Hello, these windows are not storm windows they are a robust steel interior with an aluminum clad exterior. This product offers optimal energy efficiency with U-values as low at .16. The custom engineered, fully welded frames can support various glazing options as well as large expanse glass. Please contact us directly if you have any further questions - 810-798-2817.
Grabill Windows & Doors
Davison AgencyАвтор
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