
Inward open soundproof casement windows
The DERCHI K5N-Inward Open Soundproof Casement Window is an inward casement window that swings inward like a door, bringing airflow with less outdoor noise. It’s an inward open casement window for apartments, bedrooms, and offices where comfort matters. But it’s not the only use case—this soundproof window also suits busy streets and high-rises. Explore our soundproof casement window options and answers to your most asked questions.
DERCHI’s K5N-Inward Open Soundproof Casement Window is an inward open casement window engineered with multi-point locking and compression seals to help reduce outdoor noise while maintaining smooth, controllable ventilation. As an inward casement window, it’s ideal for high-rise apartments, bedrooms, and kitchens where inside opening supports safer cleaning and everyday convenience. But it’s equally effective for home offices, street-facing rooms, and renovation projects that demand a quieter interior. Explore our soundproof casement window configurations—including glass and hardware options—and find clear answers to common sizing, performance, and installation questions.
100% waterproof and Anti-theft
CE /NFRC Standard Certification
US/ AU IGCC Standard Glass Certification
100% thermal insulation/windproof/ soundproof

Description
Videos
Customizable Styles
Hardware Accessories
Advantages
Certificate
The K5N: A True Soundproof Casement Window
Tired of outside noise disrupting your peace? Discover the solution with the K5N inward casement window, a truly soundproof window designed for modern living.
This video demonstrates the exceptional acoustic performance of our inward open casement window. You'll see a live test where this soundproof casement window dramatically reduces noise levels, achieving an incredible 47-decibel difference between the outside and your quiet interior.
Witness for yourself how it effectively blocks out everything from busy street traffic to other environmental sounds. Upgrade your home to the K5N soundproof inward casement window and transform your space into the sanctuary of quiet you deserve.
Tailored Window Solutions
Explore a variety of customization options for colors, glass, and window configurations to suit diverse architectural and functional needs.

Color Customization
DERCHI K5N-Inward Open Soundproof Casement Windows support clear color specification for project delivery. The program includes stock colors for faster sourcing and custom options for design control on inward casement window systems.
Available Color Options:
Stock Colors: Pearl White, Deep Sea Blue, Black Skin, Caramel Coffee, Deep Coffee, Quartz Gray, Black Crystal Stone, and Starry Sky Black for immediate availability
Custom Finishes: Color matching service, wood grain patterns, metallic tones, and two-tone combinations for inward open casement window designs
Coating Types: Powder coating, anodizing, and fluorocarbon finishes for durability and weather resistance in soundproof window applications
For accurate results, specify a color code or physical sample, confirm gloss level, and approve a final sample under site lighting before production. For exterior exposure, select the coating type based on UV, humidity, and coastal conditions.

Glass Customization
DERCHI K5N-Inward Open Soundproof Casement Windows offer various glass configurations to meet performance standards. These soundproof casement windows are designed to enhance acoustic, thermal, and security features for both residential and commercial use.
Available Glass Options:
Performance Glass: Laminated, triple glazing, and Low-E options for superior sound reduction and energy efficiency in inward casement windows
Specialty Glass: Reflective, tinted, and bullet-proof varieties for privacy, solar control, and security applications
Advanced Features: Smart glass technology, frosted patterns, and tempered safety glass for specific functional needs
Configuration Options: Various thickness combinations, spacer bar types, and gas fills for customized soundproof window performance
These glass options provide architects with the flexibility to select the best inward open casement window solution based on acoustic requirements, climate conditions, and security needs.

Window Configuration Customization
DERCHI K5N-Inward Open Soundproof Casement Windows offer various configuration options to suit different architectural designs. These windows provide flexibility for both residential and commercial projects, ensuring functionality and aesthetic appeal.
Available Configuration Options:
Window Combinations: Hexagonal bay, large combination, double casement, and four-panel folding systems with various fixed and operable sections
Opening Mechanisms: Inward casement operation combined with sliding, folding, and bi-directional movement for flexible ventilation
Special Designs: Arched tops, picture windows with side casements, transom windows, and symmetrical configurations for unique buildings
Decorative Features: Diamond grilles, muntin bars, and custom divided light patterns for enhanced aesthetic appeal
These configuration options allow architects to select the ideal inward open casement window design based on building aesthetics, space requirements, and functional needs.

