For commercial buildings, how must air exhaust and intake openings be protected?

In commercial buildings, protecting air exhaust and intake openings is crucial for ensuring proper ventilation and safeguarding building systems from contaminants and wildlife. The correct answer involves using corrosion-resistant screens. This is because these screens are designed to withstand the harsh conditions typically present in commercial settings, such as exposure to moisture, chemicals, and varying weather conditions, which can lead to rapid deterioration of unprotected materials.

Corrosion-resistant screens help prevent rust and decay, extending the lifespan of the screens and maintaining the integrity of the ventilation system. They also effectively block debris, pests, and other unwanted materials from entering the building, which is vital for maintaining indoor air quality and preventing damage to HVAC units.

Other materials, such as plastic or fiberglass, may not provide the same level of protection against environmental stressors. Metal screens might offer some durability but without the added corrosion resistance, they could quickly become less effective in environments that promote rust and degradation. Therefore, using screens specifically designed to resist corrosion ensures not only compliance with safety and health regulations but also enhances the overall efficiency and maintenance of the building's ventilation system.