Learn how Gentek 1900 Series double-hung new construction windows work, including two-sash ventilation, tilt-in cleaning, vent stops, frame options, glass packages, egress considerations, performance certification, installation planning, homeowner questions, and sales tips.

Article 57 of 100 | Double-Hung Window Product Guide

Gentek 1900 Series Double-Hung Windows: Features, Benefits, and Sales Guidance

Double-hung windows are often presented as the automatic upgrade from single-hung windows because both the upper and lower sashes operate. That additional operation can provide useful ventilation and cleaning flexibility, but it also introduces another sash, balance system, set of weatherstripping, and operating interface.

The Gentek 1900 Series double-hung window is designed for new construction and qualifying full-frame applications. Its value should be judged by how well its operation, frame, glass, performance, and installation details match the project—not by the word “double-hung” alone.

What Makes a Window Double-Hung?

A double-hung window has two vertically operating sashes. The lower sash moves upward, and the upper sash moves downward. In qualifying designs, both sashes can also tilt toward the interior for cleaning.

This differs from a single-hung window, where the lower sash is generally the primary operating sash and the upper sash remains fixed.

Contractors can review the complete collection through Suburban Wholesale & Supply’s Gentek 1900 Series new construction window page .

The first homeowner question

Will the homeowner actually operate the upper sash? If the answer is no, the additional double-hung functionality may provide little practical value in that opening.

Double-Hung Versus Single-Hung

Consideration	Double-hung	Single-hung
Operating sashes	Upper and lower sashes operate	Lower sash generally operates
Ventilation	Can admit air through lower, upper, or both openings	Ventilation primarily through the lower opening
Cleaning	Both sashes may tilt inward when designed and operated correctly	Confirm whether the lower sash tilts and how exterior upper glass is reached
Hardware	Requires operating and balancing components for both sashes	Fewer primary operating-sash components
Typical price	Often higher because of added operating features	Often more economical, subject to the exact configuration

Neither style is universally better. Double-hung operation is most valuable where upper ventilation and interior cleaning access will actually be used.

Sales tip

Demonstrate both styles instead of describing the double-hung as “premium.” Homeowners make better decisions when they can operate the upper sash and see whether the feature matters to them.

Two-Sash Ventilation

Opening both sashes can create low and high ventilation points. Under favorable conditions, cooler air may enter through a lower opening while warmer interior air exits through an upper opening.

This airflow pattern is not guaranteed. Actual ventilation depends on wind direction, indoor and outdoor temperature, pressure differences, sash position, screens, landscaping, neighboring buildings, and other openings in the home.

The upper sash can also be useful when the homeowner wants ventilation above the primary occupied zone. However, opening the upper sash does not make the window safe to leave unattended around children or pets.

Ventilation sales questions

Does the homeowner regularly open windows for ventilation?
Can the upper sash be reached comfortably?
Will curtains, blinds, furniture, or countertops interfere?
Are there children or pets in the room?
Does the home rely primarily on mechanical ventilation?
Will the window be installed above the first floor?

Tilt-In Cleaning Features

Double-hung windows can provide interior access to the exterior glass surfaces through tilt-in sash operation. This is especially helpful on upper stories where exterior ladder access would be difficult.

Gentek’s care guidance explains that the lower sash should be tilted first and supported during cleaning. The upper sash is then lowered and tilted after the lower sash has been positioned correctly. When returning the sashes to normal operation, the upper sash is reengaged before the lower sash.

Cleaning precautions

Unlock the window before attempting to move or tilt a sash.
Follow the current operating sequence for the exact product.
Support each sash with both hands while it is tilted.
Do not allow a sash to hang unsupported from its pivot or balance components.
Keep fingers clear of hinge, pivot, and meeting-rail pinch points.
Confirm that both tilt latches fully reengage with the frame.
Raise the upper sash completely before attempting to lock the window.

Do not oversell “easy cleaning”

Large sashes can be heavy. The feature reduces the need to reach the exterior glass from outside, but it still requires careful two-handed operation and physical control of the sash.

Fusion-Welded Vinyl and Nailing-Flange Construction

Gentek describes its 1900 Series hung windows with fusion-welded vinyl construction and an integral nailing flange. Fusion welding joins the vinyl frame and sash corners into integrated assemblies.

The nailing flange provides a new-construction attachment surface. It must be integrated with the sill pan, flashing, water-resistive barrier, cladding, and perimeter sealant according to the current installation requirements.

