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VVentamatic CX64WUPS 4-Inch by 16-Inch Soffit/Undereave Vents (24-Pack), White, All Aluminum Construction Provides Durability and Prevents Rust, Fully Screened for Protection The most efficient attic ventilation allows a constant flow of air in and out of the attic through a balanced system of intake and exhaust vents. Intake vents are installed in the lower portion of the roof at the eaves or soffits, and exhaust vents are installed at or near the roof ridge, creating a constant upward draft of air which helps to equalize attic temperature with the temperature in the living space below. This constant airflow helps to reduce the strain on cooling and heating systems, and also helps the efficiency of ceiling insulation. Correct installation and location of vents is important. These soffit and undereave vents provide excellent intake ventilation to provide "balance" to attic exhaust ventilation. They enable constant airflow through the attic when combined with attic exhaust vents and function as an essential component of well-balanced attic ventilation systems. Key Features All aluminum construction provides durability and prevents rust Fully screened for protection against insects and rodents Under eave vents have pre-drilled holes for easy installation Specifications Material Details: Aluminum NFA: Offers 22 sq in Dimensions: 4" x 16" with a 2.24" x 14.25" flange Unit Weight: 3 Lbs