an aluminum grille installed between the two panes of this glass and wood windows
Illustration: Rodico Prato
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Muntin Choices: Grille in Glass

An aluminum grille sits permanently between two glass panes, hinting at the look of actual muntins. The metal conducts heat, raising its U-factor and making the window less efficient. Cleaning is a breeze, but choose a grille color you like, because there's no changing it.
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