A 20' x 72' tunnel with two All-Season Retractable Dome's, Rain Water Harvesting, and Side Door Entrances was installed at Case Western Reserve University's Squire Valleevue Farm in 2010. An additional layer of Poly and Tunnel Vision's Greenhouse Spacer Blocks have been added onto the structure to provide an 6" dead air space between layers for added insulation and reduced interior condensation. A beautiful farm worth a visit for anyone driving through Hunting Valley, OH.