Product review (4 stars): Instructions are very poor and customer service is unhelpful.
This is a nice well made product however the instructions are missing most of the needed information. The mounting bracket for the chimney is very hard to install. The fan makes a horrible noise due to the baffles on the fan which also had no instructions on how to install. When i called the company to get instructions they confirmed the baffles were a problem and said i should just remove them if i had baffles on the roof unit. I asked them to tell me where i could find the instructions for the mounting plate and exhaust. They agreed they were not listed in the instructions and could not provide me with any instructions for these items.  You need to be very mechanically inclined to install this fan with the lack of instructions.