We believe it is essential that any problem entombments dry out completely over time. This is why Franklin Wrap utilizes a two way ventilation system that works with your building. Temperatures differences inside and outside the crypt chamber create uneven air pressures causing the crypts to "breathe". Franklin Wrap takes advantage of this by providing a vehicle that air may pass through and is also impervious to crypt gnats.
This is a photo of an installed filter with the protective cover off. We have used micro mesh monofilament screening to assure longevity. The vent has a self adhesive backing that meets the rigorous requirements of the defense department.