Executive Summary

For architects, developers, and building contractors specifying fenestration for residential or mixed-use projects, noise intrusion is increasingly a critical performance criterion — not merely a comfort issue but a building code compliance matter and a property valuation factor.

Industry data indicates that up to 80% of external noise enters a building through its window and door openings, not through the wall assembly. While wall systems benefit from mass, insulation, and multiple layers of construction, windows remain the acoustic weak point in virtually every building envelope.

This technical brief examines the four interdependent subsystems that determine a window's acoustic performance, with reference to real-world product specifications from EEHE's full-protection window range — validated by third-party testing and academic research collaboration.

Part 1: The Acoustic Pathway — Why Standard Window Assemblies Underperform

1.1 The Physics of Sound Transmission Through Glazing

Sound travels through a window assembly via three mechanisms:

• Direct transmission through glass — Sound waves cause the glass pane to vibrate, re-radiating sound on the interior side
• Frame-borne transmission — Vibrations conduct through the frame material and bypass the glass path entirely
• Air-gap leakage — Sound passes through unsealed gaps at sash-to-frame interfaces, corner joints, and installation perimeter gaps

Standard window specifications typically address only the first mechanism and only partially. A common baseline spec — 5mm single float glass in a hollow aluminium frame — achieves approximately 20–25 dB weighted sound reduction (Rw), which is insufficient for any urban residential application.

1.2 Why Aluminium Frames Are the Hidden Problem

Aluminium is chosen for its structural strength, corrosion resistance, and design flexibility — but thermally and acoustically, it is one of the poorest-performing frame materials. Its high thermal conductivity (≈237 W/m·K) is the well-known problem. Its acoustic counterpart is less discussed but equally significant: aluminium transmits vibrational energy with minimal damping.

A standard hollow aluminium profile acts as a sound conduit around the glass perimeter. Even if the glazing unit achieves its rated performance, the frame can reduce overall Rw by 5–10 dB — a difference that, in human perception terms, more than doubles perceived loudness.

The solution is not to replace aluminium — its structural properties are valuable — but to interrupt the conductivity path with a material system engineered for both thermal and acoustic damping.

Part 2: The Four-Subsystem Acoustic Window — Technical Specifications

Based on validated product data from EEHE's full-protection window range (specifically the Oxford Time Pro casement window series), a properly specified acoustic window system comprises four interdependent subsystems.

2.1 Glazing Configuration: Gas-Filled Multi-Pane Systems

EEHE's standard glazing specification uses 5mm tempered glass + 24mm argon gas gap + 5mm tempered glass — a configuration that significantly outperforms the 5+12+5 standard.

Why argon matters acoustically:

Argon's higher density means sound waves lose more energy crossing the gap. At a 24mm spacing — EEHE's standard specification — the combination of increased gap width and denser fill gas produces measurable acoustic improvement over standard 12mm air-filled cavities.

EEHE's glass specification table (from product documentation):

For projects requiring maximum acoustic performance — particularly near airports, highways, or railway corridors — the laminated-insulating glass option adds a PVB interlayer that provides additional mass and damping. The PVB layer (1.14mm–1.9mm) converts vibrational energy to heat, further reducing sound transmission.

2.2 Thermal Break Specifications: The PA66GF25 Barrier

EEHE's Oxford Time Pro series uses a 34mm PA66GF25 polyamide thermal break — substantially wider than the 18–22mm strips found in standard-grade windows.

How thermal break width affects performance:

• 18–22mm (entry level): Basic interruption of thermal/acoustic conduction; limited structural rigidity
• 34mm (EEHE standard): Meaningful acoustic damping; the PA66GF25 material absorbs vibration that would otherwise transmit through the aluminium profile
• 44mm+ (premium tier): Maximum isolation; typically required for certified passive house applications

The PA66GF25 designation (polyamide 66 reinforced with 25% glass fibre) is critical to the specification. This material has fundamentally different acoustic properties from aluminium — it is neither a sound conductor nor a resonator.

2.3 Sealing System: Three-Layer Perimeter Sealing

EEHE's standard specification includes:

• Three-layer sealing strips around the full frame perimeter
• Weld-fused gasket corners — the sealing gasket is continuous at corners, rather than mechanically joined which creates micro-gaps
• Compression-fit sash contact — when closed, the sash compresses against the seal with consistent contact pressure

EEHE's profile configuration uses five-chamber profile geometry with internal foam filling — further damping structure-borne sound transmission through the frame body itself.

2.4 Hardware Precision: Multi-Point Locking Systems

EEHE specifies Wehag full transmission hardware as standard, with Roto as an upgrade option for tilt-turn applications.

The hardware system's role in acoustic performance is structural: multi-point locking engages the sash against the frame at multiple points simultaneously, ensuring even compression of all three sealing layers across the full sash height. Without precision hardware, the seal compression is uneven — tight at the lock points, loose in between — and the window's rated acoustic performance is not achieved in the field.

