I have a 75,000 btu unit from Janitrol. After seven years the shaft on the Venter Blower bent and needed replaced. The contractor said the part was redesigned. The new blower is very loud, it can be heard upstairs, and sucks so hard that the unit will not always light (I think it pulling the gas away from the burners before they can ignite). After three visits by this contractor I had a second contractor called in. He called Janitrol because he couldn't fix it either. They had him alter the installation design and it seems to be working, but it is still very loud. Last Janitrol I will own.