K5N Product Details
DERCHI K5N is an inward open casement window with tilt-and-turn operation. It supports secure ventilation and indoor cleaning for homes and light commercial projects.
This soundproof casement window uses triple tempered glass with gas-filled cavities and aluminum spacers to cut noise by up to 37 dB. Multi-point sealing helps prevent sound leaks around the sash and frame.
The 6063-T5 aluminum frame uses 2.0 mm wall thickness and sealed corners for water control. It reaches 5 kPa wind pressure resistance, 700 Pa water tightness, and 1.2 m³/(m²·h) air tightness. Thermal transmittance is 1.0 W/(m²·K). CE / NFRC / CSA and IGCC glass certification support compliance needs.
What’s Included in the K5N Design
K5N combines triple tempered glass, sealed frame joints, rated hardware, and continuous perimeter sealing. Published ratings should be confirmed with test reports. Final performance depends on installation quality, wall structure, and site conditions.

Glass Configuration
> Triple-layer tempered glass uses 6mm+16A+6mm+16A+6mm to reduce sound transfer through the glazing unit.
> Inert gas fill in insulating cavities reduces sound movement and supports heat control between glass layers.
> Gas-filled cavities help lower condensation risk inside the sealed unit when the edge seal remains intact.
> Fluorocarbon-coated aluminum spacers are specified to resist yellowing; request material specifications for verification.
> Spacer bars include the DERCHI logo to support product identification during receiving and inspection.
> Sound reduction is rated at 37 dB in product data; request the test report and note results vary by installation.
Frame Assembly
> Injection-molded corner connectors join frame, mullion, and sash parts to keep angles consistent at joints.
> Two-component sealant fills corner joints to support water resistance at frame connections.
> Profile wall thickness is 2.0 mm to support load handling and reduce frame distortion under use.
> Seamless corner integration reduces water entry paths that often form at joint transitions.
> Standardized assembly steps support consistent joint output across units and production batches.


Hardware Components
> Wehagen baseless antibacterial handle is specified to reduce bacterial growth on touch surfaces; request supplier test data.
> Wehagen hinges are rated to support sash weight up to 120 kg when installed per specification.
> Anti-skew transmission box supports sash alignment to reduce tilt during opening and closing cycles.
> Matched hardware set keeps components compatible and reduces misfit during installation and servicing.
> Operating parts support low-friction movement; service life depends on use frequency, adjustment, and maintenance.
Structural Design
> Continuous foam weatherstrip with bent corners covers perimeter corners to reduce sealing gaps.
> Anti-collision corner protectors cover exposed edges to reduce contact risk during operation and cleaning.
> Flat interior frame profile supports simple cleaning and a consistent interior line.
> Optional sound and thermal insulation cotton can be added in frame cavities for sound and heat control.
> Inward-opening design allows operation and cleaning from inside the room.
> Wind pressure resistance is rated up to 5 kPa in product data; confirm with reports and note site exposure affects results.

Technical Specifications
Comprehensive parameters and specifications for the DERCHI K5N-Inward Open Soundproof Casement Window, featuring premium materials and advanced engineering for superior acoustic performance.
| Parameter | Details |
| Product Name | K5N-Inward Open Soundproof Casement Window |
| Glass Configuration | Double Tempered Glass with argon gas 6mm+16A+6mmPVDF Aluminum Strip between double glass |
| Profile Material | 6063-T5 aluminum profile |
| Profile Thickness | 2.0MM |
| Frame Width | 114MM |
| Handle | WEHAG Handle in Black and Silver |
| Hardware | WEHAG 90° Tilt and Turn Accessories |
| Insulation Strip | Standard DERCHI insulation strip |
| Opening Method | Tilt and Turn / Inward opening |
| Sealing Material | EPDM rubber strip |
| Available Size | Opening Panel: Width: 510-850mm Height: 600-2400mm |
Professional Performance Standards
Five measured ratings cover heat control, wind load, rain resistance, air leakage, and noise reduction for stable indoor comfort and building protection.
Thermal Insulation: 1.0W/(m²·K) - Level 10
Reduces heat transfer through the window assembly. Helps keep indoor temperature stable across seasons. Supports HVAC planning by lowering unwanted heat gain or loss. Performance depends on glazing type, frame design, and installation sealing.
Wind Pressure Resistance: 5kPa - Level 9
Supports structural response under wind load. Helps maintain sash alignment and lock engagement during strong wind conditions. Reduces the risk of operational issues caused by frame or sash deformation. Results rely on correct anchoring and hardware setup.
Water Tightness: 700Pa - Level 6
Limits water entry during wind-driven rain. Helps protect interior finishes and adjacent wall layers. Reduces moisture risk at the window perimeter. Performance depends on flashing, drainage paths, and joint sealing at installation.
Air Tightness: 1.2m³/(m²·h) - Level 8
Controls air leakage when the window is closed. Helps reduce drafts and supports stable indoor pressure. Can reduce uncontrolled outdoor air exchange. Results depend on gasket condition, hardware adjustment, and frame-to-wall sealing.
Sound Insulation: 37dB - Level 4
Reduces outdoor noise entering the room. Supports quieter indoor work and rest conditions. The final effect depends on glass build, frame sealing, and the wall system around the window opening.
Application Scenarios
Built for projects where noise, airflow, and day-to-day usability affect comfort, focus, and customer experience.

