Boston Sash Design Pressure & U-Value ratings Design Pressure or DP Rating Information This Product has been tested using ASTM E 330-02 Test Method for Structural Integrity. Maximum Wind Load expressed as Design Pressure Rating in PSF. Independently Tested By:National Certified Testing Laborator...

Mill Fenestration"Helping Revitalize Historic Mills" Historic Preservation Boston Sash has always been deeply committed to Historic Preservation. The Company was formed to make replacement sash originally fabricated by the old New England Yankee Craftsmen. The Mill revitalization movement is very ex...

Boston Sash typically offers 5 types of window products or profiles available on the following types of windows: Double Hung, Awning, Picture and Transom. (Click on drawings for additional details) Double Hung Single Glaze True Divided Lite 5/8" Muntin Vinyl Jam Liner Double Hung Single Glaze True D...