Architectural-grade certifiedfenestration solutions engineered for extreme weather resilience and thermal efficiency.
OUNA NFRC Certification Balcony Outdoor Balcony Patio Double Glass Hurricane Impact Water Sound Proof Aluminum Sliding Doors
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OUNA Thermal Break Aluminum Louver Blade Design Reduces Solar Heat Gain Improves Building Energy Efficiency
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OUNA China High Quality Modern Design Aluminum Casement Window Thermal Break Hurricane Impact Proof Double Glazed Tempered Glass
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OUNA Hot Sale Energy Saving Customized Double Layered Tempered Glass Thermal Break Aluminum Lift Sliding Villa Bedroom Door
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OUNA Modern Design Bi-Fold Soundproof Folding Door Exterior Accordion Foldable Glass Door Finished Surface for Villas
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OUNA Spain Project Engineering Ce Certification Sdl French Door Tempered Glass Aluminum Window Heat Insulation Other Windows
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OUNA Aluminum French Doors with Double Swing System for Villa Patio Black Frame and Tempered Glass for Secure Smooth Operation
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OUNA Home Office Reading Nook Skylight Reduces Eye Strain with Balanced Natural Light Quiet Electric Operation for Focus
View Product DetailsThe global architectural envelope industry is undergoing a paradigm shift driven by stringent energy codes, decarbonization targets, and an increased frequency of extreme weather events. As commercial developers, facade engineers, and residential renovation contractors seek high-performance secondary envelope systems, aluminum storm windows have emerged as a critical technical component for retrofitting existing structures and optimizing new builds.
Historically viewed as simple secondary barriers, contemporary high-spec aluminum storm windows feature polyamide thermal breaks, multi-cavity extrusion geometry, structural Low-E insulating glass units (IGUs), and high-velocity hurricane-impact resistance. China has solidified its position as the premier manufacturing epicenter for these engineered fenestration systems. By pairing vertically integrated aluminum profile processing with advanced automation, top-tier Chinese manufacturers offer uncompromised structural performance at highly optimized capital expenditure (CapEx) metrics.
Modern global energy policies—such as the European Union’s Energy Performance of Buildings Directive (EPBD) and North American IECC codes—demand U-factors as low as 0.20 Btu/h·ft²·°F (approx. 1.14 W/m²K). Specifying high-grade aluminum storm windows from leading Chinese suppliers allows architectural specifiers to reduce overall thermal bridging, improve sound attenuation by up to 45 dB, and meet structural wind load pressures exceeding 5000 Pa without requiring the complete removal of prime window assets.
Engineering robust aluminum storm windows requires a detailed understanding of metallurgy, glass chemistry, fluid dynamics, and thermodynamics. Top Chinese manufacturers leverage automated extrusion lines utilizing 6063-T5 and 6063-T6 architectural aluminum alloys to ensure structural deflection resistance while maintaining light profile weights.
Traditional non-thermal aluminum frames suffer from high thermal conductivity (k ≈ 160 W/m·K). Leading manufacturers integrate techno-form PA66 GF25 (25% fiberglass reinforced polyamide) thermal barrier strips. This creates an isolated multi-chamber thermal break, dropping frame conductivity to under 2.5 W/m·K, eliminating interior condensation during extreme winter differentials.
For High-Velocity Hurricane Zones (HVHZ), profiles are engineered with internal steel reinforce bars and paired with SGP (SentryGlas® Interlayer) or PVB laminated impact glass. Capable of passing ASTM E1886/E1996 Large Missile Impact testing and AS2047 cyclic wind pressure evaluations, these windows absorb kinetic forces from severe storms.
By creating a dead-air space between the primary prime window and the secondary aluminum storm barrier, sound energy transmission is disrupted. Combined with EPDM (Ethylene Propylene Diene Monomer) continuous weather-stripping gaskets, atmospheric noise pollution (STC ratings up to 48) is dramatically suppressed.
To resist harsh coastal marine environments and industrial atmospheric conditions, Chinese suppliers employ three primary surface treatment methodologies:
1. Fluorocarbon PVDF Powder Coating: Utilizing 70% Kynar 500 resin coatings to meet AAMA 2605 specifications, guaranteeing color retention and chalking resistance for over 20 years under intense UV exposure.
2. Anodizing (Class I & II): Electrochemical passivation forming an integral aluminum oxide layer (15–25 microns thick), delivering superior scratch resistance and metallic aesthetic texture.
3. Architectural Wood Grain Transfer: Vacuum heat-transfer technology reproducing natural timber textures over durable, fireproof aluminum substrates, perfect for luxury residential applications.
Aluminum storm windows engineered by leading Chinese suppliers are adaptable to diverse climatic zones and building archetypes across North America, Europe, Australia, and South America.
In regions impacted by tropical cyclones, aluminum storm windows act as primary structural shields. Heavy-duty extrusions with stainless steel multi-point locking hardware ensure zero structural failure under negative wind pressure loads up to 6000 Pa, safeguarding structural envelope integrity.
