Jewlgurl, those fresh greens sound good 👍.
No automatic opener , that black rectangle is an automatic house foundation vent, works great. Still have to prop open top when days start getting fairly warm. The vents come in a couple of different sizes ( most home improvement stores.) I think under 20 dollars.
I have 200 named varieties, and approx 800 seedling, counting the 250 you see in the coldframe.
Meggosmith,
. You will enjoy a coldframe very much. Do your research, their are a lot of options out there. :thumbsup:. If done correctly they will last a long time.