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Solar Heat Gain Coefficient and Visible Light Transmission

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Download the Guide

WHAT YOU NEED TO KNOW

  • How well the door prevents or allows heat from the sun passing through to the interior of the building
  • Selectable depending on whether you want the heat from the sun in to warm a space or block it to keep it cool
  • Warmer climates want a low SHGC (.06-.31) because they want to keep their buildings cool
  • Colder climates want this number to be higher (.45-.57) because they benefit from the free solar heat
  • Dependent on climate zone, shading and orientation

REFERENCE NUMBERS

  • Based on IECC C402.4.3 / ASHARE 90.1 / NFRC 200: 0.25 – 0.64
  • Dura-Glide GreenStar: 0.06-.57

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Automatic Door Package Configurations
Based on Sample Solar Heat Gain Coefficients:  

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Visible Light Transmission

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WHAT YOU NEED TO KNOW

  • How well the glass allows sunlight to pass through it
  • VLT is important for determining daylighting (the illumination of indoor space by natural light).
  • VLT can improve occupant wellbeing and productivity while lowering artificial lighting costs
  • Tied to SHGC
  • Dependent on unit size, glass-to-frame ratio and transmittance of the glass

REFERENCE NUMBERS

  • Prevents = lower VT and SHGC
  • Allows = higher VT and SHGC
  • Based on IECC C402.4.3 / ASHARE 90.1 / NFRC 200: 0.3 - 0.6
  • Dura-Glide GreenStar: 0.04 - 0.56Yellow-line-page-break-arrow-middle.png

Understanding NFRC Ratings and
Automatic Doors in Under 90 Seconds:

SIMULATIONS PERFORMED BY AN NFRC ACCREDITED LAB