Nicely reduces the fan noise.
Glad to have installed this. The sound level is much lower. We replaced an older Tamarack with a ‘Quiet Californian’, which moves more air but was louder than the Hv1000... which lasted about 20 years, btw. I don’t have decimal measurements, but without the muffler the fan was very intrusive when you watch TV, etc, and with the muffler it was a background noise and no trouble at all.
Rating: 5 stars