Large-Opening Thermal Break Single & Double Hung Window

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Upper or lower fixed-glass combinations are available

Single-hung or double-hung vertical sash movement

A Larger Thermal Break Hung Window for Taller Residential Openings

This large-opening aluminum hung window supports wider and taller sash sizes for apartments, townhouses, multi-family housing, and custom residential projects.

A 1.8mm aluminum profile, 128mm system depth, 24mm thermal break, Caldwell balancing hardware, and fixed screen options support single-hung, double-hung, and fixed-and-hung combinations.

1.8mm Aluminum Profile

128mm System Depth

24mm Thermal Break

350–1200 × 600–3000mm Sash Size Range

40kg Maximum Sash Capacity

Why Builders Choose This Large-Opening Hung Window

The system is intended for projects that need larger sash dimensions, a thermal break frame, and more fixed-and-operable layout choices.

Wider and Taller Sash Range

The sash range extends to 1200mm wide and 3000mm high, giving project teams more flexibility for taller openings.

128mm Thermal Break System

The published system dimensions include a 128mm depth and 24mm thermal break for improved frame separation.

Caldwell Balancing Hardware

American Caldwell hardware is supplied in black or white and supports a maximum sash capacity of 40kg.

Fixed-and-Hung Combinations

Available layouts include top fixed with lower hung, upper hung with lower fixed, double hung, and side-by-side fixed combinations.

Large-Opening Single and Double Hung Window Operation

The hung window section starts at approximately 15 seconds and shows the vertical sash movement used by this product type.

Configured for Larger Residential and Apartment Openings

Send the window schedule, rough opening sizes, quantity, glass, strip arrangement, screen choice, and installation detail for review.

Product Configuration

Window typeSingle-hung or double-hung aluminum window.

Profile thickness1.8mm.

Standard hardwareCaldwell balancing hardware in black or white.

Sash size350–1200mm wide × 600–3000mm high.

Maximum sash capacity40kg.

Standard glass5mm + 12A + 5mm insulated glass.

Strip arrangementThe V2 specification lists interior, center, or exterior strip placement with the 5mm + 12A + 5mm IGU.

ScreenFixed stainless steel mesh or fiberglass mesh.

InstallationNail fin or mounting tabs.

Available layoutsTop fixed with lower hung, upper hung with lower fixed, double hung, and side-by-side fixed combinations.

System dimensions128mm system depth; 55mm vertical frame; 55.1mm top frame; 24mm thermal break; 43.5mm bottom frame; 40.3mm meeting rail.

Estimated Performance References

≥0.48Estimated U-Factor
BTU/(h·ft²·°F)

300PaEstimated Water Resistance

0.3 L/s·m²Estimated Air Leakage

≤3000PaEstimated Wind Pressure Resistance

30dBEstimated Sound Insulation

1.8mmAluminum Profile

All performance figures are estimated values from the latest AMJ product specification V2 dated July 23, 2026. Final results depend on window size, glass, configuration, installation, and the applicable project test report.

Top Fixed + Lower Hung

Fixed glass above with a vertically operating lower sash.

Upper Hung + Lower Fixed

Vertically operating upper sash above a fixed lower panel.

Double Hung

Upper and lower sashes can move vertically.

Side-by-Side Combination

Hung windows can be combined with adjacent fixed units.

Our Strength

Production Process Project Services Certificates

1. Checking & Alignment

2. Cutting & Punching

3. Milling Holes

4. Assembly

5. Glass Assembly

6. Packaging

7. Delivery

8. Installation

Drawing & Engineering Review

Sample Support

Quality Inspection

U.S. Showrooms

48-Hour On-Site Support

Warranty Service

NFRC

CSA

ENERGY STAR

ISO

Key Differences Between the Two Hung Window Systems

Only the specifications that differ are shown below. The current product is the Large-Opening Thermal Break Double Hung Window.

