★★★★★
Prices start at : 46.47 USD / each
The vent arm was designed with a metal cylinder containing wax which expands when heated to push a piston, which raises the window, as the air gets warmer, then contracts as it cools, closing with the use of a spring and resetting the piston.
- ✓ Suitable for all Palram greenhouses and easy to install
- ✓ Solar powered, heat activated - start opening point: 54-59 F degrees
- ✓ Opens roof vent automatically as temperature warms for air circulation and heat relief, Closes when temperature cools
- Product Depth (in.): 2.75
- Returnable: 90-Day
- Product Height (in.): 2