whats the opinions on flue dampers?well.... first off whats there purpose?do you recommend them on an older airtight?my dad always ran one so i installed one when i put the stove in.i had found another forum before this one and they were dead set against them,so when i installed all new stove pipe i removed the damper.now i'm wondering if that was a good move.since i'm unsure of its purpose in life i don't know whether i'm missing something not having one.thanks......jeremy