830 Thermal / Optical Performance*

Maximum Thermal Efficiency

High Solar Gain & Thermal Efficiency (South/Southwest Facing Building Elevations)

Sound Dampening And Thermal Efficiency

* Cardinal XL Edge Dual Seal Insulated Glass Units With Argon Gas Fill Airspace Without Internal Grids
** Aluminum Spacer Single Seal Insulated Glass Unit With Argon Gas Fill Airspace Without Internal Grid

“U” Factor: The rate of heat flow through a given glazing. The lower the number, the better the insulating quality.

Solar Heat Gain Coefficient: The fraction of direct solar radiation that enters a building thru the glass as heat. Lower numbers means the glazing lets less heat in..

Visible Light Transmittance: Measures the amount of light transmitted through the glass. VLT is expressed as a number between 0 and 1. The higher the VLT, the more light is transmitted.

Sound Transmission Class (STC): A rating of a material’s ability to resist airborne sound transfer at the frequencies 125 – 4000 Hz. A higher STC rating blocks more noise from transmitting through a partition . Changes of +/- 3 are just perceptible; +/- 5 clearly noticeable; +/- 10 twice (or half) as loud. Loud speech can be understood fairly well through an STC 30 wall.

830 AAMA Certified Window Performance Ratings