This is the use of outside air being brought in to reduce the amount of humidity that you have inside or to remove water vapor. The good thing about this approach is that it is always easy to then convert it over to a Closed Drying System should outdoor weather conditions change during the duration of the job.
The benefits of a Closed Drying System is it allows the Lap Services technician the most control over the drying area and process. With the isolation of the area from the outside or even the rest of a building, it allows for more security measures and allows you to install the necessary dehumidification equipment. You can also use existing HVAC systems to help with this process. If the outdoor humidity level is high, this is also the recommended approach by Lap Services professionals.
This approach is best used at the beginning of the job, as this is when the humidity levels indoor are at their highest. Also, you can use the Outdoor Drying Process while you are getting ready to remediate the inside. This means while you are removing any debris and doing initial cleaning.