1. Omega Corporate Center, Pittsburgh, PA

TingWall 65 System (non-thermally broken extrusions) is used on this project. To the surprise of many experts, there has been no interior water condensation problem since the project completion in 1999. Possible explanation: Unknown theory of Airloop effects.

2. IBM Renovation Project, Rochester, MN

TingWall 75 System (pour-and-debridged extrusions) is used on this project. According to the calculated and tested CRF, some minor degree of interior watercondensation is expected in the extreme cold winter condition in MN. To the surprise of many experts, there has been no interior water condensation problem since the completion of first phase project in 2000 and the improvement of the interior comfort level in the renovated area is highly noticeable by the occupants. Possible explanation: Unknown theory of Airloop effects.

3. E-Park I Twin Tower, Taipei, Taiwan

TingWall 65 System (non-thermally broken extrusions) is used on this project. Taiwan is in the semi-tropical zone and most curtain wall systems use nonthermally broken extrusions. In the summer, by hand touching, the interior surface temperature of TingWall frame on the wall exposed to the sun is noticeably cooler than that of other curtain wall system in the adjacent building. Possible explanation: Unknown theory of Airloop effects.

4. Possible Theory

a. In TingWall system, the Airloops are interconnected over the entire wall and are linked to the exterior air over rain deflecting elements, the behavior of the air within the Airloops is unknown in the current theoretical model for thermal calculations.

b. Air is known to be a good thermal insulating material. In the cold region, the near still air within the Airloops could provide significant insulating value to eliminate the interior water condensation problem as demonstrated in Item 1 & 2 above.

c. In the hot region with solar gain condition, when the air within the Airloops reaches a high level, the air particles would become active producing chimney effect resulting in the venting of the hot air within the Airloops. This effect may explain the behavior of Item 3 above.

d. The above behaviors seem to gimmick the expensive Double Wall System.

5. It is known in the industry that the biggest killer of thermal insulating value of a curtain wall system is the water leakage problem as demonstrated in the IBM Renovation Project (see the attached letter from Project Architect). Therefore, specifying a high thermal insulating value does not mean too much if the threat of water leakage problem can not be eliminated.