Number: AC-DSA8


UPC: 819137021075


Manufacturer: AC Infinity


Item Highlight: Silencer for 8" Inline Duct Fans, Aluminum and Galvanized Steel Build, Indoor Hydroponics Grow Tent Ventilation Systems


Global Trade Identification Number: 75


Number of Items: 1


Model Number: AC-DSA8


Unit Count: 1 Count


Material Type: Alloy Steel, Aluminum


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Sep 8

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • 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

  • Love this and it works as intended
Size: 6"
I have this added in a 2x4x5 tent. I originally was running a crappy vivosun 4" fan and filter because of Reddit and boy did my girls suffer. Everyone online says one cycle every 1-3 minutes. They're nuts, you want to cycle once a minute or more if you're doing air exchange for cooling. I have my AC at 70 and with the vivosun running full speed the tent was hitting 84-87. With this 6" setup and the controller 67 at 70% during day 30% at night the tent never gets over 72-74 during the day and 65-68 at night. What an amazing improvement overall. For the silencer, I am using it in front of the fan that is working as an exhaust and most people are probably going that's wrong but it's absolutely right for me. I had it configured in the other fashion and it sounded like a jet engine in the tent. In this setup it sounds like swooshing air and I love it. Best decision ever made now I have to dig my 8" out of the ceiling of my closet and attach a 8" silencer to it. ... show more
Reviewed in the United States on August 8, 2021 by Harry Reyes

  • 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

  • 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

  • Good product
Size: 4"
Works perfect and arrived just in time.
Reviewed in the United States on August 24, 2026 by Almir

  • Second one!
Size: 4"
This is my second purchase. If I need something from AC infinity, I usually order it from their website if I do not immediately need it so I can build points. However, I needed this ASAP. This silencer helps cut down on noise and it looks cool as hell. Cheers!
Reviewed in the United States on February 24, 2026 by Sam11B

  • Highly effective
Size: 8"
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. AC Infinity sells 8 inch silencer clamps which is a tube of thick rubber and a clamp at each end. This cuts down on sound and they make your setup look really clean. Another clamp was needed for my filter, just fyi. They are not the most secure things though, especially because the fan shrouds are plastic and flex a bit. Note: if you really want this in silver, you may need to request it. Mine came in black, but still looks great. ... show more
Reviewed in the United States on November 1, 2023 by scuba steve

  • 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

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...