
Modern Casement Windows
DERCHI S8 Slim Frame Series Modern Aluminum Casement Windows deliver slim profiles, expansive glass, swing or horizontal opening, custom sizing, and enhanced casement window insulation for efficiency.

DERCHI S8 Slim Frame Series modern casement windows with slim aluminum frames.
Aluminum profile options: commercial grade, engineering grade, premium home grade.
Meets modern architecture standards with clean lines and balanced proportions.
Swing casement windows open wide for airflow and easy operation.
Supports horizontal casement windows for consistent project appearance.
High-density fiberglass components reduce heat transfer through the frame.
Proprietary frame design improves casement window insulation performance.
Large sizes available for wider openings and more natural daylight.
Slim frame supports broad outdoor views and stronger visual connection.
Frame system delivers strength, durability, and energy efficiency together.
Modular visual system simplifies design, matching, and configuration across products.
Global certifications support compliance across international markets.
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S8 Slim Frame Series Casement Windows
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DERCHI window and door

Description
Videos
Customizable Styles
Hardware Accessories
Advantages
Certificate
Inside DERCHI Factory: Production of S8 Slim Frame Modern Casement Windows
Tour the facility where the S8 Slim Frame Series comes to life. DERCHI’s 70,000 m² base and German machinery provide the precision needed for modern aluminum casement windows with ultra-slim profiles.From casement window insulation technology to durable swing casement windows, our 1.5 million m² annual capacity ensures we meet your project demands with top-tier quality.
Custom Style Modules for Modern Casement Windows
Supports 10 configurable layouts, including single and dual swing casement windows, fixed-glass combinations, split panels, angled tops, stepped shapes, and polygon designs, within defined operable and fixed panel size limits.

Custom Style Options
Single Swing Casement Window
One opening panel with hinges on one side. Opens left-hand or right-hand. Use when you need simple ventilation and easy cleaning access.
Three-Panel: Opening + Fixed + Opening
Two opening panels on both sides, fixed glass in the center. Keeps airflow on two sides while the center stays sealed and stable.
Upper Opening + Lower Fixed (Split Height)
Top section uses one or two opening panels. Bottom section uses fixed glass. Helps keep the lower area closed for safety, furniture, or railing zones.
Wide Layout: Side Opening + Large Center Fixed
Opening panels on both sides with a wider fixed center panel. Suits large wall openings where you want a main view area and side ventilation.
Large Opening with Top Fixed Band
Main opening uses multiple panels across the width. A fixed glass band sits above as a transom. Adds extra light while keeping the main opening size controlled.
Angled Top: Left Opening + Right Fixed
Left panel swings open. Right panel stays fixed. The top edge is sloped to follow a stair or roof line. Use when the opening shape is not rectangular.
Angled Top: Right Opening + Left Fixed
Right panel swings open. Left panel stays fixed. Sloped top matches the same angled conditions. Choose this when the opening side must swap due to traffic or furniture.
Stepped Fixed Glass: Left Opening + Step Shape
Left panel swings open. Fixed glass steps up beside or above it. Helps avoid beams or corner limits while keeping an opening panel where you need it.
Stepped Fixed Glass: Right Opening + Step Shape
Right panel swings open. Fixed glass steps up beside or above it. Same purpose as the left version, but fits a reversed room layout.
Polygon Shape with Double Swing Panels (French Casement)
Two opening panels meet at the center and swing open from the sides. Outer frame is polygon-shaped. Use for feature openings where the wall shape is angled.
Size Limits (Production Rules)
Opening panel (operable) size range
Width: 400–700 mm
Height: 450–1500 mm
Fixed glass panel limit
Each fixed panel area: ≤ 8 m²

Modern Casement Windows for Slim Aluminum Projects
DERCHI S8 Slim Frame Series modern casement windows use a narrow 6063-T5 aluminum frame. They support swing casement windows and horizontal casement windows layouts. Custom sizes and powder-coated colors fit different project needs.
Double tempered glass is standard at 5mm + 27A + 5mm. Low-E and triple insulated glass are available. This build improves casement window insulation and helps reduce indoor temperature swings.
The system supports wind resistance, water resistance, and sound reduction. Wehag hardware is used, with a warranty over five years. Compliance includes NFRC, CSA, AS2047, CPR, and CE. Typical use includes villas, apartments, hotels, living rooms, and exterior walls.
Key Benefits
S8 Slim Frame Series modern casement windows offer overseas installation, CE/NFRC/AS2047 certification, insulation, WEHAG hardware, Xinyi Low-E glass, 24mm thermal break, water-swelling seals, 1.8mm multi-cavity frames, six-point locking, sealant-filled corners.

