Zenit Window
Featured Engineering Portfolio & Architectural Fenestration
Explore our high-performance thermal break bi-fold systems, hurricane impact windows, and structural curtain walls manufactured for commercial and high-end residential projects.
OUNA Custom Powder Coated Aluminum Sliding Window with Double Tempered Glass for House Apartment and Building Projects
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OUNA Modern Flush Mount Sectional Garage Door Sleek Aluminum Design Automatic Opener for Contemporary House Custom Size
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OUNA Luxury Custom Aluminum Wood Interior Door for Villa and High End Residence Personalized Design Service Factory Price
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OUNA Heavy Duty Security Aluminum French Doors for Exterior Front Entry Reinforced Frame with Multi Point Locking System
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OUNA Electric Modern Single Aluminum Glass Garage Door Contemporary Home Use with Automatic Features Manufactured
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OUNA Waterproof and Ventilation Aluminum Roof Skylight for Attic and Loft Space Electric Opening System with Good Sealing
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OUNA Unitized Aluminum Curtain Wall System for High Rise Building Prefabricated for Fast Installation and Quality Control
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OUNA High Quality Custom Aluminum Exterior Entry Door American Style Security Soundproof Fireproof for Residential Villa Use
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Industrial Excellence & Manufacturing Capacity
Chengdu Zenit Window & Door Co., Ltd. represents the peak of Chinese structural fenestration engineering, combining advanced automated CNC machining with rigorous international quality standards.
Founded in 2015, Chengdu Zenit Window & Door Co., Ltd. operates a state-of-the-art 25,000-square-meter manufacturing facility. Backed by 11 years of deep industry expertise and 8 years of dedicated global trade experience, our enterprise achieves an annual export turnover exceeding $26 million USD. Our primary export footprint spans highly regulated tier-one markets including North America, Australia, and Western Europe, catering directly to residential home builders, architectural contractors, structural engineers, and major building material wholesalers.
25,000 m²
Production Plant
$26M+
Annual Export Turnover
42
R&D Engineers
35
Full-time QC Inspectors
600+
Supply Chain Partners
50+
New Systems / Year
Global Industry Trends in Architectural Folding Systems
The global architectural landscape for concertina (bi-fold) doors has shifted dramatically from simple room dividers to high-performance exterior structural building envelopes.
Biophilic & Panoramic Design
Modern luxury residential and commercial developments demand seamless integration between indoor spaces and outdoor environments. Concertina folding doors enable up to a 95% unobstructed opening width. Ultra-slim sightlines (down to 110mm stacked profile depth) maximize natural daylight harvest while delivering uncompromised structural integrity under high wind loads.
Extreme Thermal Efficiency
With worldwide energy codes tightening (such as ASHRAE 90.1, Title 24, and NCC Australia), concertina doors must overcome traditional thermal bridging vulnerabilities. Advanced polyamide thermal barrier strips (PA66 GF25) coupled with argon-filled triple glazing achieve U-factors below 1.2 W/m²K, making them compliant with Passive House design principles.
Structural Hardening & Resilience
Increasing climate variability has accelerated the demand for hurricane-impact certified concertina doors. Systems engineered with multi-point stainless steel locking bars, heavy-duty 316-grade bottom roller carriages, and laminated double-laminated toughened glass are now mandated across coastal high-velocity hurricane zones (HVHZ).
Global Sourcing Demand Matrix & Structural Compliance
Navigating complex international fenestration regulations requires audited production lines, standardized testing protocols, and complete material traceability.
