Interior storm windows for casement windows from DERCHI are custom thermal break aluminum inward-opening window systems — not thin removable storm inserts. The main recommended K5N Kirin series combines triple glass, high impact positioning, and thermal break construction, with E5N Langyue and E6N Xingyue as alternative configurations for different opening sizes and project needs.
- Permanent triple-glass thermal break storm alternative, not a removable insert
- K5N Kirin main series with E5N and E6N alternatives for varied project scenarios
- Custom-organized based on project drawings, dimensions, and configuration intent
- Inward opening design for interior cleaning access and child safety
Product Details
The product family spans three inward-opening thermal break aluminum series. K5N Kirin serves as the primary recommendation, positioned with triple glass, high impact construction, thermal break, sound insulation, and impact protection for residential projects. Specific K5N frame dimensions and performance values are pending confirmation — buyers should request test reports during inquiry. E5N Langyue offers an 85mm frame with 2.0mm wall thickness and 35mm thermal break strip, paired with 5+27A+5 double tempered insulating glass and fluorocarbon aluminum spacer bearing the DERCHI logo. E6N Xingyue widens the frame to 103mm while maintaining the same wall thickness and strip width, adding triple sealing, vertical isotherm design, hidden drainage, and glue-injected corner joints.
For custom interior storm windows for casement windows, the E5N suits narrow tall openings, bathrooms, and bedrooms where controllable ventilation matters. E6N targets taller window openings and project residential applications. Both support inward opening and tilt-and-turn, with optional screen sash configurations. Packaging applies four-layer protection — anti-scratch film, pearl cotton, waterproof outer film, and wooden frame — with door-to-door or port shipping available. Platform data indicates approximately 25–35 days delivery, subject to confirmation based on order volume and destination.
Product Features
Triple Glass Thermal Break System: K5N combines triple glass with thermal break aluminum as a structural storm alternative — upgrading energy and acoustic performance beyond removable inserts. Confirm specific glass configuration during inquiry.
Inward Opening Safety: Sashes open inward, giving occupants interior cleaning access — particularly valuable for upper-floor units. Child safety handles and controllable tilt-and-turn ventilation add household protection without sacrificing airflow.
Impact Protection: K5N is positioned as a high impact series. E6N features corner joint construction described as stronger than standard screw connections. Request specific impact test standards before specification.
Thermal Insulation Engineering: E6N incorporates 35mm PA66 thermal break strip with vertical isotherm design and seven-level insulation. E5N references 1.8W thermal level. Confirm exact U-values and test standards during inquiry.
Sealing and Drainage: E6N integrates triple sealing, hidden drainage, and glue-injected corner joints to manage water and air leakage. Internal and external flush surfaces pair with pressure glazing strip processes for consistent weather resistance.
Sound Insulation: E5N references 35dB sound insulation with 5+27A+5 double tempered glass. Actual acoustic performance depends on glass type and installation — confirm test methods for target rating.
Customizable Styles
Glass Configuration: K5N uses triple glass; E5N and E6N come standard with 5+27A+5 double tempered insulating glass. Optional 48/88 edge wrapping available. Confirm K5N glass thickness and coating options during inquiry.
Frame and Structure: Options range from single sash to multi-pane window walls, including fixed+opening, three-segment, top light, asymmetric, slanted, hexagonal, and bay window combinations for project-specific layouts.
Custom Dimensions: Sizes are organized to project drawings with a common MOQ of 2 square meters. Buyers should provide opening dimensions and structural requirements for accurate production planning.
Colors and Finishes: Available colors include Sand Gray, Dark Coffee, Black Crystal, White, Black Walnut, Pear Wood, Indigo Gray, Mint Gold, plus E5N card additions like Retro Green and Deep Sea Blue.
Opening Configuration: Inward opening and tilt-and-turn styles available. With-screen versions feature glass sash inward opening and screen sash inward opening. Confirm project-specific opening direction and sash layout.
Hardware Accessories
Handles: Child safety handles available across configurations. E6N features WEHAG baseless glass sash handle. Buyers should specify handle type, finish, and safety requirements during project inquiry.
Locking Hardware: E6N includes screen sash password handle. Project-specified hardware can be configured to meet different security standards. Confirm lock mechanisms and compatibility before production.
Opening Mechanisms: Inward opening and tilt-and-turn hardware systems support flexible ventilation control. Specify preferred opening style, sash weight, and frequency of use for proper hardware selection.
Screen Systems: With-screen versions provide glass sash and screen sash both opening inward. Confirm mesh type, frame color, and screen dimensions to match project ventilation and insect protection needs.
Safety Accessories: Additional safety accessories can be configured per project specification. Buyers should clarify child safety requirements, fall protection standards, and any local building code compliance needs.
