It is a manual ventilation device, that is used in greenhouses without electricity supply to achieve ventilation by manually rolling up the film.
Description：It is a manual ventilation device, that is used in greenhouses without electricity supply to achieve ventilation by manually rolling up the film.
Phone：+86-18232831701
It is a manual ventilation device, that is used in greenhouses without electricity supply to achieve ventilation by manually rolling up the film.
