{"product_id":"dayton-20ua91-louver-damper-adjustable-54-h-x-18-w","title":"Dayton 20UA91 - Louver Damper,Adjustable,54 H x 18 W","description":"\u003cp\u003e56.5 In.H 20.5 In.W Drnbl Extrd Alu Combo Dmpr, Louver Type Combination, Frame Type Flanged, Outside Height 53 1\/2 in, Outside Width 17 1\/2 in, Rough Opening Height 54 in, Rough Opening Width 18 in, Louver Maximum Intake 3,006 cfm, Maximum Exhaust 4,299 cfm, Flange Width 1 1\/2 in, Free Area 2.7 sq ft, Beginning Point of Water Penetration 1,118 fpm, Maximum Air Velocity 3,000 fpm, Blade Angle 45 Degrees , Material Aluminum, Inside Height 52 1\/2 in, Inside Width 15 3\/4 in, Number of Blades 11\u003c\/p\u003e","brand":"DAYTON","offers":[{"title":"Default Title","offer_id":43260481831006,"sku":"20UA91","price":1733.09,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0663\/7151\/8558\/files\/Z-oJywkcpEx_1bbe59d0-3edb-4e15-ae4f-316cf2a89d38.jpg?v=1788447606","url":"https:\/\/nationalboilersupply.com\/products\/dayton-20ua91-louver-damper-adjustable-54-h-x-18-w","provider":"National Boiler Supply","version":"1.0","type":"link"}