Achieve the maximum ventilation possible on hot and humid days with a high tunnel roof vent to encourage natural air flow. This unique roof-installed ventilation system provides a chimney-effect movement of hot air out of the tunnel. Vent is constructed of a durable 8mm clear polycarbonate twin-wall panel mounted on a sturdy, white, powder-coated aluminum frame that measures 32" x 17". #greenhouse #gothicarch #gardening #ventilation Roof Vents, Hot And Humid, Greenhouses, Etiquette, Flow