Collecting listings has surprises
Description (window opens). If the temperature Lower again (the cylinder cools down), the spring pushes the air rod back into the cylinder (the window closes).
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Working principle of greenhouse vent automatic opener: If the temperature of the greenhouse rises, the gas in the gas field will become hot, and the spring force will push it out due to the increase in pressure
Features
-Light weight and portable, easy to carry and storage.
-Durable and rust-proof in humid environments, with long service life.
-The automatic vent opener is suitable for most current garden greenhouses.