Hey Everyone ive tried to search for this answer but cant find it... i have a 500 gallon propane Tank... Gas is already removed... and a 250 gallon gas already removed...safe... im making a double propane stove inside my greenhouse which is a 20x100... i cant seen to find any 8 inch flue collars in my area to start my run from my homemade stove... I thought about using two 6" flue collars from my old barrel kits.. have two seperate stove pipes from the same stove... running up 8ft tall then going through the wall... would the two pipes be necessary or would the one 6"be enough... if possible... it would be nice if i could use the whole end as a door... anyone have any ideas? sorry for so many questions in one post.. and thanks in advance