BAYLISS Mk. 7 variants and several autovent models from Thermofor - a standard model and a heavy duty double spring model for use in exposed locations.
Bayliss MK7 Autovent Automatic Greenhouse Vent Window Opener
Bayliss MK7 Automatic Vent Opener
Bayliss MK7 Solar Vent Control Opener-Greenhouse–Automatic Temperature Control
Bayliss MK7 Triple Spring Window Opener
Bayliss Mk7 Automatic Greenhouse Auto Vent Window Opener any Colour / Variety
Bayliss Automatic Autovent Greenhouse Window Opener x 2
