I recently installed a Quadra Fire 1200i and am not sure of the proper operation especially concerning the combustion or exhaust blower. When a fire is 1st started, the exhaust fan is on at high speed then when it warms up it shifts to a lower speed. This seems normal but is still very noisy and sparks are flying around inside the fire chamber at a pretty good rate. My question is: does the exhaust blower ever turn all the way off once the fire is going good? It seems that once a good draft is going, the blower is no longer needed.