I have a 25-PVD made 8/06. This is the first season running this stove as I had it sitting in a garage for a few years brand new. I have noticed that the room air blower on this unit does not change noticeably. The factory settings are at 5-5-1. These settings seem to run well. I always run the stove at 1-2 feed and 5-9 on the room air blower. On cold days I run the stove on 3 feed and 5-9 on the blower. However, seems like there is absolutely no difference on the blower speed if I have it set at 1 or 9 it blows out the same. Is this normal? How can I increase the room air blower to maximize the heat from this unit?