If your a member there, why don't you want to do it the way they do? The way any forge with an electric blower I've ever seen does? Use a gate valve or even a ball valve on the air. And let the blower run full RPM.Yes I've read that and I'm a member
My forge which I have put in storage, is a coal or sometimes charcoal forge with an old hand crank blower. When still working I drove through a steel mill area, on that made it's own coke, the coke was transported by rail over top the road. So I would stop and pick up coke that fell out of the gondolas when they took a load to the blast furnace.