
Inward Opening Casement Windows
DERCHI's K5N inward open casement window combines superior soundproof technology with easy maintenance. This soundproof window excels in urban settings but suits any space. Experience our inward casement window solutions today.












The DERCHI K5N-Inward Open Soundproof Casement Window delivers exceptional noise reduction performance. The sleek inward casement window design complements any modern home. The secure multi-point locking system ensures easy operation. Superior soundproof casement window technology provides excellent acoustic insulation. The DERCHI K5N is the perfect inward open casement window for peaceful living.
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
DERCHI offers complete customization for K5N soundproof casement windows. Choose from various colors, glass types, and window configurations to match your project needs. Our inward open casement windows combine design flexibility with acoustic performance for personalized solutions.

Color Customization
DERCHI K5N-Inward Open Soundproof Casement Windows offer extensive color options for different design preferences. These soundproof casement windows provide aesthetic flexibility for residential and commercial projects.
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 personalized inward casement window designs
> Coating Types: Powder coating, anodizing, and fluorocarbon finishes with varying durability and weather resistance for soundproof window applications
These color options allow architects to select the perfect inward open casement window finish based on building aesthetics, environmental conditions, and design requirements.Retry

Glass Customization
DERCHI K5N-Inward Open Soundproof Casement Windows offer multiple glass configurations for different performance requirements. These soundproof casement windows provide enhanced acoustic, thermal, and security features for residential and commercial projects.
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 allow architects to specify the ideal 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 multiple configuration options for different architectural requirements. These soundproof casement windows provide design flexibility for residential and commercial projects.
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.

What is K5N Inward Casement Window?
The K5N is an inward casement window engineered for superior sound insulation. This soundproof window features thermal break aluminum profiles with 2.0mm wall thickness. The inward open casement window design saves exterior space while providing easy cleaning access.
Triple glazing with inert gas achieves 37dB sound reduction. The soundproof casement window blocks noise through 6mm tempered glass panels separated by 16mm spaces. Fluorocarbon-treated spacers resist discoloration.
The system delivers Grade 8 air tightness, Grade 9 wind resistance (5kPa), and Grade 10 water tightness. DERCHI combines precision engineering with quality materials for reliable performance in residential and commercial applications.
Key Features of the K5N Inward Casement Window
The K5N Series combines cutting-edge soundproof technology with inward casement window functionality. This system delivers superior acoustic performance while maintaining sleek aesthetics and reliable operation for modern living spaces.

Glass Configuration
> Triple-layer tempered glass (6mm+16A+6mm+16A+6mm) blocks sound transmission effectively
> Inert gas fills insulating glass cavities to enhance sound reduction
> Gas-filled chambers prevent internal fogging and condensation formation
> Fluorocarbon-coated aluminum spacers resist yellowing and discoloration over time
> DERCHI logo printed on spacer bars ensures product authenticity
> 37dB sound reduction rating meets professional acoustic standards
Frame Assembly
> Injection-molded corner connectors join frames, mullions, and sashes precisely
> Two-component sealant fills corner joints for watertight connections
> 2.0mm profile wall thickness provides structural stability and durability
> Seamless corner integration prevents water infiltration at connection points
> Industrial-grade assembly process ensures consistent joint quality


Hardware Components
> Wehagen baseless antibacterial handle inhibits bacterial growth on contact surfaces
> Heavy-duty Wehagen hinges support sash weights up to 120kg
> Anti-skew transmission box maintains proper alignment during operation
> Hardware system reduces mechanical failure through precision engineering
> Smooth operation mechanism ensures long-term reliability
Structural Design
> Continuous foam weatherstrip with bent corners eliminates corner gaps
> Anti-collision corner protectors prevent injury from sharp edges
> Flat interior frame design creates clean, minimalist appearance
> Optional sound and thermal insulation cotton fills frame cavities
> Interior-facing operation provides convenience and safety
> Wind pressure resistance up to 5kPa handles extreme weather

Transform Your Living Space with Superior Sound Control
Experience 37dB noise reduction with DERCHI's K5N soundproof casement windows. German hardware, triple-layer glass, and 25+ years of expertise ensure exceptional performance. Let our team create the perfect custom solution for your project.
Professional Performance Standards
The K5N inward open casement window delivers certified performance across five critical metrics. Each soundproof window undergoes rigorous testing to ensure consistent quality. These professional ratings demonstrate how our inward casement window system protects your interior environment from external elements while maintaining comfort and energy efficiency year-round.
Thermal Insulation: 1.0W/(m²·K) - Level 10
A thermal transmittance value of 1.8 watts per square meter-kelvin results in a grade 7 thermal insulation rating. The thermal break in the aluminum frame and the insulated glass unit reduce heat flow. This helps maintain a consistent indoor temperature and lowers energy consumption for heating and cooling.
Wind Pressure Resistance: 5kPa - Level 9
Withstands extreme wind loads up to 230 km/h without structural failure. This soundproof casement window remains stable during typhoons and severe weather events. Reinforced frames, heavy-duty hardware, and secure glass mounting ensure the window maintains integrity under maximum pressure conditions.
Water Tightness: 700Pa - Level 6
Prevents water infiltration during heavy rainfall and storms. This rating means the soundproof casement window remains completely dry inside even when facing driving rain equivalent to 160 km/h wind speeds. The multi-seal design channels water away from frame joints and glass interfaces.
Air Tightness: 1.2m³/(m²·h) - Level 8
Minimizes air leakage to reduce energy loss and dust infiltration. This inward casement window allows less than 1.2 cubic meters of air passage per square meter per hour. Triple weatherstripping and precision-fitted components create an airtight seal that maintains indoor climate control.
Sound Insulation: 37dB - Level 4
Reduces external noise by 37 decibels for peaceful interiors. This soundproof window transforms busy street noise (70dB) to library-quiet levels (33dB). Triple-glazed glass with gas-filled chambers blocks sound waves while the tight frame seals prevent acoustic leaks around window perimeters.
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 |
Application Scenarios
The K5N-Inward Open Soundproof Casement Window delivers superior acoustic performance with 37dB sound reduction. Its inward opening design maximizes space efficiency while providing easy maintenance access. Triple glazing with argon gas filling ensures exceptional noise control for demanding environments.

Commercial
Office buildings, hotels, healthcare facilities, and educational institutions require effective noise control. The inward open soundproof window blocks external disturbances while enabling easy maintenance from inside. Professional spaces benefit from acoustic privacy and peaceful work environments.

Residential
Urban homes face traffic noise and neighborhood sounds. The soundproof casement window creates tranquil living spaces for apartments, condominiums, and private residences. Inward opening design saves space while providing superior acoustic comfort for bedrooms, home offices, and family areas.


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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