Series 850 Commercial Double-Hung Windows

Boyd's Series 850 is a thermally broken, heavy-commercial aluminum double-hung window designed for demanding conditions. With both the upper and lower sash operating, the Series 850 provides flexible ventilation and traditional double-hung appearance for schools, hospitals, monumental buildings, and other commercial or institutional applications. Architectural configurations are available when the project calls for a specific visual or replacement condition.

Excellent for historic double-hung window replacement projects, the Series 850 features a 4" main frame, double-weatherstripped sash construction, custodial-key-operated tilt mechanisms, and heavy-duty spiral or Ultra-Lift balances. Upper and lower sash tilt inward for convenient interior cleaning, while continuous wraparound marine glazing accommodates insulated glass up to 1" thick. True divided-lite, interior, and applied muntin options, screens, hospital-sill configurations, coordinated perimeter accessories, finish selections, and project-specific customization support unique renovation and new-construction requirements.

Series 850 Product Details

Key commercial double-hung window attributes for product review:

Series 850 Product Data and Downloads

Use the current Boyd resource links below for Series 850 detail drawings, guide specifications, accessories, historic-window resources, gallery images, and finish options.

When to Use the Series 850 Double-Hung Window

• Heavy-commercial openings requiring a thermally broken aluminum double-hung window for demanding conditions.

• Schools, hospitals, monumental buildings, institutional facilities, and other commercial applications.

• Architectural or historic double-hung replacement projects requiring traditional appearance and both upper and lower sash operation.

• Projects requiring H-HC40 performance, a 4" thermal-break frame, 12.11 psf water resistance, and marine glazing up to 1" thick.

• Openings requiring custodial-key-controlled tilt access, heavy-duty balances, interior cleaning, tamper-resistant operation, and exterior-mounted screens.

• Hospital or institutional openings that benefit from a hospital-sill option, true or simulated muntins, perimeter accessories, finish options, and customization.

Choosing a Boyd Double-Hung, Single-Hung, or Fixed Window

You are viewing the Series 850 H-HC40 heavy-commercial double-hung window. Review the related Boyd systems below when the project requires higher double-hung performance, coastal or historic-replica positioning, impact or blast capability, single-hung operation, historical muntins, internal blinds, or matching fixed openings.

Series 850 Double-Hung Window Advantages

• Heavy-commercial, thermally broken double-hung system designed for demanding conditions.

• Architectural configurations and historic double-hung replacement options for monumental, institutional, renovation, and preservation projects.

• H-HC40 performance with 12.11 psf water resistance and 60.15 psf structural performance.

• A 4" thermal-break frame and continuous perimeter marine glazing accommodate insulated glass up to 1" thick.

• Both upper and lower sash operate for flexible ventilation and traditional double-hung appearance.

• Upper and lower sash tilt inward for controlled interior cleaning without deglazing.

• Tamper-resistant, custodial-key-operated tilt mechanisms support institutional maintenance and security procedures.

• Heavy-duty spiral or Ultra-Lift Class 5 balances support dependable sash operation.

• True divided-lite, interior roll-form, and applied simulated muntin options support contemporary, traditional, and historic replacement elevations.

• Hospital-sill configurations, screens, panning, receptors, subsills, mullions, trims, nailing fins, leg extenders, finishes, and customization options expand project flexibility.

Common Series 850 Coordination Items

• Double-hung operation: Confirm that both upper and lower sash operate, along with lift and pull-down-handle locations, sash travel, operating force, balance selection, user access, and ventilation requirements.

• Architectural and historic replacement requirements: Coordinate existing-window profiles, sightlines, sash proportions, meeting-rail location, muntin pattern, finish, perimeter conditions, and reviewing-authority comments. Historical muntins are not listed as a standard Series 850 option.

• Custodial tilt access: Coordinate key control, authorized-user access, interior cleaning clearances, furnishings, shades, security, and maintenance procedures.

• Hospital sill: Confirm whether the project requires the limited-opening hospital-sill configuration, intended ventilation across the meeting rails, operating restrictions, and institutional safety requirements.

• Egress and clear opening: Where emergency escape or rescue requirements apply, provide the required net clear opening, minimum clear dimensions, sill height, unit size, and authority-having-jurisdiction comments.

• Glazing and muntins: Confirm insulated-glass makeup, overall thickness, safety glazing, marine-glazing compatibility, true divided-lite or simulated muntin construction, grid pattern, finish, coatings, spacers, and replacement access.

• Sash cleaning and screens: Preserve interior clearance for upper- and lower-sash tilt-in cleaning, balance and lock service, screen removal, and glazing replacement.

• Openings and accessories: Verify field dimensions, rough openings, substrates, anchors, panning, receptors, subsills, mullions, trims, nailing fins, leg extenders, sealants, drainage, and surrounding construction before release.

What to Send Boyd for a Series 850 Review

Send as much of the following project information as available:

• Project name, location, building type, bid date, construction schedule, architectural drawings, elevations, window schedules, specifications, and opening sizes.

• Architectural or historic replacement requirements, existing-window photographs or profiles, sash proportions, sightlines, meeting-rail location, muntin pattern, finish, and reviewing-authority comments.

• Required double-hung operation, upper- and lower-sash sizes, sash travel, lift and pull-down-handle locations, custodial-key control, hospital-sill option, screens, and maintenance-access requirements.

• Any egress or emergency-escape requirements, net clear opening targets, minimum clear dimensions, sill-height limits, and authority-having-jurisdiction comments.

• Glazing makeup, overall thickness, coatings, spacers, safety glazing, marine-glazing requirements, true or simulated muntin pattern, and finish.

• Required H-HC40, air, water, structural, thermal, forced-entry, security, and jurisdictional criteria.

• Panning, receptor, subsill, mullion, trim, nailing-fin, leg-extender, anchor, sealant, drainage, substrate, installation, and submittal requirements.

Related Hung, Historic-Replacement, and Project Resources

• Commercial aluminum single-hung and double-hung windows for broader hung-window comparison and selection guidance.

• Historic-replica and historic-window-replacement resources for sightline, profile, muntin, sash proportion, finish, and reviewing-authority coordination.

• Commercial aluminum fixed windows for coordinated non-operable openings and matching elevations.

• Commercial window hardware and accessories for screens, panning, receptors, subsills, mullions, trims, nailing fins, and related coordination.

• Commercial aluminum finish options for standard and custom anodized or painted finish review.

• Architectural resources, CAD details, specifications, and product support for project documentation.