Dual ball bearing system assures long-lasting quiet operation
    Aluminum construction
    Maintenance-free top and bottom dual bearing system
    Helps to fight heat and moisture buildup inside an attic as well as ice dams in cold climates
    Part of a balanced attic ventilation system for year-round airflow
    Multiple roof vents are usually needed to provide the required net free area
    Must be spaced equally over the roof to provide sufficient airflow along the entire roof sheathing
    Limited Lifetime Warranty