The Terrain Pleura 50 and 100 air regulators provide ventilation to branch pipework.  

When used with the P.A.P.A.^® (Positive Air Pressure Attenuator), the system can replace extensive ventilation pipework, saving costs in material and installation, allows more flexibility in the layout and design of internal drainage systems for engineers, architects and design professionals.

The Terrain Pleura 50 air regulator provides ventilation to branch pipework.  It is generally installed on the pipe behind the appliance trap. The Terrain Pleura 50 opens and admits fresh air into the branch pipe when the negative (suction) pressure occurs from an appliance discharging into the pipework system. This equalises the ambient air pressure within the pipework and protects the trap seal.  When the flow stops and the internal ambient air pressure in the pipework balances, the Terrain Pleura 50 closes by gravity and prevents foul air entering the built environment.

The Terrain Pleura 100 air regulator can be fitted on to the top of a foul or waste stack, or at the end of long low gradient branch drains, to provide ventilation.  The Terrain Pleura 100 opens and admits fresh air under condition of reduced pressure in the discharge pipes and prevents trapped water seals being drawn.  As the internal ambient air pressure in the pipework balances, the Terrain Pleura 100 closes by gravity and prevents foul air entering the built environment.

^®P.A.P.A^® is a registered trademark owned by Akatherm BV, part of the Aliaxis Group