In cold climate zones, thermal loss through old prime windows accounts for up to 30% of building heating load. Retrofitting high-efficiency storm windows with Low-E double glazing reduces the thermal envelope U-factor, drastically suppressing heating operational costs and preventing frost accumulation.
Replacing curtain wall windows in occupied commercial skyscrapers is cost-prohibitive. Interior-mounted aluminum storm window retrofits provide an economical path to lower HVAC consumption and earn LEED/BREEAM certifications with zero disruption to tenants.
Registered in 2018, Hangzhou Velox Architectural Glass & Window Co., Ltd. stands at the forefront of China's high-precision architectural aluminum manufacturing sector. Spanning an expansive manufacturing area of 22,000 square meters, Velox leverages 9 years of deep industry technical knowledge and 6 years of dedicated international export operations, generating an annual export revenue reaching $18 million.
Velox products are widely distributed throughout Southeast Asia, Oceania, and South America, serving commercial project contractors, facade engineering consultancies, interior design firms, and regional window wholesalers. The company's competitive advantage lies in its robust supply network backed by 480 upstream supply chain partners, enabling seamless access to raw aluminum billets, high-purity glass, specialty EPDM seals, and premium international hardware suites (e.g., Siegenia, Hoppe, Roto).
Our core R&D unit consists of 32 specialized structural and mechanical engineers who successfully developed and released 28 new energy-efficient window models last year alone. To ensure absolute compliance with global standards, our dedicated team of 25 QC professionals strictly executes ISO-certified batch sampling, coating thickness testing, and hardware endurance evaluations across every production shift.
Rigorous multi-stage fabrication and metrology protocols ensuring precision engineering down to sub-millimeter tolerances.
To back our engineering claims with empirical proof, Velox operates an in-house ISO/IEC 17025 accredited quality testing lab equipped with high-precision analytical instruments:
Navigating global building trade codes requires comprehensive international certification. Products manufactured by Hangzhou Velox strictly conform to major worldwide standards:
NFRC (National Fenestration Rating Council): Certified thermal performance testing validating U-factor, Solar Heat Gain Coefficient (SHGC), and Visible Transmittance (VT).
AS2047 & AS1288 (Australian Standards): Rigorous deflection, water penetration resistance (up to 450 Pa), air infiltration, and ultimate strength compliance for Oceania markets.
CE Marking (EN 14351-1): Full compliance with European Union health, safety, and environmental protection standards.
ISO 9001:2015: Total Quality Management system covering raw material procurement, process control, final assembly, and packaging security.
Velox offers flexible OEM and ODM services tailor-made for international distributors and large-scale architectural projects. Customization vectors include:
Clear technical insights helping developers, architects, and procurement managers make informed sourcing decisions.
Aluminum storm windows are secondary fenestration units installed over existing (or primary) windows. They provide an economical, non-invasive barrier that dramatically upgrades thermal insulation, air tightness, and acoustic performance without the high cost and structural disturbance of removing existing window frames.
Chinese suppliers benefit from vertically integrated industrial clusters, efficient automated extrusion and CNC processing, and lower localized supply chain overheads. Hangzhou Velox's 480 upstream partners enable direct raw material procurement, passing scale efficiency directly to global B2B clients.
We provide comprehensive NFRC, AS2047, and CE test reports covering air infiltration (ASTM E283), water resistance (ASTM E331), structural wind pressure (ASTM E330), and large missile impact testing (ASTM E1886/E1996) upon request.
Standard lead time for profile extrusion, powder coating, IGU assembly, and rigorous QC testing ranges from 25 to 35 calendar days following shop drawing approval and deposit confirmation.
All finished units undergo protective film covering, corner guard insertion, heat-shrink synthetic packaging, and are anchored inside custom fumigated plywood crates or A-frame steel racks designed to absorb dynamic transit forces during ocean shipment.
Explore our extended catalog of advanced aluminum architectural fenestration solutions.
Aluminum Exterior Louver Sun Shade for Windows and Balcony Adjustable Blades for Sun Control and Air Flow Custom Size
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OUNA Wholesale Price Modern Waterproof 45mm Thick Aluminum Wooden Door Finished Surface Manual Opening for Home
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OUNA NFRC Hurricane Impact AS2047 Hotel Aluminum Exterior Balcony Patio Soundproof Glass Garden Aluminum Bifold Folding Doors
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OUNA Small Space Solution Aluminum Vertical Folding Window for Apartment Balcony Maximizes Usable Area and Brings in Breeze
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OUNA AS2047 CE Customized Waterproof Aluminum Louver Frame Sunshade Resistant Blinds Shutters Motorized or Manual Knob Operation
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OUNA Hurricane Proof Outdoor Double Tempered Glass Sliding Windows French Style Apartment Aluminum Window
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OUNA Aluminum Privacy Shutters for Indoor and Outdoor Use Perfect for Bathroom Bedroom and Garden Fence Durable Powder Coated
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OUNA Curtain Wall System Cost Per Square Meter Detailed for Budget Planning Aluminum and Tempered Glass Building Facade
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Velox Window & Glazing