Commercial
In street-facing offices, hotels, clinics, and retail sites, outside noise can disrupt calls, meetings, and customer talk. This window helps reduce noise intrusion and supports clear communication. The inward opening design supports controlled ventilation to refresh indoor air during operating hours. It fits renovation work where changing the building shell is limited and work schedules must stay on track.

Residential
In apartments and homes near busy roads, noise can affect sleep, study, and family time. This window helps reduce noise entering bedrooms and living spaces, improving daily rest and concentration. It supports regular ventilation to manage indoor air without leaving windows wide open. It suits upgrades where homeowners want a practical way to improve comfort without major changes to the room layout.


Why Choose Our K5N Inward Open Soundproof Casement Window
DERCHI combines advanced window technology with proven manufacturing expertise. Our K5N inward casement window delivers superior soundproofing through triple-glass design and thermal break technology. With 15+ years experience and comprehensive certifications, we ensure each soundproof window meets the highest standards from production to installation.
Triple Glass Technology
Three tempered glass panes with argon-filled cavities reduce heat transfer and energy costs. This design enhances safety through impact resistance while improving sound insulation. The triple-glass system creates quieter interiors, making it ideal for buildings near roads or railways. Low-E coating options further improve thermal performance
Advanced Structural Design
Our 2.0mm aluminum profiles provide structural strength to support heavy triple-glass panels. The 64mm insulation strip creates a wide thermal break that minimizes heat bridge and reduces condensation risk. This combination ensures long-term stability while helping achieve passive house energy standards. The robust design prevents deformation and maintains reliable hardware mounting.
Manufacturing Excellence
Our 70,000+ m² facility produces 400,000+ m² of windows annually. With 600+ skilled employees and modern equipment, we maintain consistent quality across all production batches. The 4,000 m² showroom displays our full product range. This scale enables us to meet large project demands while ensuring precision manufacturing.
Quality Assurance & Certifications
DERCHI holds NFRC, CE, AS2047, CSA, and ISO9001 certifications. Every inward casement window undergoes 100% inspection before shipment. Multi-point testing verifies soundproofing performance and structural integrity. Documentation accompanies each product to ensure traceability and quality control.
Innovation & Patent Portfolio
Our 20+ member R&D team focuses on soundproof window optimization. We hold 100+ patents including invention, appearance, and design patents. This investment in innovation drives continuous product improvement. Our team develops custom solutions for specific project requirements.
Industry Experience & Recognition
With 15+ years specializing in aluminum windows and doors, DERCHI has completed 200,000+ successful installations. We have received 50+ industry honors for quality, innovation, and environmental sustainability. Our experience ensures deep understanding of market requirements and technical challenges. This expertise translates into reliable soundproof casement window solutions.
Global Distribution Network
DERCHI operates through 700+ distributors across 100+ countries. Our established logistics channels ensure efficient international delivery. Local support in major markets provides technical assistance and service. This global reach demonstrates our capability to handle projects worldwide.
Quality Material Partnerships
We collaborate with leading hardware brands and trusted raw material suppliers. Regular supplier audits maintain consistent component standards. These partnerships ensure every inward open casement window uses quality materials. High-grade components contribute to product durability and performance.
Comprehensive Service & Warranty
Our 10-year warranty covers profiles, glass seals, and hardware systems. One-stop service includes technical consultation, installation guidance, and after-sales support. We provide complete assistance from order placement to final delivery. This comprehensive approach ensures customer satisfaction throughout the project lifecycle.
Certifications & Standards
International certifications verify our inward casement window quality. NFRC, CE, AS2047, CSA standards ensure global compliance and performance reliability.






Hardware Options
The K5N inward open casement window incorporates specialized hardware components that ensure smooth operation and enhanced soundproofing performance. These carefully selected hardware options work together to deliver reliable functionality for your soundproof casement window system.


Successful Project Cases
View 200,000+ soundproof window installations worldwide. From residential buildings to commercial projects, see how our products create comfortable spaces.
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