Inline Duct Fan Silencer, 150mm Noise Reduction Muffler Blower

My house air filtration system incorporates Merv13 + hepa + carbon cylinder + RAM 150mm fan + 8 meters of ducting. The noise at the outlet was 73db. Installed the silencer about halfway in line. Noise dropped to 63db (almost half audible). Unfortunately, air flow reduced by 10% - in my system went down from 3.0 m/s (85 m³/h) to 2.7 m/s (76 m³/h). Note that my RAM is rated at 517 m³/h, and the real life readings are due to multiple filters restricting. The airflow is just about enough for two people.

Beautifully built and finished but there is a huge flaw to this product. I have the 150mm version but have discovered that both inlet and outlet ports are oversize preventing me from using the two brands of ducting that I have on site. This is part of an air extractor system in a building so I need a long term installation so don't want to use pvc ducting and am sticking to aluminium. The ports are not oversize by much, measured today at 151.5mm but this makes it impossible to use aluminium duct and plastic fittings do not fit the internal diameter due to the generous thickness of the steel used in manufacture. Strangely I also have their excellent 150mm duct fan and that is a true 150mm and installed without issue. To avoid having to abandon the job I have boiled the ends of two plastic elbow fittings in a pan of water and sweated them into the silencer ports. It was a lot of work and alsonneed securing by rivets and in theory at least the modified fittings will reduce ny airflow a little. Again this is an outstanding product I am sure if used with soft PVC ducting but with all the extra work involved to get around the oversize ports I have to give it a low score.

didn't do that much on high speed but for low speed did some worth mentioning the 6 inch came black ( it's a new model ) i think it's much better but easily get scratched

Je pensais acheter un filtre à charbon mais surprise je reçois cet objet réducteur de bruit et la je me demande pourquoi Ac Infinity vend ceci à part. J'ai commandé l'extracteur, la gaine plus le manchon silencieux et je me retrouve sans aucun filtre pour ma tente après avoir dépensé 2 bras Bravo des vrais champions plus qu'à acheter un filtre neuf

Bra kvalité allt testat och allt fungerar som förväntat

Super quiet

Just installed a Panasonic ERV which is quiet and well built. The output fresh air picks up turbulent air noise from the flex duct and is annoying and too loud to be comfortable. I switched from 6 in accordion flex duct to flex smooth aluminum duct but still too noisy. I checked with Chat GPT and it suggested an inline muffler. Found the AC Infinity muffler, order and arrived next day. Just placing the muffler over ear attenuated almost all sound. Installed easily and immediately at the termination end of duct exit port. Sound is much quieter, appears to be 65/70 % attenuation. The howling sound is mostly gone and only the sound of air flow left. I would buy again without hesitation. Very pleased.