Stainless Steel 3.25 x 10" rectangular wall vent for microwave venting, kitchen venting, and other exhaust applications. Includes spring loaded damper with weather seal and stainless mesh screen to deter animal and bug entry. High quality 304B stainless wall vents will resist rust in corrosive or salty environments and therefore will last and prevent costly vent and siding replacements. Heavy duty construction with spring damper and screen to prevent cold air infiltration and pests.