3 x available. Unused. Boxes open and tatty as been on site but unfitted. Monsoon Energysaver™ Wall Positive Input Ventilation System SMPPS/W is a white, continuous vent style unit designed to improve air quality in your home. With its wall-mounted design, this unit from Monsoon works to create a positive input ventilation system, ensuring a healthier environment by constantly exchanging air. Ideal for improving heating and cooling systems, this energy-efficient solution is a practical addition to any home in need of better air circulation.