After I put it to the test, this industrial and scientific impeller kit proved to be a reliable addition to my HVAC equipment... I was impressed with the sturdy build and easy installation process which helped me get my system up and running in no time. the impeller kit worked silently and delivered uninterrupted performance, and I could hardly hear any noise. The only downside was the relatively high price of the kit, but it was worth the investment for its quality and durability..