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The XA-Series Greenhouses from Poly-Tex provide unparalleled natural ventilation. With the integrated Poly-Vent natural ventilation system on both sidewalls and ridge vent, the XA-Series will provide plants with all the fresh air they need. Built tough with heavy-duty galvanized steel tubing, the XA-Series is available in 21- or 30-foot widths as either freestanding or gutter connected. Flexible glazing, heating, cooling and benching options allow for custom configuration.