What is the recommended action for a ventilation air intake that is too close to a property line?

When a ventilation air intake is too close to a property line, the recommended action is to relocate the intake. This action is crucial for several reasons. First, proximity to a property line can lead to air quality issues due to potential contamination from neighboring properties, such as exhaust from vehicles, pollutants, or other harmful substances. By relocating the intake, you can ensure that the air being drawn into the building is cleaner and safer for occupants.

Additionally, building codes often have specific requirements regarding the placement of air intakes to mitigate these risks. These codes are designed to protect the health and safety of individuals within the building by ensuring adequate separation from potential sources of pollution.

The other options, like increasing screen size, reducing intake capacity, or installing a filter, do not address the fundamental issue of location. While these measures might provide some level of mitigation, they do not solve the inherent problem of an intake's proximity to potential contaminants. Relocating the intake is the most effective solution to ensure compliance with safety standards and to maintain good indoor air quality.