For intermittent mechanical ventilation in enclosed parking garages, what kind of detectors are required for automatic operation?

For intermittent mechanical ventilation in enclosed parking garages, the requirement for automatic operation is primarily based on the need to monitor and manage harmful gases that are typically present due to vehicle emissions. Carbon monoxide (CO) and nitrogen dioxide (NO2) are two significant pollutants generated by vehicles that can accumulate to dangerous levels in enclosed spaces like garages.

Carbon monoxide is particularly relevant because it is a colorless, odorless gas that can lead to serious health issues or even fatalities in high concentrations. Its levels can often rise quickly due to traffic activities, making it essential for the ventilation system to activate when CO levels exceed certain thresholds.

Nitrogen dioxide is also a concern, as it is produced from combustion processes and can irritate the respiratory system. Both gases are critical indicators for ensuring a safe environment in a parking structure. Therefore, the presence of CO and NO2 detectors is vital in triggering the mechanical ventilation system to operate automatically to ensure proper air quality and safety within the garage.

In contrast, smoke and heat detectors primarily focus on fire hazards, while motion and light detectors serve more for security and energy efficiency rather than air quality control. Humidity and temperature detectors monitor comfort levels but do not directly address the presence of harmful gases produced by vehicles. Hence, utilizing carbon monoxide