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The 4mm thick polycarbonate panel of this outdoor greenhouse can withstand outdoor temperatures from -20℃ to 70℃, allowing enough sunlight to pass through and isolating most of the ultraviolet rays. The powder-coated aluminum alloy frame is more durable and will not rust. The panels allow up to 70% light transmission for optimal plant growth while blocking more than 99.9% of harmful ultraviolet rays. The ideal growing environment is large enough that you can grow a large number of plants and flexibly arrange your plants and flowers inside. Greenhouses protect your plants from frost and overheating, creating a greenhouse effect for optimal growing results.