The built-in wall vents 491 are equipped with storm blinds. They are attached invisibly in the wall opening with wall anchors or clip springs (small dimensions). Are used for applications the require a good water-resistance and low air flow, or where there is a lot of wind.
*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.