I ordered our intake dampers for the fire box tonight. We will have two 7" dampers.
I saw them on Ebay in a 5" and I sent him a message and he is going to make them for me in 7" so we can meet the intake requirements for our pit. The will be laser cut from 1/8" steel plate. We aren't close to starting the fire box yet but I would rather have them in advance for when the time comes.