Hi! I just finished building a MASSIVE rock fireplace that's all fake. No Chimney, No flue, just a firebox for vent-free gas logs. It really looks nice, like those big fireplaces at Cracker Barrel Resturants. I even have a huge mantle that I made from a black walnut log from a tree that blew down on a neighbor's property a couple of years ago. I'm getting ready to build a walnut dining table next...ANYHOW...my bro-in-law said he had to take out his propane ventless logs because they stunk up the house. Other people I know say they are no problem. My bro-in -law switched to natural gas and says that fixed his problem. He also changed his log set, so don't tell me about orifices and pressure, I already know all that. I figured he probably had a stopped up burner that was leaking un-burned gas through a seam somewhere. ANYHOW...What's your guys preferences? Do Propane venless logs stink or not?