The GrowIT Heavy Duty Greenhouse with roll-up side vents deliver quality construction, quick and easy assembly and best in class value. Featuring 1 5/8 in. heavy duty all-steel frame, patent pending ShelterLock Stabilizers, Ratchet Tite tensioning, and the Easy Slide Cross Rail System for a stable and durable greenhouse. The specially designed ClearView triple-layer, heat bonded RipStop translucent cover provides enhanced illumination for plant growth and protection. Roll-up side panels and half moons screen vents at each end provide optimal airflow and temperature control.