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| Boston Sash Design Pressure & U-Value ratings |
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| Design Pressure or DP Rating Information | |
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| 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. |
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Independently Tested By:
National Certified Testing Laboratories
5 Leigh Drive
York, PA 17406 |
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Sash Thickness
| Profile Type
| Window type
| Spec Info
| DP Rating
| 1-3/8"
| SSB
| Double Hung
| Tilt Balance
| DP-30 | | 1-3/8" | SSB | Double Hung
| Concealed Balance
| DP-50 | | 1-3/4" | SSB | Double Hung
| Concealed Balance
| DP-40 | | 1-3/4" | IG
| Double Hung
| Concealed Balance
| DP-55 | | 1-5/8" | SSB/EP
| Awning | Gateway size
| DP-40
| | 1-5/8" | SSB/EP
| Awning
| 24"x36" Glass or smaller
| DP-50
| | 1-5/8" | SSB/EP
| Casement
| Gateway Size
| DP-35
| | 1-5/8" | SSB/EP
| Casement
| 10"x42" Glass or Smaller
| DP-50 |
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| U-Value Ratings | |
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 | Manufacturer stipulates that these ratings conform to applicable NFRC procedures for determining whole product performance. NFRC ratings are determined for a fixed set of environmental conditions and a specific product size. Consult manufacturers literature for other product performance information.
www.nfrc.org |
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Window Type
| Spec Info
| U-Factor Rating
| Solar Heat Gain Coefficient
| Visible Transmittance
| Double Hung
| Single Glazed w/Low E
| .41 | .44 | .48 | Double Hung
| Double Glaze - Wood Bead
Swiggle - Low E - 7/16
| .46 | .48 | .53 | Double Hung
| Single Strength w/ Low E Aluminum Storm
| .37 | .44 | .48 | Double Hung
| Single Strength w/ Aluminum Storm
| .48 | .51 | .52 |
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