Trusted by roofing professionals across Canada, the VMAX 300 series is the best quality roof vent on the market. With no moving parts, its unique design allows it to utilize the full effect of the wind to create a drawing power, thus eliminating any excess heat and humidity outside the attic space. The VMAX-300 series reduces the risk of ice damming, moisture condensation and the creation mold & mildew. Built using galvanized steel this vent is completely rodent proof. The unique height design and stormproof deflector system of the VMAX-300 series also reduce any risk of weather infiltration.