Posted 12/04/2008 at 03:24:20pm

Firefighters use Positive Pressure Ventilation to clear heat and smoke (a volume of gas) from buildings; they often use a single gasoline powered fan to clear homes, sometimes large, multi-story spaces. Why use an exhaust system, when you could "push" cooler air into the cabinet space, and have the air in the space not only go out a small(er) vent hole, but also the various vents/cracks in the cabinet? Is there an absolute advantage to the setup in the article? I had planned to use a PPV system in my cabinet, instead of an exhaust system, but now I am wondering which would be best?