Comparison	Standard Aluminum Double Hung Window	Large-Opening Thermal Break Double Hung Window CURRENT
Profile Thickness	1.6mm	1.8mm
Sash Width	350–1000mm	350–1200mm
Sash Height	600–2200mm	600–3000mm
Sash Capacity	25kg standard / 40kg heavy-duty balancer	40kg
Estimated U-Factor	≥0.52 BTU/(h·ft²·°F)	≥0.48 BTU/(h·ft²·°F)
Installation	Nail fin / mounting tabs / screws	Nail fin / mounting tabs
Available Layouts	Single-hung / double-hung / side-by-side fixed combination	Top fixed + lower hung / upper hung + lower fixed / double-hung / side-by-side fixed combination
Published System Dimensions	Not listed in the current V2 specification	128mm depth; 55mm vertical frame; 55.1mm top frame; 24mm thermal break; 43.5mm bottom frame; 40.3mm meeting rail

Frequently Asked Questions

What are the main advantages of this large-opening hung window?

It supports sash sizes up to 1200mm wide and 3000mm high, uses a 1.8mm profile and 24mm thermal break, and offers more fixed-and-hung layout options.

Can it be ordered as single hung or double hung?

Yes. The system supports single-hung and double-hung configurations, subject to the final window schedule and sash calculation.

Which fixed-and-hung combinations are available?

The V2 specification lists top fixed with lower hung, upper hung with lower fixed, double hung, and side-by-side fixed combinations.

What is the maximum sash capacity?

The listed maximum sash capacity is 40kg. Final approval depends on sash size and glass weight.

What information should I send for a quotation?

Send the project location, rough opening sizes or window schedule, quantity, layout, color, glass, screen, installation detail, and delivery ZIP code to info@amjbm.com.

What is the minimum order quantity?

We offer flexible MOQs. Sample sets can be reviewed before bulk production, and tiered pricing is available for full container load project orders.

Start Your Large-Opening Hung Window Project

Send your drawings, window schedule, rough opening sizes, or BOQ for sash sizing, layout review, screen options, and project pricing.

Request a Project Quote Chat on WhatsApp

Here are the key questions project buyers, contractors, developers and distributors usually ask before working with AMJ.

Are you a factory?

Yes. AMJ is a factory-based aluminum window and door manufacturer in Guangdong, China, with our own production plant, technical team, equipment, QC process, and export packaging system.

What should I send for a quotation?

Please send project drawings, window and door schedule, sizes, quantities, glass requirements, frame color, hardware options, project location, and expected delivery time.

Can you customize products according to project drawings?

Yes. We can customize sizes, opening styles, glass, colors, hardware, and system solutions according to your drawings and project requirements.

Are your products suitable for export projects?

Yes. We provide aluminum window and door solutions for residential, commercial, and custom projects, and can match suitable configurations according to different market requirements.

Do you have certifications or test reports?

Yes. AMJ has NFRC, CSA and ISO management system certifications, and experience with AS2047 / AGWA requirements for the Australian market. Project-specific testing can also be arranged if needed.

What types of aluminum windows and doors do you offer?

We offer casement, sliding, awning, double hung, tilt-turn windows, as well as sliding, casement, bi-fold, pivot and other aluminum door systems.

How do you control quality before shipment?

Before shipment, we check profiles, glass, hardware, dimensions, surface finish, opening operation, sealing, assembly quality, and packaging. Photo/video inspection or third-party inspection is also available.

How do you package products for export?

We use reinforced export packaging, protective film, corner protection, foam, crates or steel frames, and clear job-site labels to reduce damage and support easier installation.

What is your normal production lead time?

Normally, production takes around 25–35 days after drawings, specifications, payment terms, and production details are confirmed. The exact lead time depends on order quantity, product system, glass, color, and hardware configuration.

What warranty and after-sales support do you provide?

AMJ provides up to 10 years product warranty depending on the product system, glass, hardware, and project conditions. We also provide installation guides, installation videos, technical support, spare parts support, and project follow-up service.

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Foshan AMJ Windows and Doors Co., Ltd.