Purlin Hoophouse Upgrade Set Length:20ft Heat mats are designed to

Heat mats are designed to reliably warm the root zone between 10-20˚F above ambient air temperature

(Only guaranteed to fit Bootstrap Farmer Trays

and all mounting screws

(10) Clear Humidity Dome

Want to learn more about lock channel

Purlin Hoophouse Upgrade Set Length:20ft Heat mats are designed toAdds a set of purlins to the left and right side of the ridge pole to your hoop house. Recommended for high tunnels and hoop houses at least 20' wide in high wind areas. Required for high tunnels and hoop houses greater than 20' wide. Sold in increments of 20 feet, which cover the left and right runs that go parallel to your ridge pole. Includes Ridge Poles Hoop Cross Connectors Endwall Cross Connectors Bolts & Nuts