Question: I have an older house which has a gas fireplace, it is bricked up and what I want to know is do I need a chimney for a gas fireplace, I would like to get this fireplace working again and would appreciate any help . I have no idea if this house used to have a chimney or not there is no evidence of one, please help. Answer: There are some gas fireplaces which are Vent Free, others that are direct vent (thru the wall) and still others that need a chimney to the top. Consult your local hearth professional for the best solution.<p> A bricked up chimney should be viewed as suspect. Many times the flues have been blocked with masonry or other debris. Some are also cut off at the roof level - in other words they terminate in the attic.<p> Make certain you have a pro look at this one!