In 1876, the Globe Ventilator Company received a patent on the air register for which component?

• A. Wagon wheel
• B. Hole punch
• C. Roof ventilator
• D. Window screen

Answer: (C)

Air registers are devices that control how much air moves through a ventilation opening. In a roof ventilator system, the air register sits at the opening to regulate airflow, balancing pressure and preventing drafts as air moves in or out through the roof. The 1876 patent by Globe Ventilator Company was specifically for the air register used with a roof ventilator, making it the component associated with roof ventilation design. The other items—wagon wheels, hole punches, window screens—are unrelated to roof ventilation and don’t pertain to regulating air flow in a roof vent, so they wouldn’t be the subject of this patent.