Positive Pressure Protection (PPP)

Multiple fans are also useful in a method known as Positive pressure protection or PPP, also known to some fire fighters as a positive pressure sandwich.

High-volume VENTRY Fans are not just for PPV of single family residences! They can be used to greatly delay the spread of fire through pressurization of adjacent areas in multiple-room structures such as apartments and condos, schools, malls, hotels and motels, and row houses. beyond single family residences.

For example, if a fire is burning in one shop of a strip mall, pressurizing adjacent stores with multiple fans can prevent the fire from spreading into them. As in the case of the mall above, fans were used at two locations, one of which pressurized unaffected areas of the mall and controlled the flow of smoke, channeling it toward the exit instead of into all the shops in the mall.

Click here to read about an amazing mall experiment in which PPP was used. Six VENTRY Fans were used to protect and ventilate the largest mall in Seattle and are now kept on-site for smoke removal.