Chimney pipe wont budge....need some help & ideas

[LU229]

Hi Folks,

new to the site here.... having an issue with removing the 4inch chimney pipe off from my miller pg80 gas furnace in my mobile home. My brother was telling me it just slides up into the larger pipe that comes down thru the ceiling. Nothing is moving OR sliding, it just wont budge. Any ideas, or if i`m doing something wrong...? I sprayed some penatraiting oil around all the joints. I even tried a strap wrench to see if i could jar anything loose, and its a no go. I`m replacing the whole furnace with a brand new make and model of the same as the old one. Thanks for any advice in advance.

larry

[DaleM]

Cut it off with a Sawzall. It's rusted to the heat exchanger. You should also replace the roof stack along with the furnace.