Open menu Menu Login My cart (0) High Tunnel Supplies Home / Collections / High Tunnel Supplies These high tunnel vent systems are roof or end wall installed systems that provides supplemental ventilation for extremely hot conditions. During moderate weather, high tunnels are generally vented by rolling up the sides and opening the doors on each end. However, extremely ... Show More Sort by Name: A-Z Featured Best sellers first Price: low to high Price: high to low Name: Z-A Name: A-Z Oldest to newest Newest to oldest Filter by Availability: All Availability: All Availability: Ready to ship Automatic Vent Opener starting at $54.95 Automatic Vent Opener Replacement Cylinder starting at $24.95 Bobbin Plant Hanger with Twine starting at $31.50 Dramm Water Timer starting at $14.95 High Tunnel 30" Vent With Automatic Opener starting at $269.95 High Tunnel Roof Vent with Opener starting at $279.95 High Tunnel/Greenhouse 12" Vent w/Auto Opener starting at $159.95 High Tunnel/Greenhouse 18" Vent w/Auto Opener starting at $226.95 High Tunnel/Greenhouse 24" Vent w/Auto Opener starting at $254.95 `); Join our e-mail list Sign up for money-saving special offers, growing tips and new product releases! My email address: Why Choose Harris Seeds? Harris Seeds is a privately owned seed company with a long tradition of supplying the finest vegetable seeds, flower seeds, plants and supplies to growers and gardeners since 1879. The Harris Seeds team includes local growers and garden enthusiasts, whose invaluable knowledge and expertise allow us to better serve you. Every Harris Seeds employee shares a common goal – a commitment to your success. Get to Know Us About Harris Seeds Reviews & Ratings Our Blog Careers Wholesale More Info FAQs Shipping Discounts and Credit Terms Downloadable Forms Refund and Return Policies Cookie Policy Privacy Policy Quick Order (Order by SKU) Resources and Guides Donation Requests Gift Cards Order Free Catalogs Keep in Touch Facebook Twitter Pinterest Instagram YouTube Contact Us Call Center Hours M-F: 8:00 am - 5:00 pm ET Phone: 800.544.7938 Fax: 877.892.9197 Email Us > Contact Your Account Rep > 355 Paul Rd. P.O. Box 24966 Rochester , NY 14624 © 2021 Harris Seeds MY WISHLIST