{"title":"Window opener","description":"\u003cp\u003eA greenhouse window opener uses a wax cylinder that expands as the air warms, pushing a roof vent open without power or a controller. It closes again as the space cools. Opening temperature is adjustable, and one unit typically serves one vent panel.\u003c\/p\u003e","products":[],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0953\/8581\/3378\/collections\/greenhouse_window_opener.webp?v=1769527257","url":"https:\/\/greenhouse-shop.co.uk\/collections\/window-opener.oembed","provider":"Greenhouse","version":"1.0","type":"link"}