All purpose intake ventilation prepunched nail holes. Surface mount. Corrosion resistant. 16" x 4" vents have 26 sq. ins. of net free area. 16" x 8" vents have 65 sq. ins. of net free area. All purpose intake ventilation prepunched nail holes. Surface mount. Corrosion resistant. 16" x 4" vents have 26 sq. ins. of net free area. 16" x 8" vents have 65 sq. ins. of net free area.
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