The flange is not a substitute for flashing, and exterior J-channel is not a substitute for the wall’s drainage plane. A properly manufactured window can still leak around its perimeter when installation details are incomplete or reversed.

Frame and Trim Options

Gentek illustrates the 1900 Series double-hung window with a nailing fin and optional 3-1/2-inch flat casing. Other qualifying frame and accessory choices may include integral J-channel and drywall-return details.

Nailing fin with flat casing

Flat casing can provide a defined exterior trim appearance while the nailing fin supplies the attachment surface behind it. Confirm casing width, projection, corner treatment, color, siding relationship, and current availability.

Integral J-channel

Integral J-channel can receive qualifying exterior siding edges and create a clean transition. The siding must retain its required movement and drainage clearances.

Drywall-return channels

Gentek describes 1/2-inch and 5/8-inch drywall-return channels for selected new construction details. Match the return to the actual drywall thickness, wall depth, and planned interior finish.

Ordering warning

“Standard frame” is not enough information. The quote should name the nailing fin, J-channel, casing, drywall return, jamb extension, color, and exterior-cladding relationship.

Vent Stops and Opening-Control Devices Are Different

Gentek identifies standard vent stops on its single- and double-hung new construction windows. A vent stop can limit sash travel at a selected position for convenient ventilation.

A vent stop should not automatically be described as a Window Opening Control Device. A qualifying WOCD is designed and tested for a specific opening-control function and release method.

Neither device turns an insect screen into a fall-prevention barrier. Screens are intended primarily for insect control.

Confirm before ordering

Whether the project requires a vent stop, WOCD, guard, or another control
Which sash the device controls
Required release operation
Window installation height
Emergency escape and rescue requirements
Local building-code requirements
Compatibility with the exact window size and configuration

Egress Must Be Verified by Exact Configuration

Gentek states that common egress sizes are available within its new construction hung-window collection. That statement does not make every Model 1900 double-hung window suitable for a bedroom or basement emergency escape opening.

The lower sash, meeting rail, sill, frame, stops, and hardware reduce the usable opening. Nominal size and visible-glass area do not establish the net clear opening.

Obtain current clear-opening dimensions for the exact size and configuration. Compare them with the locally adopted code, including minimum clear width, minimum clear height, minimum net clear area, and maximum sill height above the finished floor.

The label “egress size” is not the final answer

Confirm the exact manufactured unit, installation height, hardware, and local code. Similar nominal sizes can provide different clear openings across window styles and product generations.

Low-E Glass, Super Spacer, and Argon

Gentek identifies Low-E insulating glass, the Super Spacer structural foam spacer system, and optional argon gas as available energy-performance components for qualifying 1900 Series configurations.

These features work as part of an insulating-glass system:

Low-E glass manages radiant heat transfer and influences solar gain and visible light.
Super Spacer separates the glass panes and influences edge-of-glass thermal performance.
Argon gas can reduce heat transfer through the sealed insulating space.

The exact NFRC ratings depend on window size, glass package, grids, frame, and configuration. Do not use the rating from a fixed, single-hung, or casement window to represent a double-hung unit.

Gentek cautions that energy savings vary and depend on proper installation and use. It also notes that insulating-glass units requiring capillary tubes may experience some argon depletion.

Screens and Homeowner Safety

A screen allows ventilation while helping limit insect entry. It is not a guard, fall- prevention device, pet barrier, or security product.

A double-hung window can be opened at the top while the lower sash remains closed, but that configuration should not be presented as eliminating every fall or safety concern. Children can climb, sashes can be moved, and screens cannot support body weight.

Discuss required WOCDs, guards, vent stops, and other safety measures separately from insect screens.

Grid and Color Options

Gentek currently presents Colonial, Single Prairie, Single Prairie Perimeter, and Craftsman grid patterns within the 1900 Series. Published profiles include 5/8-inch flat, 3/4-inch contoured, and 1-inch contoured grids.

Double-hung grids require careful alignment across the upper sash, meeting rail, and lower sash. Verify the grid count in each sash instead of approving only the general pattern name.

Current interior colors include White, Beige, and Classic Clay. Gentek also publishes a broader exterior palette for qualifying products. Availability can vary by window style, base extrusion, configuration, and region.

Final color approval should be based on current physical samples. Digital displays cannot reproduce the exact gloss, texture, and undertone of a finished exterior coating.