Overseas Installation and Certifications
Project teams can request installation support in the US, Canada, and Australia. CE, NFRC, and AS2047 documents help meet local code and tender needs site requirements.

Seasonal Insulation Cost Control
Casement window insulation reduces heat gain on sunny days and heat loss at night. It can lower HVAC run time in many climates and reduce bills.

WEHAG Hardware Seal Support
WEHAG hardware supports opening and closing, and maintains panel pressure on seals. It helps reduce air leaks, water leaks, and service calls over repeat use cycles.

Xinyi Low-E Glass System
Xinyi insulated Low-E tempered glass helps limit heat transfer and reduces fog risk. Tempered panes improve safety, and the insulated unit can cut outside noise levels.

24mm Thermal Break Strip
A 24mm thermal break strip of PA66-GF interrupts frame conduction. This reduces heat transfer, lowers condensation risk, and supports comfort in winter and summer indoors homes.

Water Swelling EPDM Seal
Water-swelling EPDM seal expands when wet to fill gaps. It improves resistance during storms, supports drainage control, and can lower wind noise around the panel edge.

1.8mm Multi Cavity Profiles
1.8mm multi-cavity profiles add stiffness and keep shape under load. Triple seals support air sealing, water control, and noise reduction on horizontal casement windows in homes.

Six Point Locking System
Six-point locking system secures the panel on all four sides. Even lock pressure helps sealing under wind, and improves security for swing casement windows at home.

Sealant Filled Corner Joints
Sealant-filled corner joints strengthen frame connections and block leak paths at corners. This supports alignment, reduces rework risk, and extends service life for owners and builders.
Get a Quote for Modern Casement Windows
Request pricing and lead times for the S8 Slim Frame Series modern casement windows. Share your size, opening style, glass needs, and target certification (CE/NFRC/AS2047). Our team will return a quote and project support options.
Performance Metrics
This section covers six metrics—water tightness, air tightness, wind pressure resistance, sound insulation, U-Factor, and SHGC—to guide selection, energy planning, and risk control for swing and horizontal casement windows.
U-Factor (U.S./1-P) (0.23)
0.23 indicates the rate of heat transfer through the window. A lower U-Factor supports energy savings by reducing heat loss and heat gain. Use it in energy models and compliance reviews; confirm the local test method when required.
Wind pressure resistance (5 kPa)
The unit is rated to withstand 5 kPa wind pressure. This helps control frame movement that can affect sealing and operation. It supports safer specification for high-rise, coastal, and open-site projects.
SHGC (0.20)
0.20 shows the share of solar heat that enters through glazing. A lower SHGC supports cooling-load control in warm seasons and high-sun exposures. It helps teams select glazing by climate, façade orientation, and energy targets.
Water tightness (700 Pa)
The window resists rain leakage at a 700 Pa pressure difference. This helps reduce water intrusion risk on exposed walls. It also supports project decisions for wind-driven rain zones and taller buildings.
Air tightness (1.2 m³/(m·h))
This value shows air leakage through joints per meter per hour. Lower leakage supports casement window insulation goals by limiting drafts and reducing HVAC demand. It applies to both swing casement windows and horizontal casement windows designs.
Sound insulation performance (35 dB)
The system provides 35 dB sound reduction under test conditions. This supports indoor noise targets for residential and commercial spaces. It can help reduce complaints in traffic, mixed-use, and urban areas.
Modern Casement Windows Specifications
Review key parameters for DERCHI S8 Slim Frame Series casement windows, including thermal break profile, glazing options, hardware, finishes, and available sizing.
| Parameter | Details |
| Model | S8 Slim Frame Series Casement Windows |
| Brand | DERCHI |
| Profile | 6063-T5 thermal break aluminum profile |
| Thickness | 1.8 mm aluminum thickness |
| Available Size | Opening panel width: 400–700 mm; Opening height: 450–1500 mm; Each fixed panel ≤ 8 m² |
| Glass | Double tempered glass: 5mm + 27A + 5mm; Optional: triple tempered, laminated, Low-E, reflective, tinted glass |
| Middle Hollow | 5mm + 27A + 5mm |
| Hardware | Germany brand WEHAG |
| Surface Treatment | Powder coating, anodized, wooden grain, PVDF coating |
Modern Casement Windows Applications
Use these modern casement windows across apartments, villas, hotels, offices, outdoor rooms, and exterior façades to support ventilation, insulation, and space planning.

