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RION GREENHOUSE AUTOMATIC WINDOW OPENERS Automatically opens and closes Roof Vent when temperature changes. The opener has a metal cylinder containing a mineral which expands when heated. This pushes a piston that opens the vent. As the temperature cools, the mineral shrinks and a spring closes the vent and resets the piston. The opening and closing of the vent is gradual allowing just the right amount of air flow for cooling.
*Shipping costs are calculated for orders shipped within the lower 48 states. If order is being shipped to anywhere other than the lower 48 states, additional shipping costs may apply. Contact our Customer Service Help Desk for questions.
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RionGreenhouseKits.com sells only the highest quality Rion Greenhouses for the home gardening enthusiast. The Rion greenhouse is the most durable and best-designed greenhouse kit on the market. In addition, the exceptionally attractive structure with its dark green color frame makes it a great asset to any home or garden. It is the easiest greenhouse unit to assemble, the best insulated greenhouse kit in its class, and above all it is the best value for your money--professional quality at a hobbyist price! |
