I bought my house 3 yrs ago and recently decided lets use this fire place. Its free heat why not. I noticed after doing research that there is no i think they call it flute? thats what i can open or close to let air out or not. I noticed there isnt one in here and now see why the first floor is always so cold. Any suggestions what to do. I saw some dumb balloon u can put there but its like $50.