Vented wall furnaces installed between bathrooms and adjoining rooms shall not _______ air from bathrooms to other parts of the building.

In the context of vented wall furnaces, the primary concern is related to air quality and moisture control within a building. A vented wall furnace should be designed to maintain effective air circulation without transferring potentially contaminated air from bathrooms to other living areas. This is critical for ensuring that odors, humidity, and any other pollutants generated in bathrooms do not circulate into adjoining spaces.

When stating that vented wall furnaces shall not circulate air from bathrooms to other parts of the building, it underscores the importance of keeping the indoor air clean and healthy. Bathrooms often experience high levels of humidity and may contain contaminants that are unsuitable for other areas, making it imperative that these airflows are managed properly to maintain comfort and hygiene throughout the living environment.

While collecting, removing, or filtering air may involve handling air from bathrooms in various ways, it is the act of circulating air that poses a direct risk of moving undesirable odors and moisture into other spaces, which is against acceptable building and health codes. Thus, the correct answer focuses precisely on the prohibition against the movement of air from bathrooms to neutral or living areas.