I am planning on building a cold frame that will be either 6 feet by 2 feet
or 4 feet by 2 feet. I would also like to install a solar activated vent
opener on the box. Most commercial units of this size seem to have 2 - 3
lids (vents). Is it possible to have only one vent in the middle that is
about 2 foot by 2 foot in size....is this enough ventilation. My main goal
is to get away with only buying one vent opener.

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--Shannon Hughes