3250XT Thermal Strut Commercial Aluminum Windows
New energy-code requirements are driving demand for high-performance commercial aluminum windows. At Boyd Aluminum, we manufacture the Series 3250XT thermal strut commercial aluminum window line to deliver U-Factors as low as 0.34, a 3.25" frame depth, and a 39mm polyamide thermal strut for architects, contractors, glaziers, and project teams.
With a 39mm extra-wide polyamide crimped-in-place structural thermal barrier, the 3250XT system helps thermally separate the exterior and interior aluminum framing, reducing conductive heat transfer and supporting energy-efficient commercial building design.
The 3250XT line includes fixed, project-out, project-in, casement, and "-G" historic-replica configurations with interior glazing, snap-in glazing beads, 1" and 1.75" glazing options, and blast-resistance capabilities.
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3250XT Thermal Strut Window Series
The 3250XT line offers multiple fixed, projected, casement, and historic-replica options. Final selection should match the project drawings, operation type, glazing, performance requirements, historic-replica requirements, opening conditions, and specifications.
3250XT thermal strut commercial aluminum window configurations.
| System | Common Use & Selection Notes |
|---|---|
| Series 3250XTP (PO) | Operation: Project-out projected window. System depth: 3.25" frame depth. Maximum glazing: 1.75". Common use: Commercial openings requiring outward projection, interior glazing, snap-in glazing beads, and coordination with panning, receptors, mullions, and trim. |
| Series 3250XTP (PI) | Operation: Project-in projected window. System depth: 3.25" frame depth. Maximum glazing: 1.75". Common use: Commercial openings requiring inward projection, interior access, and glazing coordination. |
| Series 3250XTC (PO) | Operation: Project-out casement window. System depth: 3.25" frame depth. Maximum glazing: 1.75". Common use: Commercial casement openings requiring side-hinged project-out operation and hardware coordination. |
| Series 3250XTC (PI) | Operation: Project-in casement window. System depth: 3.25" frame depth. Maximum glazing: 1.75". Common use: Commercial openings requiring inward casement operation and interior access. |
| Series 3250XTF | Operation: Fixed window. System depth: 3.25" frame depth. Maximum glazing: 1.75". Common use: Non-operable openings needing superior thermal performance and visual coordination with operable 3250XT units. |
| Series 3250XTP-G (PO) | Operation: Historic-replica project-out projected window. System depth: 3.25" frame depth. Maximum glazing: 1.75". Common use: Historic-replica openings requiring project-out operation and exterior snap-in muntin coordination. |
| Series 3250XTP-G (PI) | Operation: Historic-replica project-in projected window. System depth: 3.25" frame depth. Maximum glazing: 1.75". Common use: Historic-replica openings requiring inward projection and muntin coordination. |
| Series 3250XTC-G (PO) | Operation: Historic-replica project-out casement window. System depth: 3.25" frame depth. Maximum glazing: 1.75". Common use: Historic-replica casement openings requiring project-out operation and muntin coordination. |
| Series 3250XTC-G (PI) | Operation: Historic-replica project-in casement window. System depth: 3.25" frame depth. Maximum glazing: 1.75". Common use: Historic-replica casement openings requiring inward operation and muntin coordination. |
| Series 3250XTF-G | Operation: Historic-replica fixed window. System depth: 3.25" frame depth. Maximum glazing: 1.75". Common use: Non-operable historic-replica openings needing thermal performance and visual coordination. |
3250XT Product Sheet
Download the 3250XT product sheet for detailed specifications, U-Factors, AAMA ratings, and performance data.
Why Architects and Contractors Choose 3250XT
U-Factors as low as 0.34: Published product-sheet values include 0.34 for the standard fixed configuration and 0.43 for standard projected and casement configurations based on 0.24 COG glass per NFRC 100.
39mm thermal strut: Extra-wide polyamide barrier helps reduce frame heat transfer.
3.25" commercial frame: Supports 1" and 1.75" glazing with strong detailing.
Multiple configurations: Fixed, projected, casement, and historic-replica options help maintain visual consistency across varied opening types.
Clean appearance: Flush vent appearance when closed for a sleek commercial look.
Project support: Drawings, schedules, glazing, operation type, accessory requirements, and bid needs can be reviewed with the Direct Assistance™ team.
3250XT Thermal Strut Window Quick Specs
Thermal barrier: 39mm extra-wide polyamide crimped-in-place structural thermal barrier.
System depth: 3.25" frame depth.
Glazing: 1" and 1.75"; maximum listed glazing is 1.75".
Configurations: Fixed, project-out, project-in, casement, and "-G" historic-replica.
Published U-Factor data: 0.43 for standard projected and casement configurations; 0.34 for the standard fixed configuration.
AAMA ratings: AW-PG80 for standard projected configurations; AW-PG100 for standard casement and fixed configurations.
Project-specific note: Ratings vary based on glass selection, spacer selection, opening conditions, and project requirements.
How 3250XT Thermal Strut Windows Compare to Non-Thermally Broken Aluminum
Thermal strut windows use a polyamide structural barrier to separate the exterior and interior aluminum framing. This can help support lower U-Factors, reduced condensation potential, occupant comfort, and improved energy performance compared to non-thermally broken aluminum framing.