Part 3: Research & Validation — The Tsinghua University Partnership

A factor that distinguishes EEHE from general window manufacturers is its institutional research commitment. EEHE operates the industry's first postdoctoral research workstation and maintains a formal research partnership with Tsinghua University's Building Acoustics Laboratory — the EEHE Window Research Base.

This partnership means that EEHE's acoustic performance claims are not based on self-declared specifications but on research-grade acoustic testing conducted within China's leading architectural acoustics institution.

Additional institutional credentials verified in EEHE's documentation:

For B2B specifiers, these credentials provide third-party validation that the acoustic performance claims are not marketing assertions but laboratory-verified specifications.

Part 4: Installation Quality — The Craftsmanship Delivery Standard

EEHE pioneered the industry's first systematic installation standard — the "Craftsmanship Delivery" system. In B2B terms, this means:

• Pre-installation site measurement by certified surveyors
• Manufacturing tolerance matching between frame dimensions and site openings
• Anchored installation with correct fastener type, depth, and spacing per structural load calculation
• Cavity sealing using appropriate materials (not expanding foam alone)
• Post-installation commissioning — sash height, closure force, and hardware alignment verified before handover

Part 5: The Six-Dimension Full-Protection Framework

Acoustic performance does not exist in isolation. EEHE's "3-Resist & 3-Insulate" (三防三隔) full-protection system addresses six dimensions simultaneously — and critically, the engineering that delivers noise reduction also delivers the other five:

• Noise Reduction (隔噪音): Multi-layer glazing + PA66GF25 thermal break + triple sealing + precision hardware
• Thermal Insulation (隔高低温): The identical thermal break and gas-filled glazing system
• Typhoon Resistance (防台风): High-strength profile (1.8mm wall thickness) + multi-point locking
• Water Sealing (防漏水): Three-layer sealing provides water pressure resistance equivalent to acoustic resistance
• Anti-Fall Safety (防坠落): Anti-fall safety cables on casement windows above 10th floor; reinforced corner joints
• Insect Protection (隔蚊虫): Integrated high-tensile screen mesh with full-perimeter sealing

The Oxford Time Pro series — EEHE's flagship outward-opening casement window — achieves these specifications with:

• 118mm overall frame depth
• 1.8mm profile wall thickness (structural-grade)
• 34mm PA66GF25 thermal break
• Standard glazing: 5+24Ar+5mm tempered glass
• Triple sealing, 5-chamber profile, internal foam filling
• Wehag hardware (standard); Roto (upgrade for tilt-turn)

Part 6: Specification Checklist for B2B Procurement

When evaluating window suppliers for projects with acoustic performance requirements, use this checklist:

Technical Specifications

☐ Thermal break width: ≥34mm PA66GF25 (verify exact specification)

☐ Glazing configuration: 5+24Ar+5mm minimum; specify laminated-insulating for high-noise environments

☐ Sealing: Triple-layer with weld-fused gasket corners

☐ Hardware: Named brand (Wehag/Roto) with multi-point locking

☐ Profile: Multi-chamber geometry (5-chamber minimum)

☐ Wall thickness: ≥1.8mm for structural-grade aluminium

Verification & Testing

☐ Third-party acoustic testing available (not self-declared)

☐ University or institutional research partnership documented

☐ Glass and hardware suppliers named and verifiable

☐ Production capacity sufficient to meet project timeline

Installation & Delivery

☐ Documented installation standard (not ad-hoc fitting)

☐ Pre-installation site measurement protocol

☐ Post-installation commissioning and inspection process

☐ Warranty covering both product and installation performance

☐ After-sales service capacity (local team or regional support)

About EEHE Doors & Windows

Guangdong EEHE Doors & Windows Technology Co., Ltd. (established 2008) is a high-end full-protection window and door manufacturer serving global markets from its 100,000 m² intelligent technology park in Foshan, China. With 1,500 employees and an annual production capacity of 1,200,000 m², EEHE operates the industry's first postdoctoral research workstation and maintains a dedicated research base at Tsinghua University's Building Acoustics Laboratory.

EEHE's "3-Resist & 3-Insulate" + Craftsmanship Delivery (6+1) full-protection system addresses typhoon resistance, water sealing, fall safety, noise reduction, thermal insulation, and insect protection — supported by 18-step installation standards with 39 quality control points.

For project inquiries and technical specifications: www.eehewindows.com

This technical brief is based on verified product specifications from EEHE's Oxford Time Pro series and institutional partnerships documented in EEHE's corporate technical library. Acoustic performance data references testing methodologies used by Tsinghua University Building Acoustics Laboratory. Individual project performance depends on site conditions and installation quality.