What is a notable benefit of continuous airflow in ventilated cage racks?

Continuous airflow in ventilated cage racks plays a crucial role in maintaining a healthy environment for laboratory animals. One notable benefit is its effectiveness in reducing ammonia levels. Ammonia is a byproduct of urine and feces, and its accumulation can pose serious health risks to animals, including respiratory distress and other toxic effects. By ensuring a constant flow of fresh air, continuous airflow systems help dilute and remove ammonia, thereby enhancing animal welfare and supporting their overall health.

In the context of the other options, while increasing temperature and humidity might have specific applications, they do not align with the primary function of ventilated cages, which is focused on maintaining optimal air quality. Promoting visibility within the cages might be a secondary effect, but it is not a primary benefit of continuous airflow. The main focus of these systems is to provide a safe and clean environment for the animals, making the reduction of ammonia levels a critical aspect of their design.