Aluminum Project-In Windows
Boyd Aluminum manufactures commercial aluminum project-in windows, also called projected-in or inward-opening projection windows, for schools, universities, hospitals, government offices, military structures, historic-replica work, coastal applications, and other commercial building projects. Project-in windows open toward the interior side of the building, so the right series depends on operation type, frame depth, thermal requirements, AAMA rating, glazing, hardware, screens, interior clearance, and project-specific documentation.
Contemporary building designs often call for projection windows with modern sightlines, project-in functionality, published performance ratings, and glazing or hardware options that fit the application. A Direct Assistance™ representative can help project teams review the correct project-in window series for the building use, design intent, opening condition, and bid documents.
Project-In Aluminum Window Series
Boyd project-in windows include thermal-strut 3250XT configurations, historic-replica configurations, the 4300 project-in system, and standard or narrow-sightline 2300 project-in systems. Use the table below as a starting point, then confirm the selected series against current product data, drawings, glazing, opening conditions, and specification requirements.
Boyd commercial aluminum project-in window series
| Series | Project-In Window Details |
|---|---|
| Series 3250XTP-G (PI) | Historic-replica project-in thermal-strut projection window; 39mm thermal strut; 3.25" frame depth; AW-PG80 AAMA rating; maximum 1.75" glazing; exterior snap-in muntins; tank sill. |
| Series 3250XTP (PI) | Project-in thermal-strut projection window; 39mm thermal strut; 3.25" frame depth; AW-PG80 AAMA rating; maximum 1.75" glazing; interior-glazed design; tank sill. |
| Series 4300 (PI) | Project-in commercial aluminum window; 4" frame depth; AW-PG100 AAMA rating; inside- or outside-set glazing up to 1.5"; thermal barrier; true, interior, and historical muntin options; positioned for demanding coastal-weather applications. |
| Series 2300 (PI) | Project-in commercial aluminum window; thermal-break design; 2.375" frame depth; AW-PG100 AAMA rating; maximum 1.5" glazing; true, interior, and historical muntin options; standard 2300 configuration with a separate 2300 (NSL) narrow-sightline option. |
| Series 2300 (NSL) (PI) | Narrow-sightline project-in commercial aluminum window; thermal barrier; 2.375" frame depth; AW-PG80 AAMA rating; maximum 1.5" glazing; true, interior, and historical muntin options; use this product data when narrow sightlines are required. |
Project-In vs Project-Out Commercial Windows
A project-in window opens inward toward the building interior. A project-out window opens outward toward the exterior. That direction of operation affects hardware, screens, interior clearance, exterior obstructions, water management, user access, and code review.
Use project-in windows when inward operation supports the opening condition, user access, maintenance approach, or architectural intent.
Use project-out windows when outward projection is the better fit for the building design, interior clearance, hardware, screen, or ventilation strategy.
Do not choose only by swing direction. Match the series to AAMA rating, frame depth, glazing, sightline, thermal requirements, historic-review needs, interior clearance, and project documentation.
Project-In Projection Windows vs Project-In Casement Windows
Boyd project-in configurations include projection-window and casement-window options. The distinction matters because operation style, sash geometry, hardware, ventilation, cleaning access, and rating documentation can differ even when both products open inward.
Project-in projection windows include Boyd 3250XTP and 3250XTP-G configurations and are generally reviewed when the specification calls for projected operation.
Project-in casement windows include Boyd 3250XTC and 3250XTC-G configurations and are generally reviewed when the specification calls for casement operation with inward swing.
Confirm terminology early. Drawings, schedules, and specifications may use PI, projected-in, project-in, projection, or casement language differently, so the intended operation should be clarified before quoting.
Commercial Project-In Window Selection Factors
How to narrow the Boyd project-in window series
| Selection Factor | Why It Matters |
|---|---|
| Operation direction | Project-in windows open inward, so interior clearance, occupant use, hardware reach, screens, and cleaning access should be reviewed before selecting a series. |
| Projection vs casement terminology | Clarify whether the schedule calls for a projected-in window, a project-in casement, a narrow-sightline option, or a specific Boyd series such as 3250XTP, 3250XTC, 4300, 2300, or 2300 (NSL). |
| Thermal performance | Thermal-strut and thermally broken project-in systems should be matched to the required U-value, CRF, glazing, frame depth, and energy-code documentation for the selected product. |
| Performance class and rating | Published AAMA ratings vary by series. Confirm rating requirements against the specification and current product documentation for the selected system. |
| Glazing and frame depth | Project-in series include 3.25", 4", and 2.375" frame depths, with maximum glazing thickness varying by series. Existing openings, panning, receptors, and wall conditions should be reviewed. |
| Historic appearance | Historic-replica and historic-review projects may require muntin, sightline, profile, finish, panning, and opening-condition review by the project authority. |
| Narrow sightlines | If narrow sightlines are required, use the specific 2300 (NSL) product data instead of assuming the standard 2300 rating and details apply. |
| Coastal-weather review | For coastal-weather applications, match the selected series to the required AAMA rating, glazing, frame depth, installation conditions, and available product documentation. |
| Code and egress review | For code-driven openings, confirm operating clearances, net clear opening, sill height, fall protection, window opening-control-device requirements, restrictors where applicable, and authority-having-jurisdiction requirements. |
When Project-In Windows Make Sense
Schools, universities, hospitals, government offices, military structures, and institutional buildings where inward operation fits the user and maintenance approach.
