![Question on residential utilities closet: I understand proper amount of ventilation is needed but is this duct that vents from attic space into the utility closet, (with furnace and water heater) necessary. Question on residential utilities closet: I understand proper amount of ventilation is needed but is this duct that vents from attic space into the utility closet, (with furnace and water heater) necessary.](https://preview.redd.it/question-on-residential-utilities-closet-i-understand-v0-l0qldhb7kwc81.jpg?width=640&crop=smart&auto=webp&s=58957c809f486cf05f2eeb4df209add377b003eb)
Question on residential utilities closet: I understand proper amount of ventilation is needed but is this duct that vents from attic space into the utility closet, (with furnace and water heater) necessary.
![Should my furnace closet have this huge duct opening into the unconditioned vented attic? - Home Improvement Stack Exchange Should my furnace closet have this huge duct opening into the unconditioned vented attic? - Home Improvement Stack Exchange](https://i.stack.imgur.com/6CBXm.jpg)
Should my furnace closet have this huge duct opening into the unconditioned vented attic? - Home Improvement Stack Exchange
![Should my furnace closet have this huge duct opening into the unconditioned vented attic? - Home Improvement Stack Exchange Should my furnace closet have this huge duct opening into the unconditioned vented attic? - Home Improvement Stack Exchange](https://i.stack.imgur.com/7g5PM.jpg)
Should my furnace closet have this huge duct opening into the unconditioned vented attic? - Home Improvement Stack Exchange
![House Works: Furnace room needs ventilation aside from outside air that equipment will draw in | Ottawa Citizen House Works: Furnace room needs ventilation aside from outside air that equipment will draw in | Ottawa Citizen](https://smartcdn.gprod.postmedia.digital/ottawacitizen/wp-content/uploads/2014/05/steve-maxwell-installs-wall-panels-basement-instea.jpg)