Ventilating hoods and exhaust systems shall be ________ installed in commercial applications and to vent industrial equipment.

Ventilating hoods and exhaust systems are essential in commercial applications and for venting industrial equipment because they ensure the safe dispersal of fumes, gases, and heat generated by gas appliances. Proper installation of these systems is crucial for maintaining air quality and preventing hazardous conditions, such as the buildup of combustibles or harmful gases.

The correct answer emphasizes that these systems are permitted and necessary for venting gas appliances, illustrating compliance with safety regulations and standards. By facilitating the safe evacuation of combustion by-products, they protect both workers and patrons in commercial environments. This proper ventilation is vital for preventing potential risks associated with gas appliances, such as carbon monoxide poisoning and fire hazards.

In contrast, other options either misrepresent the requirements or limit the scope of the ventilation systems, failing to address their importance in ensuring a safe operational environment for gas-fueled equipment.