Structural and Weather Performance

Gentek identifies high-performance model options intended for stringent local codes, including qualifying coastal-market applications. That statement must not be expanded into a claim that every 1900 Series double-hung window is coastal, impact, hurricane, or high-wind rated.

Performance depends on the exact size, glass, reinforcement, balance of frame and sash components, mull arrangement, anchoring, and installation. Larger windows may carry different ratings than smaller windows in the same series.

A performance-grade or design-pressure value should not be converted casually into a guaranteed wind speed. The required project pressure depends on building height, exposure, topography, wall location, opening size, and locally adopted code.

AAMA Gold Label Certification

The AAMA Gold Label Certification Program is administered by the Fenestration and Glazing Industry Alliance. The program includes product testing, manufacturing-site inspections, and continuing certification requirements for qualifying fenestration products.

When a project requires certified performance, compare the label with the exact double-hung product designation, tested size, performance class, performance grade, and referenced standard.

The label should be documented before it is concealed by trim. Do not use certification information from another window style or smaller configuration without proof that it applies.

A Gold Label certifies an identified manufactured product configuration. It does not certify the field installation or surrounding wall system.

InstallationMasters Principles for Double-Hung Windows

FGIA’s InstallationMasters program provides professional training and certification for installers of new construction and replacement windows and exterior glass doors. Training covers the process from site inspection through installation, final cleaning, and maintenance.

A double-hung window has two operating sashes that depend on accurate frame alignment. Bowing one jamb can affect sash travel, balance operation, tilt-latch engagement, weatherstripping contact, meeting-rail alignment, and locking.

Verify unit size, rough opening, frame option, and required clearances.
Check the sill for level and continuous support.
Confirm that jambs are plumb and the opening is reasonably square.
Install the required sill pan and flashing before setting the window.
Integrate the nailing flange with the water-resistive barrier.
Fasten and shim the frame without bowing the jambs.
Insulate the perimeter without distorting the frame.
Keep sill drainage openings clear.
Operate, tilt, close, and lock both sashes before installing final trim.
Demonstrate sash operation and cleaning to the homeowner.

InstallationMasters training supports professional installation practices, but Gentek’s current instructions, project specifications, engineering, and applicable codes remain controlling.

Contractor Ordering Checklist

☐ Confirm Gentek 1900 Series double-hung style.
☐ Verify unit size, rough opening, wall depth, and frame option.
☐ Confirm nailing fin, integral J-channel, flat casing, and drywall-return details.
☐ Verify exact clear-opening data when egress is required.
☐ Identify vent stops, WOCDs, accessible locks, or guards separately.
☐ Confirm current glass package and NFRC values.
☐ Determine whether safety glazing is required.
☐ Verify AAMA certification and required performance grade.
☐ Approve interior color, exterior color, grid pattern, grid profile, and hardware.
☐ Verify screen type, mesh, frame color, and coverage.
☐ Review current installation instructions and written warranty.

Compare Gentek Double-Hung Windows with Suburban Wholesale

Suburban Wholesale & Supply helps contractors, builders, remodelers, property professionals, and homeowners compare Gentek windows for projects throughout Davenport, Bettendorf, LeClaire, Eldridge, Moline, Rock Island, and the Quad Cities.

Bring plans, rough-opening dimensions, window schedules, wall sections, glass requirements, colors, grids, frame details, egress requirements, and performance criteria. The team can help identify missing information before the order is finalized.

Explore Gentek 1900 Series Windows Request a Product Demonstration Request a Window Quote

Sources and Technical References

Gentek Building Products — 1900 Series New Construction Windows
Suburban Wholesale & Supply — Gentek New Construction 1900 Series
Gentek Building Products — 1900 Series Window Size Guide
Gentek Building Products — Care and Operation Guide
Fenestration and Glazing Industry Alliance — AAMA Gold Label Certification Program
Fenestration and Glazing Industry Alliance — InstallationMasters Certification
Current Gentek product specifications, size charts, thermal and performance data, installation instructions, certified-product records, NFRC labels, warranties, and applicable building codes.

Technical note: The linked Gentek size guide is dated February 2018 and may not reflect current model numbers, dimensions, clear-opening data, hardware, glass packages, colors, ratings, or availability. Verify every configuration using current Gentek documentation. This article does not replace manufacturer instructions, code review, engineering, or project-specific egress and safety calculations.

Gentek 1900 Series Double-Hung Windows: Contractor Guide