TC 4.5 is concerned with the identification and evaluation of all physical properties of:

(1) glasses and other glazing materials,

(2) shading and shielding materials and devices, and

(3) control devices and strategies which influence the radiant, conduction, and convection transfer of both heat and light through fenestration systems.

It is also concerned with the development of procedures for calculating and measuring solar heat gain, daylight admission, and heat transfer through fenestration systems.