The 28 x 40 casement window is a made-to-size crank-operated aluminum window matched to the DERCHI WY-72, WY-86, and WY-100 series. With a 6063-T5 aluminum frame, EPDM sealing, and double tempered glass, it serves residential and commercial projects requiring controlled ventilation and weather performance.
- Nominal size 711 x 1016 mm (~0.72 m²) with hand-crank operation
- Frame depth options of 72 mm, 86 mm, or 100 mm to match project requirements
- Available as a cranked-out window with multiple glass and color configurations
Product Details
This aluminum casement window is built on a 6063-T5 aluminum profile with 1.4 mm wall thickness, paired with EPDM rubber strips for consistent sealing. The hand-crank mechanism allows the sash to swing outward, giving buyers a cranked-out window that captures cross-ventilation without obstructing interior space. Frame depth options of 72 mm, 86 mm, and 100 mm accommodate different glass packages and insulation needs.
Unlike sliding windows that only open partially, the 28 x 40 casement window opens fully along one side, directing airflow into the room. The WY-72 and WY-100 series use 5+27A+5 mm double tempered glass, while WY-86 uses 5+15A+5 mm — buyers should confirm which series matches their performance targets. This makes the window suitable for kitchens, bedrooms, and living areas where ventilation control matters.
Product Features
Hand-Crank Operation: The crank mechanism lets users open and close the sash without reaching outside, making this hand crank window practical for above-counter or stairwell installations.
6063-T5 Aluminum Frame: This alloy profile provides structural stability for the window frame while keeping weight manageable for shipping and installation across both residential and commercial projects.
Double Tempered Glass: Standard glass configurations use tempered panes for safety, reducing breakage risk — buyers can also explore laminated or Low-E upgrades for additional acoustic and thermal performance.
EPDM Weather Sealing: EPDM rubber strips along the frame help manage air and water infiltration, supporting the window's 350 Pa water resistance and 4.5 m³/(m·h) air infiltration values.
Multiple Frame Depths: With 72 mm, 86 mm, and 100 mm options, buyers can select the frame depth that aligns with their glass package, wall cavity, and thermal performance requirements.
Made-to-Size Production: The opening panel range of W450–800 mm × H600–1500 mm allows project-specific sizing, so buyers can match window dimensions to architectural drawings rather than stock sizes.
Customizable Styles
Size: The 28 x 40 casement window is produced to project dimensions within the W450–800 mm × H600–1500 mm panel range — provide CAD drawings for exact fit.
Frame Depth: Choose from 72 mm, 86 mm, or 100 mm frame depths depending on selected series, glass package, and project insulation requirements.
Color: Standard options include Pearl White, Quartz Gray, Starry Sky Black, Deep Coffee, and wood grain finishes — PVDF and custom colors carry an upcharge.
Glass: Configurations include 5+27A+5 mm or 5+15A+5 mm double tempered, with upgrades to triple, laminated, Low-E, and blind-glass options available.
Style Combinations: Options include single casement, awning, fixed-plus-operable composites, dual sash with fixed center, three-segment, and hexagonal or bay combinations.
Hardware Accessories
Hand Crank: WY-72 uses an American-style hand crank; WY-86 and WY-100 use an Australian hanging crank — confirm which style suits your operation preference.
Lock Seat: WY-72 pairs with a multi-point switch lock seat, while WY-86 and WY-100 use a single-point switch lock — selection depends on series.
Casement Limiters: Optional simple limiter (+60 RMB/pc) or safety limiter (+168 RMB/pc) restricts opening angle for ventilation control and child safety.
Screens and Safety Fences: Options include anti-theft screen, 304 HD mesh, King Kong mesh, 48-mesh high-transparency mesh, and fixed or opening safety fences.
Sealing Strip: EPDM rubber strips provide the primary weather seal — confirm replacement availability and compatibility with selected frame depth.
