A Zenport SH3222A three tier plant growing shelving station helps to maximize the growing space inside your greenhouse. The shelving station with three removable durable shelves that hold potted plants and seed trays is perfect for growing plants inside a greenhouse or on a sun porch. The greenhouse shelving system is constructed of sturdy green paint finish tubular steel and shelving with a green polyresin powder coat finish. Easy to assemble and take apart for storage. Self assembled shelving is 27 1/4-inch wide by 19 1/4-inch deep by 29 1/2-inch tall. Stackable. No vents.