Bayliss XL Greenhouse Window Opener garden watering Support beams on either side

Support beams on either side of the potting bench ensure a strong bench

The Deluxe version of the Original Wormery Composter includes everything you receive with the Original Model plus a stand

optimizing energy efficiency

9°C Humidity range 20 to 99% RH Construction ABS housing Display Digital readout

Bayliss XL Greenhouse Window Opener garden watering Support beams on either sideThis Bayliss XL is an extremely reliable automatic vent opener. The opener is activated by a stainless steel cylinder containing a mineral wax which expands with heat; this pushes a piston causing the vent to open. As the temperature falls the wax contracts and a strong stainless steel spring closes the 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