Prevent condensation issues in your attic with this Maximum ventilation roof vent. Unlike turbine models, this slanted roof vent doesn't require rotation to prevent water or snow from infiltrating your home. It has a unique patented deflector system that can capture wind velocities as low as four miles per hour. Want to keep out pesky rodents and birds? No problem, this roof vent is fitted with wire mesh. Draw stale air and moisture out and replace it with fresh air through the soffits of this model 301 roof vent. With a recommended roof ventilation capacity of 1000-1200 square feet, one of these vents can replace three 12" or two 14" turbines.