3250XT Case Study
Read the related 3250XT case study on how the line supports energy-conscious commercial projects and the 2030 Challenge.
3250XT System Advantages
39mm polyamide thermal barrier for extremely low listed U-Values.
3.25" frame depth.
Interior glazed with snap-in glazing beads.
0.125" structural wall areas.
Blast-resistance capabilities.
1" and 1.75" glazing options.
Flush vent appearance when closed.
Exterior snap-in muntins available on "-G" configurations.
Panning, receptor systems, caulk backers, mullions, snap trims, and screens available.
Two rows of weather stripping and pressure equalization.
Performance Level 10 forced-entry requirements.
3250XT Performance Data
Performance values below are from the 3250XT product sheet and are based on 0.24 COG glass per NFRC 100. Job-specific results vary based on glass selection, glass spacer selection, opening conditions, and project requirements.
Historic-replica note: Exterior snap-in muntins are available with the "-G" option. The performance table below reflects the standard 3250XT product-sheet rows; project-specific performance for historic-replica configurations should be confirmed when required.
3250XT product-sheet performance data.
| Configuration | Listed Product Data |
|---|---|
| 3250XTP (PO) | Product type: Awning / project-out. System depth: 3.25". U-Factor: 0.43. AAMA rating: AW-PG80. Air infiltration: 0.06 @ 6.2 psf. Water resistance: 15 psf. Structural performance: 120 psf. Maximum glazing: 1.75". |
| 3250XTP (PI) | Product type: Awning / project-in. System depth: 3.25". U-Factor: 0.43. AAMA rating: AW-PG80. Air infiltration: 0.06 @ 6.2 psf. Water resistance: 15 psf. Structural performance: 120 psf. Maximum glazing: 1.75". |
| 3250XTC (PO) | Product type: Casement / project-out. System depth: 3.25". U-Factor: 0.43. AAMA rating: AW-PG100. Air infiltration: 0.06 @ 6.2 psf. Water resistance: 15 psf. Structural performance: 150 psf. Maximum glazing: 1.75". |
| 3250XTC (PI) | Product type: Casement / project-in. System depth: 3.25". U-Factor: 0.43. AAMA rating: AW-PG100. Air infiltration: 0.06 @ 6.2 psf. Water resistance: 15 psf. Structural performance: 150 psf. Maximum glazing: 1.75". |
| 3250XTF | Product type: Fixed. System depth: 3.25". U-Factor: 0.34. AAMA rating: AW-PG100. Air infiltration: 0.05 @ 6.2 psf. Water resistance: 15 psf. Structural performance: 150 psf. Maximum glazing: 1.75". |
Historic-Replica 3250XT-G Options
The "-G" configurations provide historic-replica appearance with exterior snap-in muntins while supporting modern thermal-strut window design. Project-specific performance for historic-replica configurations should be confirmed when required.
3250XT Project Support
Send the project details, drawings, schedules, operation type, glazing requirements, and accessory needs. The Direct Assistance™ team can help with configurations, specifications, details, and bidding.
Get a 3250XT Bid Spec the 3250XT on Your Project
3250XT Thermal Strut Window FAQ
What is the 3250XT window line?
The 3250XT is our 3.25" thermal strut commercial aluminum window system offering fixed, projected, casement, and historic-replica configurations with a 39mm polyamide thermal barrier.
What U-Factor performance does the 3250XT line deliver?
The 3250XT product sheet lists U-Factors of 0.34 for the standard fixed configuration and 0.43 for standard projected and casement configurations based on 0.24 COG glass per NFRC 100. Job-specific results vary based on glass selection, spacer selection, opening conditions, and project requirements.
How do thermal strut windows like the 3250XT compare to standard aluminum windows?
Thermal strut windows incorporate a polyamide structural barrier that separates the exterior and interior aluminum frame. This helps reduce heat transfer through the frame compared to non-thermally broken aluminum framing.
Which configurations are available in the 3250XT line?
The line includes 3250XTP projected windows, 3250XTC casement windows, 3250XTF fixed windows, and historic-replica "-G" versions. Project-out and project-in options are available for projected and casement configurations.
Are historic-replica options available?
Yes. The "-G" configurations provide historic-replica appearance with exterior snap-in muntin coordination. Project-specific performance for historic-replica configurations should be confirmed when required.
What types of projects use 3250XT windows?
3250XT windows are commonly reviewed for medical facilities, schools, office buildings, commercial replacement, restoration, adaptive reuse, and historic-replica projects where the selected configuration, glazing, opening conditions, thermal requirements, and specifications align with the project.
Does the 3250XT line include blast-resistance capabilities?
Yes. Blast-resistance capabilities are available. Requirements are project-specific and should be evaluated with the selected configuration, glazing, opening conditions, specifications, and required documentation.
Is there a 3250XT case study?
Yes. The 3250XT case study discusses how the thermal strut window line supports energy-conscious commercial projects and the 2030 Challenge.
How do I move forward with 3250XT windows for a project?
Send us the project name, location, drawings, window schedule, operation type, glazing requirements, and accessory needs. Our Direct Assistance™ team will review the details and help provide a bid.