Automatic Vent Opener - Standard Emitterline and Fittings the tape will naturally break

the tape will naturally break down

absorbent medium—ideal for seed starting

or wildlife in the area

This 30-foot-wide format is especially well-suited for large-scale market gardens

Automatic Vent Opener - Standard Emitterline and Fittings the tape will naturally breakIngenious temperature sensitive device that automatically opens and closes coldframe lids, greenhouse windows and even skylights. Works throughout the day and maintain a constant interior climate, something impossible to achieve by manual adjustments. Requires no batteries or electricity. It can be adjusted to start opening between 60 77F. Fully open at 86 90F. Fully closed at 55F. Strongly recommended for all our glazed season extenders because it