I bought a used 25-pdvc stove as my second stove. I got a great deal on it and am looking forward to installing it. In the instruction manual it mentions an outside air supply as mandatory. It states that it must be installed. The old owner did have it installed but I failed to take it with me since my other stove does not utilize outside air at all. I was under the assumption that I only needed to use it in a mobile home installation scenario. What should I do?