Weve found these Bayliss Automatic Greenhouse Vent Openers to be the best on the market & are suitable vents for both wooden or aluminum greenhouse windows & frames.
With the two of the most important aspects of successful greenhouse growing being adequate ventilation & preventing excessive temperatures, the Bayliss XL Greenhouse Autovents are invaluable as they react to changes in greenhouse temperature & open & close vents accordingly. Please note that although the Bayliss XL Autovent will fit the vast majority of greenhouses, some models of Halls & Robinsons may require additional fixings. We also recommend the Bayliss MK7 Autovent for use on any Alton greenhouse structure.