Draw air in from the ground
ABS polymer 4" x 9.75" base vents allow fresh air to continually flow through your greenhouse. Mount a vent near the base in each corner for natural 'ground-up' cross ventilation. Close during colder weather to save heat. These vents are easy to install in your Solexx Greenhouse. Two base vents are recommended for every 4 feet of greenhouse length. Sold in sets of 4 or 6.