Air admittance valve recommended for installation in bathrooms, stairwells, attics. Improves the discharge capacity of gases from interior sewage systems. Reduces discharge noise. Ensures proper wastewater evacuation. -Air flow capacity: 14 l/s -Air tightness tested at: 10 Kpa -Temperature range: 0 – 60C Internal plate prevents odor penetration into the room. During wastewater evacuation, a vacuum is created that leads to plate movement allowing air introduction into the stack, thus avoiding water fluctuation in traps. -Diameter range: 75 – 110 -Retractable but detachable mechanism (guarantees pipe inspection) -Suitable for indoor and outdoor installation -Can be mounted on ceiling or inclined (reliability guaranteed by spring system) -Can be installed on existing systems. -Insensitive to wind.