A Seriously Different Window

SeriousWindows R480 Series exceeds every performance requirement of the U.S. Department of Energy’s R-5 Volume Purchase Program – saving building and homeowners more money and delivering greater value than other qualifying windows.

SeriousWindows Outperform

Performance Categories	Department of Energy Volume Purchase Program Required Spec	R480 Series Double Hung	R480 Series 2-Lite Slider (XX)	R480 Series Casement	R480 Series Picture	R480 Series Patio Door
R-value	>=4.5 (operable) >=5.0 (fixed)	5.0	4.76	5.26	6.25	4.76
U-value	<=0.22 (operable) <=0.20 (fixed)	0.20	0.21	0.19	0.16	0.21
Air Infiltration (cfm/ft2)	<=0.30	0.04	0.16	<0.01	<0.01	0.13
Structural Rating	R-25 or higher	LC-30	LC-35	CW-55	CW-50	LC-25