Auto Vent Opener - 2 Pack Thirsty Earth It is knitted mesh with

It is knitted mesh with 93% light transmission

especially in winter

supporting robust plant growth

This complete bundle provides the extra-large giga-cells larger seedlings need

tent caterpillars and more

Auto Vent Opener - 2 Pack Thirsty Earth It is knitted mesh withStop chasing the weather. This opener automatically vents heat on warm days and closes to lock in warmth when its coolkeeping your greenhouse steady year round so your plants thrive. Key Features: Temperature activated design opens vents at 60 to 77F. Dual spring vents open up to 18 inches for better airflow, heat control, and stability. Powder coated aluminum and stainless steel for long term durability and weather resistance. Installs easily on most