I went up on the roof and measured the existing chimney flu. The inside dimensions are a generous 18" by 10" which will allow our fireplace opening to be quite large, somewhere around 38" by 44".
We managed to remove the old metal heatilator in the afternoon too. The three amigos helped me - Jose', Hose B and Hose C.
See you later, heatilator !
I'm thinking, for mixing cement tomorrow, maybe we can use some other hoes, eh?