PERFORMANCE & TESTING
NFRC RATING | THERMAL PERFORMANCE
TYPE OF GLASS
(1 LITE) |
U-FACTOR |
SHGC |
AIR FILLED | PANEL SIZE 39" x 94" |
Clear-Air-Clear |
0.50 |
0.54 |
E180-Air-Clear |
0.39 |
0.45 |
E272-Air-Clear |
0.38 |
0.30 |
E270-Air-Clear |
0.38 |
0.27 |
E340-Air-Clear |
0.38 |
0.14 |
E366-Air-Clear |
0.38 |
0.21 |
ARGON FILLED | PANEL SIZE 39" x 94" |
Clear-Argon-Clear |
0.48 |
0.54 |
E180-Argon-Clear |
0.35 |
0.45 |
E272-Argon-Clear |
0.34 |
0.30 |
E270-Argon-Clear |
0.34 |
0.26 |
E340-Argon-Clear |
0.34 |
0.14 |
E366-Argon-Clear |
0.34 |
0.20 |
TRIPLE GLAZED - ARGON FILLED | PANEL SIZE 39" x 94" |
E366-E180-i89 |
0.25 |
0.17 |
E366-Clear-E366 |
0.27 |
0.17 |
U-factor gives the rate of heat transfer through the window-from inside to outside when it is cold and from outside to inside when it is hot. The lower the U-factor, the better the insulating properties, resulting in greater energy efficiency.
Solar heat gain coefficient (SHGC) is defined when sunlight hits a window and the solar heat is absorbed and subsequently released inward. The SHGC represents the fractional amount of the solar energy that ends up warming the house. The lower the SHGC, the less solar heat it transmits.