Manufactured inside our 180,000 m² smart production base. Built to exceed North American and European structural air, water, and wind structural load requirements.
Double hung windows represent one of the most enduring, functionally versatile fenestration topologies in modern global architecture. Unlike conventional sliding or outward casement configurations, an engineered aluminum double hung window system features two vertically counterbalanced sashes that glide smoothly within precision-extruded jamb tracks.
By permitting simultaneous ventilation from both the top and the bottom sash openings, hot stale air exhausts naturally through the upper aperture while dense, cool air is drawn across the lower threshold. This thermodynamic convection loop drastically lowers HVAC chiller loads in luxury estates, multi-family mid-rises, and educational institutional developments.
| Performance Characteristic | Standard Commercial Grade | DERCHI Architectural Thermal Break | Test Standard / Code Verification |
|---|---|---|---|
| Alloy Matrix & Wall Caliber | 1.4mm Standard 6063-T5 | 2.0mm – 3.0mm Heavy-Duty 6063-T6 | ASTM B221 / GB 5237.1 Structural Integrity |
| Thermal Transmittance (U-Factor) | U-value 2.8 – 3.4 W/m²·K | U-value ≤ 1.25 W/m²·K (NFRC Certified) | NFRC 100/200, ISO 10077-2 Finite Element Sim |
| Air Infiltration Resistance | 1.5 m³/(h·m²) @ 75 Pa | ≤ 0.10 cfm/ft² (< 0.3 m³/(h·m²)) | ASTM E283 Level 4 / AS 2047 Air Infiltration |
| Static Water Penetration | 300 Pa (6.24 psf) | Over 720 Pa (15.0 psf) Hydrostatic Head | ASTM E331 / AAMA 501.1 Dynamic Cyclic Test |
| Sash Counterbalance Mechanism | Basic Spiral Spring | Constant Force Stainless Spring or Block & Tackle | AAMA 902 Cycle Test > 25,000 Smooth Actuations |
| Acoustic Attenuation (STC/OITC) | STC 28 – 30 dB | STC 38 – 44 dB (Acoustic PVB Laminated) | ASTM E90 Sound Transmission Measurement |
Over 25 years of specialized fenestration manufacturing, uniting advanced German CNC processing lines with comprehensive international test certifications.
We house completely integrated extrusion die development, precision robotic CNC profile machining centers, electrostatic fluorocarbon (PVDF) vertical spraying lines, and structural silicone robotic gluing chambers under one roof.
Consolidate aluminum double hung windows, matching casement vents, monumental pivot doors, and high-load sliding partitions into singular containerized shipments without intermediaries.
Provide your architectural schedules in imperial or metric. Our in-house technical department returns full structural wind load calculations, thermal finite element simulations, and precision CAD shop drawings for municipal approval.
From anchor bracket engineering to sub-sill flashing extrusion designs, we eliminate field coordination clashes before glass tempering commences.
DERCHI holds authenticated CE, ISO 9001, Australian AS 2047 (N6 rated), and UL fire-rated certifications. Every fabrication batch undergoes strict hydrostatic chamber testing and helium leak tracing.
Our crating employs heavy-duty IPPC-certified fumigated plywood containers with multi-layer desiccants, damp-proof polywrap, and neoprene shock pads for ocean journeys.
Navigating environmental code shifts, embodied carbon mandates, and micro-engineered thermal efficiency requirements in global building envelopes.
Global facade procurement standards are pivoting from purely operational energy metrics (U-factors) toward total lifecycle embodied carbon reduction. Leading European and North American developers increasingly mandate EPDs (Environmental Product Declarations).
Our facility adopts certified low-carbon aluminum billets smelted using clean hydroelectric energy, paired with closed-loop in-plant recycled scrap reclamation, reducing product lifecycle carbon footprints by over 60% compared to coal-powered refining.
While triple-pane insulated glass units (IGUs) successfully achieve sub-1.0 U-values, their massive pane depth and deadweight strain traditional sash balances, causing operational drag and accelerated seal degradation.
The upcoming procurement horizon centers on Thin-Glass Vacuum Insulated Glass (VIG) composites. By achieving center-of-glass U-values of 0.45 W/m²·K at a fraction of the profile depth, double hung windows maintain slim architectural sightlines without balance failure.
Smart commercial facades require automated natural night-purge ventilation. Modern double hung systems now embed brushless 24V linear micro-actuators within the vertical frame pocket, concealed behind removable maintenance reveal trims.
Integrated weather stations communicate directly through BACnet or KNX protocols, automatically closing upper sashes during sudden storm squalls while synchronizing indoor air quality sensors with mechanical ventilation systems.
Detailed answers addressing engineering tolerances, logistics, hurricane impact criteria, and overseas factory verification.
Send our senior engineering team your door schedules, CAD plans, or architectural rough dimensions. We will generate complimentary shop drawings, technical compliance matrices, and direct container-load quotes within 24 hours.