Basic Parameters
Performance Item | Available Information | Buyer Notes |
|---|---|---|
Thermal Insulation | U-Factor 0.39, SHGC 0.25 | Verify energy code compliance for target market; confirm if NFRC certification applies to selected model |
Wind Pressure Resistance | 5 KPa | Confirm this meets local building code wind load requirements for the installation zone |
Water Tightness | 350 Pa | Verify this meets local wind-driven rain requirements for the project location |
Air Tightness | 4.5 m³/(m·h) | Confirm air-tightness class rating applicable to the target market standards |
Sound Insulation | 30 dB | Consider glass upgrades if higher acoustic performance is needed for the project |
Product Specifications
Specification | Details |
|---|---|
Product Name | 28 x 40 Casement Window |
Product Type | Cranked-out / hand-crank operated casement window |
Material | 6063-T5 aluminum profile |
Glass Type | Double tempered (5+27A+5 mm for WY-72/WY-100; 5+15A+5 mm for WY-86) |
Glass Thickness | 5 mm + airspace + 5 mm (27A or 15A spacer) |
Frame Option | 72 mm / 86 mm / 100 mm frame depth |
Hardware | American/Australian hand crank with multi-point or single-point lock |
Opening Style | Flat opening / hanging up, hand-crank operation |
Size Range | Nominal 711 x 1016 mm (~0.72 m²); panel range W450-800 × H600-1500 mm |
Application | Residential and commercial buildings |
Customization | Size, color, glass, hardware, and style combinations available |
Notes | Final specifications depend on selected series — confirm during quoting |
Advantages
Made-to-Size Production: Windows are produced to project dimensions rather than stock sizes, supporting architectural accuracy for B2B orders and procurement.
Series Flexibility: Three frame depth options with different glass packages let buyers match performance and cost to specific project needs.
Export Packaging: Wooden-frame packaging with PE film, pallet fixing, and air bags protects windows during sea freight shipping to overseas markets.
Manufacturing Capability: DERCHI operates a 70,000 m² facility with 600 employees and 100+ patents, supporting volume orders and custom project requirements.
Itemized Upgrades: A transparent price table for limiters, glass upgrades, and safety components helps buyers control project budgets and procurement costs.
Application Scenarios
Apartment: In compact urban apartments, this window fits kitchens and bathrooms where wall space is limited. The crank operation works above counters, and the outward swing avoids blocking interior walkways.
Home Office: Natural light and controlled ventilation help maintain comfort during work hours. The hand-crank mechanism allows partial opening for airflow without leaving the desk, keeping the workspace quiet.
Hotel: Hotels benefit from the 30 dB sound insulation and clean aluminum frame finish. The crank operation is intuitive for guests, and made-to-size production accommodates different room layouts and facade designs.
Office Building: For commercial facades, the 5 KPa wind resistance and EPDM sealing support consistent performance. Buyers should confirm local code compliance and whether fixed-plus-operable combinations suit the ventilation strategy.
Outdoor: When used in outdoor-facing enclosures or balconies, buyers should verify water tightness (350 Pa) against local wind-driven rain conditions. Surface finish and hardware corrosion resistance should also be confirmed for exposure levels.
Residential Building: The window serves bedrooms, living rooms, and stairwells in multi-unit residential projects. Multiple color options and style combinations allow architects to maintain facade consistency across different unit types.
Exterior: For exterior facade applications, buyers must confirm wind pressure ratings, water tightness, and surface finish durability against the project's climate zone. Installation details and sill specifications should be reviewed with the project team.
Villa: Villas often require custom window configurations — the stepped, hexagonal, and bay combination styles offer design flexibility. Buyers should confirm glass package and color selection to match the architectural theme.
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 28 x 40 casement window?
It is a made-to-size aluminum crank-out window (711 x 1016 mm nominal) from the DERCHI WY-72/86/100 series, featuring 6063-T5 frame, double tempered glass, and EPDM sealing for residential and commercial projects.
Where can this window be used?
It suits apartments, hotels, villas, office buildings, and residential buildings — particularly kitchens, bedrooms, living rooms, and stairwells where ventilation control and natural light are priorities.
Can the window be customized?
Yes — size, frame depth (72/86/100 mm), color, glass package, hardware, and style combinations are customizable. Buyers should provide drawings and confirm the selected series during quoting.
What information is needed for a quote?
Provide nominal size, frame depth preference, glass package, opening direction (left or right crank), color, screen type, project country, and local code requirements. CAD drawings or window schedules help ensure accurate pricing.
What is the delivery time?
Indicative lead time is 25–35 days, though final delivery depends on order volume and configuration. Buyers should confirm the timeline per order after drawings are finalized.
Do certifications like NFRC or CE apply to this window?
DERCHI cites global certifications generally, but applicability to specific WY-72/86/100 models must be verified. Buyers should request test reports for their target market before ordering.
Is the profile thickness 1.4 mm or 1.8 mm?
The 2026 catalog specifies 1.4 mm for WY-72/86/100, while an Alibaba listing references 1.8 mm. Buyers should confirm the applicable thickness for their selected series before production.
