I have a room that I would like to convert into a home office. The room is located off of the garage. In order to get through the room one has to go through the garage. It does however share a common wall with the living area of the house. The room is approx 12x12 and there is a closet inside the room that contains the hotwater heater. I want to extend an AC duct to this room. The room has no windows and as i stated earlier the door to the room opens up to the garage. Does anyone see that the lack of ventilation will be a problem in regards to the AC duct or carbon monoxide from the hot water heater? Installing a window is probably not possible. My home is brick and i dont have the skills or tools to do it.