Basic Parameters
Performance Item | Available Information | Buyer Notes |
|---|---|---|
Thermal Insulation | E5N: 1.8W level; E6N: 7 levels with 35mm PA66 strip and vertical isotherm; K5N: pending confirmation | Confirm U-value unit, test standard, and what seven levels refers to before specification |
Wind Pressure Resistance | E5N: approximately 5kPa; K5N: pending confirmation | Confirm exact rating, test standard, and applicable series version |
Water Tightness | E5N: 550-700Pa; K5N: pending confirmation | Confirm which E5N version (with or without screen) this applies to |
Air Tightness | E5N: 1.2; K5N: pending confirmation | Confirm classification standard and whether with-screen version affects the rating |
Sound Insulation | E5N: 35dB with 5+27A+5 glass; K5N: pending confirmation | Confirm glass configuration and test method for target acoustic rating |
Product Specifications
Parameter | Details |
|---|---|
Product Name | DERCHI Custom Thermal Break Aluminum Inward Opening Window |
Product Type | Casement window (inward opening, thermal break aluminum) |
Main Series | K5N Kirin (triple glass, high impact) |
Alternative Series | E5N Langyue (85mm frame), E6N Xingyue (103mm frame) |
Material | Thermal break aluminum with PA66 strip (35mm on E5N/E6N) |
Glass | K5N: triple glass (config to confirm); E5N/E6N: 5+27A+5 double tempered insulating |
Frame Width | E5N: 85mm; E6N: 103mm; K5N: to be confirmed |
Wall Thickness | E5N/E6N: 2.0mm; K5N: to be confirmed |
Thermal Break Strip | E5N/E6N: 35mm; K5N: to be confirmed |
Surface Finishes | Powder coating, fluorocarbon, wood grain, metal flash silver |
Opening Style | Inward opening, tilt-and-turn; with-screen versions available |
Customization | Custom sizes, colors, structure, hardware per project drawings |
MOQ | Commonly 2 square meters (subject to confirmation) |
Packaging | Four-layer: anti-scratch film, pearl cotton, waterproof film, wooden frame |
Logistics | Door-to-door or port shipping; approximately 25-35 days delivery |
Notes | K5N specific dimensions and performance values pending confirmation |
Advantages
Permanent Storm Alternative: Unlike removable inserts, this system provides a structural triple-glass thermal break window upgrade — delivering lasting energy, sound, and impact performance as a permanent installation.
Multi-Series Family: K5N targets high-impact triple glass needs, E5N suits narrow tall openings, and E6N handles taller project residential windows — giving buyers series-level selection flexibility.
Configuration Flexibility: Extensive structure options, color palette, surface finishes, glass types, and hardware choices let project teams match architectural and performance requirements without compromise.
Inward Opening Safety: Interior sash access simplifies cleaning at height, while child safety handles and controllable tilt-and-turn ventilation add occupant protection for residential environments.
B2B Procurement Support: Custom MOQ of 2 square meters, four-layer packaging, door-to-door or port shipping, and project-specified hardware configuration support commercial interior storm windows for casement windows procurement.
Application Scenarios
Apartment: Interior storm windows for casement windows help apartment owners upgrade existing openings with triple-glass thermal break performance. Inward opening suits limited exterior access, while child safety handles address family occupancy needs in multi-unit buildings.
Home Office: Reduced exterior noise supports concentration during work hours. E5N's 35dB sound insulation reference and tilt-and-turn ventilation let occupants manage airflow without fully opening the sash during calls or focused tasks.
Hotel: Guest rooms benefit from acoustic separation and thermal comfort. Inward opening allows housekeeping to clean exterior glass from inside, reducing maintenance logistics for upper-floor rooms. Confirm fire and safety code compliance for hospitality projects.
Office Building: Commercial interior storm windows for casement windows can supplement existing facades with thermal and acoustic layers. Tilt-and-turn ventilation supports occupant comfort. Confirm local building code and wind-load requirements before specification.
Outdoor: For openings exposed to weather, buyers should confirm water tightness, wind pressure resistance, and surface finish durability for the specific climate. E5N references 550-700Pa water tightness — verify whether this applies to your selected configuration.
Residential Building: Multi-unit residential projects can specify different series per unit type — K5N for impact-rated units, E5N for bathrooms and bedrooms, E6N for taller living room openings. Custom dimensions accommodate varied floor plan layouts.
Exterior: When installed as exterior-facing openings, confirm thermal break strip width, glass coating options, and hidden drainage performance. Surface finishes like fluorocarbon and powder coating offer weather resistance — verify suitability for local UV and moisture conditions.
Villa: Villa projects often combine varied opening shapes — bay windows, hexagonal, slanted, or asymmetric layouts. The extensive structure option list supports architectural customization, while multiple color and finish choices match interior design themes.
Inquiry Guidance
To request a quote, please share your project location, required size, quantity, preferred frame color, glass type, hardware requirements, and drawings or reference photos if available.
FAQ
What is the difference between this product and a removable storm insert?
This is a permanent triple-glass thermal break inward-opening aluminum window — not a thin removable panel. It provides structural energy, sound, and impact upgrades organized to your project drawings and dimensions.
Which series should I choose for my project?
K5N Kirin targets high-impact triple glass needs. E5N Langyue suits narrow tall openings and bathrooms. E6N Xingyue fits taller openings and project residential. Share drawings and performance requirements for series recommendation.
What information do I need to provide for a quotation?
Provide quantity, opening dimensions or drawings, destination, and configuration — glass type, color, finish, hardware, screen, and structure. This helps the interior storm windows for casement windows supplier prepare an accurate quote.
What is the MOQ and delivery time?
Platform data indicates a common MOQ of 2 square meters and approximately 25-35 days delivery. These are subject to confirmation based on order volume, configuration, and shipping destination. Verify current lead times during inquiry.
Can I configure hardware and screens?
Yes. Hardware is configured per project specification, including child safety handles, tilt-and-turn mechanisms, and WEHAG options on E6N. With-screen versions provide glass and screen sash both opening inward.
What are the K5N specific performance values?
K5N frame dimensions, glass configuration, and performance values are pending confirmation. E5N and E6N data serve as family reference. Request K5N test reports from the interior storm windows for casement windows manufacturer before specification.
Are certifications and technical documents available?
Buyers should request available certifications, test reports, cross-section drawings, and compliance documents for the selected series during inquiry. Confirm whether documents apply to your target market and configuration before ordering.
