Positive air pressure attenuator and air regulator for branch pipework ventilation.

Features and benefits:

Replaces 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.
Offers a point-of-need solution that quickly responds to transient air fluctuations.
Compatible with Terrain FUZE Stax (specified separately).
Note that valves are to be installed only on Terrain systems.

Terrain Pleura 50:

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 equalizes the transient air pressure within the pipework and protects the trap seal. When the flow stops and the internal transient air pressure in the pipework balances, the Terrain Pleura 50 closes by gravity and prevents foul air entering the built environment.

Terrain Pleura 100:

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 transient air pressure in the pipework balances, the Terrain Pleura 100 closes by gravity and prevents foul air entering the built environment.

Terrain P.A.P.A.

The Terrain P.A.P.A. is a positive air pressure attenuator, designed to mitigate the affects of positive air fluctuations in the drainage pipework system.

As water descends down the drainage stack it creates a negative pressure; if that flow is interrupted or is approaching a change of direction, the negative pressure changes to a positive pressure and moves up the pipe.
This low amplitude air wave travels typically at 320 m/s, the speed of sound. As the positive air fluctuation approaches the branch-off point for the Terrain P.A.P.A., the bladder within the unit reacts very quickly, within 0.2 seconds, and starts to expand; this creates a pressure differential at the branch-off point.
The branch to the Terrain P.A.P.A. then becomes the path of least resistance and the majority of the positive air pressure is absorbed within the unit.
As the transient air pressure within the pipework starts to equalize, the bladder slowly releases the small volume of air into the pipework system at only 12 m/s which will have no effect on the trap seals.

BBA Agrément Certificate - 18/5551