Commercial projects that need operable ventilation while keeping the exterior condition, surrounding construction, or architectural expression coordinated.
Thermal-window projects where 3250XT thermal-strut project-in configurations are being reviewed for energy-related requirements.
Historic-replica or historic-review projects where inward operation, muntins, profiles, finish, and existing opening conditions need project-specific coordination.
Projects where narrow sightlines are requested and the 2300 (NSL) product data should be reviewed separately from the standard configuration.
Coastal-weather projects where published AAMA ratings, glazing, frame depth, and project requirements need to be matched to the selected series.
Common Project-In Window Coordination Issues
Interior clearance: Project-in windows open inward, so furniture, blinds, shades, security screens, interior trim, hardware reach, and occupant use should be reviewed.
Projection vs casement operation: Confirm whether the documents require a projected-in window, a project-in casement, or a specific Boyd series before pricing or submittal preparation.
Screens and access: Screen location, cleaning access, custodial control, and hardware operation should be coordinated with the inward-opening sash.
Opening size and frame depth: Series depth and glazing capacity vary across the project-in family. Existing openings, receptors, panning, surrounding substrates, and finish conditions should be reviewed early.
Narrow-sightline requirements: If the drawings or design intent call for narrow sightlines, confirm whether the project should be reviewed under the 2300 (NSL) product data.
Historic review: Historic or landmark projects may require muntin, profile, sightline, finish, and detail review by the project authority. Do not assume one historic application establishes approval for another project.
Coastal-weather requirements: Coastal projects should be reviewed against the exact series, configuration, glazing, installation conditions, pressure requirements, and available product documentation.
Egress and code-driven openings: Egress, fall protection, window opening-control-device requirements, and ventilation requirements are project-specific. Confirm the adopted code and authority-having-jurisdiction requirements for each opening.
What to Send Boyd for Project-In Window Review
Send as much project information as possible so Boyd can review the project-in window series, operation type, and documentation needs without guessing.
Project name, location, building type, bid deadline, and desired review timeline.
Drawings, elevations, window schedule, specifications, and opening details.
Whether the specification calls for PI, project-in, projected-in, projection, casement, narrow sightlines, or a specific Boyd series.
Desired Boyd series, if already specified, or the required AAMA class / PG rating.
Opening sizes, rough openings, existing conditions, interior clearance, sill heights, and egress or net clear opening requirements where applicable.
Glazing requirements, glass thickness, thermal targets, U-value needs, CRF needs, and any acoustic or security requirements.
Screen, hardware, custodial access, window opening-control-device requirements where applicable, restrictor, cleaning, and maintenance requirements.
Historic appearance requirements, muntin patterns, finish requirements, sample needs, and review-authority comments if available.
Coastal-weather, forced-entry, or other project-specific performance documentation requirements.
Installation conditions, substrates, panning, receptors, anchors, surrounding wall conditions, and field constraints.
Related Boyd Resources
Project-Out Windows - compare outward-opening projection window options.
3250XT Thermal-Strut Window Line - review thermal-strut project-in, project-out, casement, and fixed configurations.
Historic Replication - review historic-replica and steel-replica aluminum window options.
Finish Options - review standard and custom commercial aluminum finish options.
Architectural Resources - access product data, specifications, and detail resources.
Commercial Aluminum Project-In Window FAQ
What is a project-in window?
A project-in window is an operable window that opens inward toward the interior side of the building. In commercial aluminum window specifications, the same concept may be described as project-in, projected-in, inward-opening, or PI. Project-in operation affects interior clearance, hardware, screens, cleaning access, ventilation, code review, and product selection, so the opening direction should be confirmed before bidding or submittals.
How much interior clearance do project-in windows need?
Because a project-in window opens inward, the operating sash swings toward the room. Interior clearance should be coordinated with furniture, blinds and shades, interior trim, security screens, custodial access, hardware reach, and occupant use. The needed clearance depends on sash size, opening geometry, hardware, and the selected Boyd series. Review the swing path against the actual interior layout before selecting a project-in system, especially in classrooms, patient rooms, offices, and other occupied spaces.
What is the difference between project-in projection windows and project-in casement windows?
Both can open inward, but they are not the same product configuration. A project-in projection window is reviewed as a projected-window configuration, while a project-in casement window is reviewed as a casement-window configuration with inward operation. On Boyd project-in work, this distinction affects the series family, AAMA rating, sash geometry, hardware, sightline, and product documentation, so PI terminology should be matched to the actual series and drawings.
Are commercial project-in windows thermally broken?
Current published Boyd product data lists either thermal-strut construction or a thermal barrier for the project-in series on this page, but the exact thermal design depends on the selected product. The 3250XT project-in configurations use a 39mm thermal strut, while the 4300, 2300, and 2300 (NSL) project-in pages list a thermal barrier. For broader thermal-system selection, review Boyd's XT thermal product line and confirm U-value, CRF, glazing, and energy-code documentation for the exact configuration.
Can project-in windows be used for coastal or historic projects?
Sometimes, but those requirements are series- and configuration-specific. Selected Boyd project-in windows support historic-replica or historic-review applications, while other project-in series are positioned for coastal-weather performance. Confirm the exact series, glazing, size, pressure, installation method, documentation path, and reviewing authority before specifying or bidding.