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DOE Completes Initial Analysis for Doors and Skylights

The Department of Energy (DOE) has announced that it has completed its initial analysis of technical and cost information for ENERGY STAR-qualified doors and skylights, and has put together preliminary ENERGY STAR criteria for these.

For doors, DOE officials say it is promoting separate criteria for swinging doors that capture the maximum energy savings possible and are compatible with the two-step manufacturing process.

Preliminary ENERGY STAR Criteria for Swinging Doors*
  2009 2013 2016
Glazing U SHGC U SHGC U SHGC
Opaque 0.21 NR 0.19 NR 0.16 NR
¼- and ½-Lite 0.25 0.30 0.22 0.30 0.20 0.30
¾-Lite and Fully Glazed 0.32 0.30 0.30 0.30 0.28 0.30
* DOE may revise these criteria as warranted by the ongoing energy savings analysis.

In addition, the DOE is proposing separate criteria for skylights, designed to highlight their technological potential, according to the DOE.

Preliminary ENERGY STAR Criteria for Skylights*
  2009 2013 2016
Climate Zone U SHGC U SHGC U SHGC
5 ≤ 0.50 NR ≤ 0.46 NR ≤ 0.46 NR
4 ≤ 0.55 ≤ 0.40 ≤ 0.50 ≤ 0.35 ≤ 0.50 ≤ 0.35
3 ≤ 0.55 ≤ 0.35 ≤ 0.55 ≤ 0.32 ≤ 0.55 ≤ 0.32
2 ≤ 0.57 ≤ 0.32 ≤ 0.55 ≤ 0.30 ≤ 0.55 ≤ 0.30
1 ≤ 0.65 ≤ 0.30 ≤ 0.60 ≤ 0.27 ≤ 0.60 ≤ 0.27
* DOE may revise these criteria as warranted by the ongoing energy savings analysis.

Mary Louise Pace, technical sales for Circle Redmont Inc., a skylight manufacturer in Melbourne, Fla., says she doesn't expect the skylight criteria to have a drastic effect.

"To follow the DOE guidelines, skylight companies will have to be a little more selective about the make-up of the glass in their products," she says. "The glass industry has an abundance of readily available brands of insulating and high-performance glass. In fact, most tinted and low-E insulated glass units meet the suggested U-values, so this shouldn't be too difficult to follow."

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