Automatic Greenhouse Window Opener

For roof vents weighing up to 12lbs, approx.30" x 24" (76cm x 61cm). Can be clamped onto aluminium greenhouses - no need for any drilling. If a mor...

Easy to fit. This cylinder is filled with a wax that expands in warm temperatures - it can be set to start opening from around 12*C / 55*F up to 75...

Bayliss guarantee their openers for 2 years but if anything should go wrong after that replacement cylinders are readily available and easy to fit....

This reliable vent opener works by a wax within the cylinder of the opener expanding when it's hot, pushing a piston to open the window. When it co...

Dimensions: 8inch (20.5cm) long main body (including brass nut). For roof vents weighing up to 12lbs, approx. 30inch x 24inch (76cm x 61cm). Exert...

For side windows up to approx.36" x 24" (92cm x 61cm). Bolts on to aluminium greenhouses (fixings supplied) - for wooden greenhouses it is attached...

Fully Automatic - Opens your roof vent as the temperature rises maximising ventilation and air circulation. Fully Adjustable - Has an adjustable ...

Easy to fit - Designed specifically to fit the Palram Canopia Louvre Window. Automated - Automatically opens the louvre window, it also has a rel...

For large roof vents weighing up to 35lbs.  Bolts on to aluminium greenhouses (fixings supplied) - for wooden greenhouses it is attached by wood sc...

For roof or side windows in severely exposed positions weighing up to 14lbs, approx.30" x 30" (76cm x 76cm).  Bolts on to aluminium greenhouses (fi...

Unique, ultra strong, finned aluminium cylinder with both internal and external finns - this gives a more efficient heat exchange between the wax i...

Designed for aluminium or timber framed vents measuring up to 60cm square (2ft square) lifting a load of up to 6kg (14lbs). Provides a maximum open...

Easy to fit. This cylinder is filled with a wax that expands in warm temperatures, it can be set to start opening from around 75*F up to 90*F. Le...