Walk-in Cooler and Freezer Windows Called Out In Energy Independence Act of 2007

Windows get specific mention in the Energy Independence Act of 2007.  Design changes are required in windows to meet energy efficiency needs. The Act states these changes for both reach-in doors and wall windows:

(3) ADDITIONAL SPECIFICATIONS. “Each walk-in cooler or
walk-in freezer with transparent reach-in doors manufactured
on or after January 1, 2009, shall also meet the following
specifications:

“(A) Transparent reach-in doors for walk-in freezers
and windows in walk-in freezer doors shall be of triple pane
glass with either heat-reflective treated glass or gas
fill.

“(B) Transparent reach-in doors for walk-in coolers
and windows in walk-in cooler doors shall be:

(i) double-pane glass with heat-reflective treated glass and gas fill; or (ii) triple-pane glass with either heat-reflective treated glass or gas fill.”

Let’s look at the options available to meet these requirements.

Reach-in doors are used for quick access to commonly used items in a kitchen or serving area. Windows help users keep track of availability and use of these consumables, which keeps a foodservice area moving smoothly.

Entrance doors are covered with the same Act statements. These doors typically contain windows as a safety and security measure; workers can avoid opening a door into someone on the opposite side and managers can keep an eye on product without opening the doors.

The Act requirements for windows help alleviate the heat leaks caused when a window is poorly designed or mounted.  For freezers, there is no leeway in the number of panes used in a window, triple-paned windows are now the standard. Double-paned windows are still usable in walk-in coolers.

Windows mounted in doors should properly seal against the exterior and interior door surfaces. A properly designed window is adjustable to meet small variations in door thickness. Additionally, windows can be ordered without frame ledges, which enhances cleaning efficiency and avoids holding condensation.

Heating is important on freezer windows, and windows located in high humidity areas, to ensure the view is clear for safety reasons.  Frequently only the fame is heated, but windows are available with both frame and glass heating, which ensures that the view remains open.

One item not specified by the Act is the importance of the frames themselves having proper thermal barriers. Being metal, the frames can conduct heat much more quickly than the glass panes, which results in a quick loss of thermal efficiency. Frames should be built with thermal barriers to avoid unnecessary heat conduction into the cooler or freezer.

R-Plus Doors will keep you informed on how we can help you address these required changes.