{"product_id":"alton-thermofor-long-piston","title":"Alton Thermofor Long Piston","description":"\u003cdiv style=\"text-align: left;\"\u003e\u003ca href=\"https:\/\/moderngardendirect.com\/collections\/alton?grid_list=grid-view\u0026amp;filter.v.price.gte=\u0026amp;filter.v.price.lte=\" target=\"_blank\"\u003e\u003cimg style=\"margin-bottom: 16px; float: none; display: block; margin-left: auto; margin-right: auto;\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0886\/9396\/5106\/files\/alton-wooden-greenhouses_160x160.png?v=1735121081\"\u003e\u003c\/a\u003e\u003c\/div\u003e\n\u003ch4 style=\"text-align: center;\"\u003eAlton Thermofor Long Piston\u003c\/h4\u003e\n\u003cdiv class=\"container\"\u003e\n\u003cdiv class=\"row\"\u003e\n\u003cdiv class=\"col-md-4 d-none d-xl-block linksun lispace\"\u003e\n\u003cdiv class=\"product-tabs\"\u003e\n\u003cdiv class=\"tab-content responsive hidden-xs hidden-sm\" id=\"tab-content\"\u003e\n\u003cdiv class=\"tab-pane active\" id=\"tab_info\"\u003e\n\u003cdiv class=\"qMYqUG_convSearchResultHighlightRoot\"\u003e\n\u003cdiv data-is-intersecting=\"true\" data-turn-id-container=\"request-WEB:f44c781a-5de3-403d-836e-f68da82ba33e-4\" class=\"\"\u003e\n\u003csection data-turn=\"assistant\" data-scroll-anchor=\"false\" data-testid=\"conversation-turn-2\" data-turn-id-container=\"request-WEB:f44c781a-5de3-403d-836e-f68da82ba33e-4\" data-turn-id=\"request-WEB:f44c781a-5de3-403d-836e-f68da82ba33e-4\" dir=\"auto\" class=\"text-token-text-primary w-full focus:outline-none has-data-writing-block:pointer-events-none [\u0026amp;:has([data-writing-block])\u0026gt;*]:pointer-events-auto R6Vx5W_threadScrollVars scroll-mb-[calc(var(--scroll-root-safe-area-inset-bottom,0px)+var(--thread-response-height))] scroll-mt-[calc(var(--header-height)+min(200px,max(70px,20svh)))]\"\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:var(--thread-content-margin-xs,calc(var(--spacing)*4))] @w-sm\/main:[--thread-content-margin:var(--thread-content-margin-sm,calc(var(--spacing)*6))] @w-lg\/main:[--thread-content-margin:var(--thread-content-margin-lg,calc(var(--spacing)*16))] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:40rem] @w-lg\/main:[--thread-content-max-width:48rem] mx-auto max-w-(--thread-content-max-width) flex-1 group\/turn-messages focus-visible:outline-hidden relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col gap-4 grow\"\u003e\n\u003cdiv data-turn-start-message=\"true\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal outline-none keyboard-focused:focus-ring [.text-message+\u0026amp;]:mt-1\" data-message-model-slug=\"gpt-5-5\" dir=\"auto\" data-message-id=\"5e4b229e-572b-49b9-832f-fee237fbc39a\" data-message-author-role=\"assistant\" tabindex=\"0\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert wrap-break-word w-full light markdown-new-styling\"\u003e\n\u003cp\u003eThe Thermofor Louver Vent Replacement Cylinder is designed to restore smooth, automatic operation to your greenhouse louver vent opener. Compatible with Thermofor, Robinsons, and Alton branded louver openers, this replacement cylinder helps maintain proper airflow and temperature control without manual adjustment.\u003c\/p\u003e\n\u003cp\u003eInside the cylinder is a heat-sensitive wax core that expands as temperatures rise and contracts as they cool. This natural movement powers the opening and closing of your louver vents, improving ventilation and protecting your plants from overheating.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul class=\"content-p\"\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide compatibility:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eFits Thermofor, Robinsons, and Alton louver vent openers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRestores automatic ventilation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eKeeps airflow consistent and responsive to temperature changes.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeat-powered operation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eNo electricity or batteries required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplacement cylinder only:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eNo fittings or mounting hardware included.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePRODUCT TYPE:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eReplacement cylinder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCOMPATIBILITY:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eThermofor, Robinsons, and Alton louver vent openers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOVERALL LENGTH:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e7 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMETRIC LENGTH:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e170 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eINCLUDED:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eCylinder only (no fittings)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHow it works\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe cylinder uses a wax-filled core that reacts to temperature changes. As the greenhouse warms up, the wax expands and pushes the piston to open the louver vent. When temperatures drop, the wax contracts, allowing the vent to close. This automatic process helps maintain a stable growing environment throughout the day.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eMaintenance and Care\u003c\/span\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eKeep the cylinder clean and free from debris to ensure smooth operation. Periodically inspect your louver opener to maintain proper alignment and performance.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cspan\u003eFrequently asked questions\u003c\/span\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli class=\"content-p\"\u003e\n\u003cstrong\u003eWhat does a louver vent opener cylinder do?\u003c\/strong\u003e\u003cbr\u003eIt controls the opening and closing of your louver vents using heat expansion, helping regulate airflow and temperature inside your greenhouse.\u003c\/li\u003e\n\u003cli class=\"content-p\"\u003e\n\u003cstrong\u003eDo I need electricity or batteries?\u003c\/strong\u003e\u003cbr\u003eNo. The cylinder operates entirely on heat expansion, so it requires no power source.\u003c\/li\u003e\n\u003cli class=\"content-p\"\u003e\n\u003cstrong\u003eWill this fit my greenhouse vent opener?\u003c\/strong\u003e\u003cbr\u003eThis cylinder is compatible with Thermofor, Robinsons, and Alton louver vent openers. Always confirm your model before purchasing.\u003c\/li\u003e\n\u003cli class=\"content-p\"\u003e\n\u003cstrong\u003eWhen should I replace the cylinder?\u003c\/strong\u003e\u003cbr\u003eIf your louver vent no longer opens or responds slowly to temperature changes, replacing the cylinder can restore proper function.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cul class=\"content-p\"\u003e\u003c\/ul\u003e\n\u003c!----\u003e","brand":"Alton","offers":[{"title":"Default Title","offer_id":51211075682610,"sku":"ALTTHCY0002L","price":45.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0886\/9396\/5106\/files\/main-image-white-background_71d8867f-9015-4e6f-8527-950787720bc0.jpg?v=1779786416","url":"https:\/\/moderngardendirect.com\/products\/alton-thermofor-long-piston","provider":"Modern Garden Direct","version":"1.0","type":"link"}