How does it work? Thermostats control the blowers which inflate the Poly-Vent curtain. When temperatures inside a building get above the desired temperature, the bottom blower shuts off, causing the bottom tubes to slowly deflate and collapse. This creates a small top opening and allows fresh, outside air to enter the building. When more ventilation is called for, the top blower automatically shuts off. The remaining tubes will partially or fully collapse until the desired temperature is reached.
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