AC InfinityNoise Reduction Clamp 4-Inch, Duct Coupler with Stainless Steel Clamps, Flexible Rubber Coupling for Inline Fans and Carbon Filters in Growing and HVAC

I got this for a 4" exhaust fan in a small grow box and it works great. I have it in between the fan and a carbon filter. The rubber is very thick and does a great job of reducing noise from vibrations of the fan. The clamps that come with it are solid and keep a tight seal on the fan and filter.All of their products are fairly priced and this is no exception. Quality product at a great price makes this a must have. Nothing to dislike about this product whatsoever.

Creates a solid seal and removes the need for tape. Good product. Nice addition to setup.

Sin ruido del filtro al extractor

Very well made, easy to install, and makes joining my inline duct fan to the pipe much easier. I take the fan off about once a year to clean it...had been re-securing with foil tape each time, but now I can just un-clamp and re-clamp these fittings to remove the fan. Also helps in reducing the noise vibration from the fan. Diameter is good for 4" applications.

I was amused by the fancy packaging for a rubber clamp, they even thought to use a foam insert to prevent deformation. The clamp fit my Vortex Profilter flange snugly, but was actually a bit loose on the AC Infinity Cloudline S6. A little pre-tightening of the clamp prior to insertion solved the issue.These really simplified the process of building my DIY Air Purifier.