U-Factor Guidance To Minimize Unwanted Heat Flow Through Your Door
For better Thermal Performance
Overview
THE BASICS

Everything you need to know about u-factor and automatic doors in 90 seconds: 

WHAT YOU NEED TO KNOW

  • Heat flows from warmer to cooler bodies.
  • Doors lose heat to the outside in  the Winter and gain heat from the outside during the Summer
  • 1" insulated glass can reduce the U-factor by up to 40%* by better preventing interior heat from escaping to the outside
  • Depends on size, temperature and components of the door

REFERENCE NUMBERS

  • Colder climates want a low UFactor (.52) to resist heat loss
  •  Based on IECC C402.4.3
  • ASHARE 90.1
  • NFRC 100: 1.10 - .77 BTU (hr) (F temp differential)*
  • Dura-Glide GreenStar Range 1.04-.52

 

* Typical 14' bi-part with Solarban 60 Air or better. Thermal values will vary with glass type selected, glass to aluminum ratio and environmental conditions on site.
Applications
COLDER CLIMATES CAN PREVENT HEAT LOSS

1. U-FACTOR 0.52 Recommend: Bi-parting 192” x 92” or Single Slide 108” x 92” with transom. 1” SB60 argon glass, 4” bottom rails, no muntins, narrow stiles

2. U-FACTOR 0.62 Recommend: Bi-parting 168” x 92” or Single Slide 96” x 92” with transom, 1” glass with SB60 air glass, 10” bottom rails, 2” muntins, narrow stiles

3. U-FACTOR 1.03 - 1.04 Recommend: Bi-parting 168” x 92” or Single Slide 96” x 92”, 1/4” glass, no transom, 10” bottom rails, 2” muntins, narrow stiles

 

Simulations performed by an NFRC accredited lab
Door Configuration
MAXIMIZE GLASS FOR BEST RESULTS

Configure your door with 4" bottom rails, no muntins, and narrow stiles.

NFRC Ratings
EVERYTHING YOU NEED TO KNOW ABOUT NFRC RATINGS IN 90 SECONDS