I am currently decorating a downstairs room and have removed the Gas Fireplace aswell as the surround. I am now left with a hole in the wall. Money is tight so we have looked at putting in an Electric Fire complete with surround.However, I am wondering how I should seal the hole in the wall so that the new fire can sit flush against it. Will I also need to vent the sealed chimney ? I am quite stuck so would welcome some advice. Thanks.