I'm looking at installing an old dual-fuel wood/gas cookstove in my house. We heat with a woodstove so I am quite familiar with that particular animal, but a cookstove is something different. The cookstove has an oval outlet from the back. Most of the pictures I've seen of wood cookstoves in kitchens seem to either have the flue coming straight up out of the stove, or if its coming out of the back it immediately makes a 90deg bend to straight up. The stove would be up against an exterior wall, and I'll have to put in a metal chimney for it. Is there any reason not to have the thimble at the level of the stove outlet and just run straight through it horizontally (then make the bend to vert outstide)? I mean rather than have it exit the stove, bent to vert, come up a few feet, bent to horizontal and go through the thimble, then bend to vert again..