{"product_id":"cast-iron-round-floor-ceiling-or-wall-grates-for-air-or-heat-vent-register-cover-with-damper-11-hole","title":"Cast Iron Round Floor, Ceiling, or Wall Grates for Air or Heat Vent. Register Cover With Damper, 11\" Hole Size, 13\" Overall Diameter (ZM-IR-1101)","description":"\u003cp style=\"margin:0 0 12px;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0813\/5799\/6269\/files\/SpecialShippingHeavy.png?v=1783708297\" alt=\"Special shipping required\" style=\"max-width:100%;height:auto;\"\u003e\u003c\/p\u003e\r\n\u003cp\u003e\r\n\t\u003cb\u003e\u003cfont size=\"2\"\u003eZM-IR-1101\u003c\/font\u003e  Round Cast Iron Grille 11\" Hole Size With Damper; 13\" Exterior Diameter\u003c\/b\u003e\u003c\/p\u003e\r\n\u003cp\u003e\r\n\tMade to fit into a 11\" round hole or duct, these grates have an exterior diameter of approximately 1\" greater than their boot size.  The flange measures 3\/16\", and is pictured in the side view photo.\u003c\/p\u003e\r\n\u003cp\u003e\r\n\tYou may need to modify for different mounting applications.\u003c\/p\u003e\r\n\u003cp\u003e\r\n\tSome resistance may be felt when opening and closing the cast iron louvers for the damper.  The friction helps to keep the louvers in a set position to your liking, and withstand normal increases in air pressure caused by higher fan speeds from heating and cooling units.\u003c\/p\u003e","brand":"0","offers":[{"title":"Default Title","offer_id":49995449467117,"sku":"ZM-IR-1101","price":363.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0813\/5799\/6269\/files\/ZM-IR-1101__Iron_Round_Grille_With_Damper.jpg?v=1779305286","url":"https:\/\/jn2vnf-0i.myshopify.com\/products\/cast-iron-round-floor-ceiling-or-wall-grates-for-air-or-heat-vent-register-cover-with-damper-11-hole","provider":"Vintage Hardware \u0026 Lighting","version":"1.0","type":"link"}