On the bottom of my stove is the mobile / modular home intake air hook up...when I was cleaning the bottom of the fan intake I noticed that this hookup pipe flange has a flap ( like a choke flapper in a carb)...and it was only open half way...When I was installing the stove I read the manual but skipped over the mobile home hookup section...so I missed the info on this flap...I'm wondering...should this flap be opened all of the way...Is this the main iair ntake for the stove...?????....I was opening and closing it and I did notice that the flame would vary with the flap position....I left it open as much as I could...seems to burn better...has a nice yellow flame with a blue base. I'm wondering why Thelin didn't mention this outside of the mobile home section in the manual..??