Received our EKO 40 boiler last week. Managed to get it safely positioned in the outside boiler house and remove the steel shipping pallet . It's amazing what one motivated person and a good pry bar can do! I have had a good chance to look the boiler over and somehow I cannot find the secondary air adjustment. The diagram I have indicates that it is behind the fan casing just below the fan. Is there something else that I must remove before I can get to it?