Apartment
Use modern casement windows for bedrooms, living rooms, and kitchens. Specify casement window insulation to reduce heat gain and outside noise. Choose opening direction based on furniture layout and safe access for cleaning. Use insect screens where required by local code.

Home Office
Set windows near the desk to manage glare and support airflow. Swing casement windows can direct air into the room when needed. Add insulation and sealing upgrades to support stable indoor temperature during long work hours. Use limited opening for child safety where needed.

Hotel
Apply modern casement windows in guest rooms and corridors to support quiet operation and controlled ventilation. Use casement window insulation to limit outside noise and reduce HVAC load. Select hardware that supports frequent use and easy staff inspection. Plan opening limits to meet safety rules.

Office Building
Use casement units in perimeter offices, meeting rooms, and stairwells for natural ventilation. Consider horizontal casement windows in areas with wide wall bays or shared mullion lines. Specify insulation and sealing to reduce drafts near workstations. Coordinate openings with façade modules and cleaning access.

Outdoor
Install in covered patios, pool houses, or garden rooms where airflow matters. Use swing openings to manage wind direction and keep rain out during light weather. Add screens for insects. Specify insulation where the space is conditioned and needs temperature control.

Residential building
Use modern casement windows for unit façades, hallways, and shared lounges. Plan opening sizes to meet ventilation targets and emergency access rules. Specify casement window insulation for energy goals and comfort. Standardize sizes to support procurement and future maintenance.

Exterior
Apply the S8 Slim Frame Series as part of the main façade system. Align window modules with cladding joints and structural grids. Use insulation and sealing specs to support air and water control. Choose opening types based on wind exposure and access for cleaning from inside.

Villa
Use larger casement units for living areas and suites to support cross-ventilation. Swing casement windows work well for capturing breezes from gardens and courtyards. Specify casement window insulation for conditioned rooms and sun-exposed elevations. Coordinate openings with security needs and shading devices.





Why Choose DERCHI for S8 Slim Frame Series Casement Windows (modern casement windows)
DERCHI supports modern casement windows with proven experience, large manufacturing capacity, strong output history, recognized certifications, patents and awards, an engineer research team, global distribution, reliable suppliers, 100% inspection, and one-stop service.
· 15+ years in aluminum windows and doors for modern casement windows, including swing casement windows and horizontal casement windows
· 70,000+ ㎡ factory and 4,000 ㎡ showroom with 600+ employees for production, testing, and customer visits
· 600,000+ ㎡ annual output and 200,000+ completed cases to support stable lead times and repeatable delivery
· Certified by NFRC, CE, AS2047, CSA, and ISO9001 to support code needs and project documentation
· 100+ patents (invention, appearance, design) that support structure, sealing, and casement window insulation details
· 50+ industry honors that reflect performance results, delivery record, and service feedback
· 20+ engineer research team improving frames, water paths, and hinge strength for the S8 Slim Frame Series
· 700+ distributors and customers in 100+ countries for quoting support, samples, and after-sales follow-up
· Work with global raw material and hardware brands to keep parts consistent and supply stable
· 100% full inspection before shipment: size, surface, glass fit, operation, and packaging records
· One-stop customer service from ordering to shipment, including drawings, updates, packing lists, and export documents
Certificates & Test Reports
Display key certifications and test documents for modern casement windows, including NFRC, CE, AS2047, CSA, and ISO9001, with downloadable proof for project approvals.












Hardware Options Overview
DERCHI offers handles, gearboxes, and 13-inch friction hinges with OEM/ODM support for multiple casement window types.



Project Gallery: S8 Slim Frame Installations
Showcase completed projects and real installation photos of swing casement windows and horizontal casement windows, with project type, location, and performance notes.
Explore Other Window Options
Provide quick navigation to other DERCHI product categories to help buyers compare solutions by application, opening type, and budget before requesting a quote.
Related Products for Modern Casement Windows
Recommend matching options such as different opening styles, glazing packages, and insulation upgrades to support casement window insulation needs and consistent design across a project.


