Greenhouse Roof vent automatic opener
Greenhouse Roof vent automatic opener at HorticultureSource.com -
Greenhouse Roof vent automatic opener Allows for automatic controlling of greenhouse temperature to provide ideal growing conditions, even when no one is at home No batteries or electricity required May be adjusted for different opening temperatures Easily installed; simply replaces existing vent arm One-year warranty; average life is several years. MSRP: $54.99