Signature Flight Support - MDW contracted JaCor to redesign and replace their existing weather seals. The top header seal was completely missing, leaving a 3'5" wide x 172' long gap across the top of the door: equivalent to an 8' wide x 8' high door open year-round. Similarly, the vertical bulb seals were not effectively sealing against the building or between the two hangar door panels. The existing weather seals were replaced with JaCor's nylon inserted weather seals. The flexibility of the weather seals allowed the doors to move freely up and down, and the strength and durability of the weather seals will enable them to be effective for years to come.