MEPF Cambodia 92 Questions 38 Answers 7 Best Answers 9 Points View Profile 0 MEPF Asked: October 28, 20202020-10-28T03:15:40+00:00 2020-10-28T03:15:40+00:00In: MEP Questions What is a Positive Air Pressure Attenuator (P.A.P.A™)? 0 What is a Positive Air Pressure Attenuator (P.A.P.A™)? p.a.p.apositive air pressure attenuator Share Facebook 1 Answer Voted Oldest Recent MEPF Cambodia 92 Questions 38 Answers 7 Best Answers 9 Points View Profile Best Answer MEPF 2020-10-28T03:16:25+00:00Added an answer on October 28, 2020 at 3:16 am Air flow is just as important in a drainage system as water flow. Longer vertical drainage stack lengths associated with high rise structures can cause a change in air flow to the drainage system. Air flow is essential to maintain proper trap seals which keep smell and sewer gases from entering into living or working spaces. Pressure transients are waves of pressure within a drainage system caused by positive or negative air flow. Negative air transients are capable of sucking water out of trap seals and positive air transients are capable of forcing air through the trap water seal. The Positive Air Pressure Attenuator (PAPA) acts as an air expansion tank to absorb positive air pressures to balance the drainage venting system. Positive Air Pressure Attenuator (PAPA) features: Air pressure equalizer for high-rise drainage systems Protects against positive vent stack air pressure in mid to high rise building structures – four floors or higher When used in conjunction with the Maxi-Vent™ this combination provides complete protection from positive and negative pressures in a drainage system When installed as a complete engineered system no vent stacks are required to vent through the roof, no matter how tall the building, reducing roof leak potential Reduces conventional vent piping and saves installation and material costs By reducing the need for vent piping through floors the need and cost for fire stop devices is reduced as well as the risk of fire spreading between floors Easily retrofits into existing drainage systems to help solve positive pressure problems Rated for 5 psi and operating temperatures -40°F to 150°F P.A.P.A. air capacity per unit: 1 US gallon 0 Reply Share Share Share on Facebook Share on Twitter Share on LinkedIn Share on WhatsApp Leave an answerLeave an answerCancel reply Featured image Select file Browse Save my name, email, and website in this browser for the next time I comment.