Moved into an old drafty, rental house with an FF-402 installed in very good shape. Have not seen anything on the web about the 402. It looks like the users manual has been removed everywhere due to lack of EPA compliance. Does anyone have any advice on proper use for efficiency? Trying to figure out the right balance for the fan versus bellows. We are on the dry side of the cascades and using very dry wood. Landlord said the chimney had been cleaned two years ago.