Ventilation systems with filters help trap pollens before they enter your home while delivering fresh air. While no filter can trap every impurity, filters such as the MERV 6 which can be used in Aldes heat and energy recovery ventilators are one way of reducing them from the air you breathe indoors. Check out the VentZone Zone IAQ with Heat Recovery Kits to see how these filters are incorporated into select Aldes products.