You have a very good point about the air intake and thank you for taking notice. I've been reading that the openings
should be more oval than round and I think mine are certainly more oval than they should be so I will correct that and
see how it reacts.
I had to laugh when you mentioned and commented about the " manual damper" and I wondered about that myself.
I guess without a manometer, Im not really certain how much to turn it and when.
Thanks for everything buddy