| Target Region | Mandatory Standards | Key Performance Indicators Tested | Zenit Architectural Engineering Solution |
|---|---|---|---|
| North America (USA & Canada) | NFRC 100/200, ASTM E1300, AAMA/WDMA/CSA 101/I.S.2/A440, CSA A440.2 | U-Factor ≤ 0.28 BTU/h·ft²·°F, SHGC ≤ 0.22, Air Leakage < 0.1 cfm/ft², Wind Pressure up to 5000 Pa | Polyamide thermal breaks, Low-E triple pane insulated glass with argon, reinforced structural mullions, NFRC certified testing reports. |
| Australia & New Zealand | AS2047, AS1288, AS1170.2, BAL (Bushfire Attack Level) 29/40 | Deflection Ratio L/250, Water Penetration Resistance ≥ 450 Pa, Ultimate Limit State (ULS) structural load | Heavy-duty 6063-T6 aluminum extrusions, double EPDM perimeter weather gaskets, BAL-40 fire-resistant mesh integration. |
| Western Europe & UK | EN 14351-1, CE Marking, UKCA, BS 6375, Document L Compliance | Overall System U-value ≤ 1.2 W/m²K, Acoustic Reduction Rw ≥ 42 dB, Wind Load Resistance Class C5 | Multi-chamber warm-edge spacer bars, acoustic PVB laminated glass assemblies, Siegenia/Roto German hardware options. |
| Global Commercial / High-Rise | ISO 9001:2015, ISO 14001, Structural Silicone Glazing (SSG) Standards | Cyclic Water Tightness, Air Permeability Class 4, Corner Cleat Tensile Strength > 12 kN | Factory-assembled unitized concertina modules, 35-inspector QC protocol, CNC corner crimping with dual-component adhesive injection. |
Macro Architectural Engineering & Hardware Anatomy
Technical breakdown of Zenit's proprietary aluminium concertina systems engineered for longevity, smooth silent operation, and zero thermal bridging.
1. Extrusion Alloy & Anodizing Grade
All profiles utilize primary 6063-T5 / 6063-T6 architectural grade aluminum alloy with wall thickness ranging from 2.0mm to 3.0mm depending on load-bearing structural requirements. Surface treatment options include Fluorocarbon PVDF coating (AkzoNobel/PPG resin with 20-year warranty), anodizing up to 25 microns for marine environments, and realistic Italian heat-transfer woodgrain finishes.
2. Kinetic Hardware & Weight Load
Each door panel can support weights up to 150 kg (330 lbs) and panel heights up to 4.5 meters. Smooth kinetic transfer is achieved via bottom-loaded stainless steel SUS316 quadruple roller carriages operating on heavy-duty extruded aluminum tracks. Dual stainless steel guide pins prevent panel vibration under high gust loads.
3. Multi-Layer Sealing & Security
Continuous triple-gasket perimeter sealing using anti-aging EPDM (Ethylene Propylene Diene Monomer) vulcanized rubber ensures maximum air tightness. Integrated multi-point shoot-bolt locking hardware with anti-lift features provides RC2 / PAS 24 security certification to prevent forced entry.
Manufacturing Infrastructure & Rigorous QC Audit Pipeline
Quality control is managed by a team of 35 certified inspectors performing rigorous air permeability testing, water tightness checks, frame corner strength evaluations, and pre-shipment assembly debugging supported by 600+ supply chain partners.
Raw Material
Threading
Cutting 1
Cutting 2
CNC Machining 1
CNC Machining 2
Assembly 1
Assembly 2
Assembly 3
Assembly 4
Debugging
Warehouse
Strip Threading Machine
Cutting Machine
CNC Milling Machine
Assembly Line
QC
Debugging Rack
Technology Roadmap & Next-Gen Fenestration R&D
Driven by an active R&D division of 42 engineers, Zenit released over 50 new architectural window and door systems over the past year alone.
Smart Motorized Automation
Developing integrated concealed brushless servo motors with IoT smart home control (Zigbee/KNX protocols), enabling automated opening, anti-pinch safety sensors, and weather-triggered closure via rain and wind sensors.
Zero-Threshold Flush Track
Engineering invisible drainage track channels recessed flush with finished floor levels, featuring integrated concealed siphonic drainage to achieve ADA compliance without sacrificing water ingress resistance.
Aerogel Thermal Insulation
Incorporating nano-aerogel infused polyamide insulation strips to drop profile conductivity by an additional 35%, targeting U-factors below 0.8 W/m²K for extreme arctic and sub-zero climates.
Frequently Asked Technical & Procurement Questions
Detailed responses addressing engineering specifications, quality assurance, international certifications, and global B2B procurement terms.
Q1: How does Chengdu Zenit ensure air and water tightness in extreme weather zones?
We utilize a triple continuous EPDM gasket sealing strategy combined with precision CNC-machined corner cleats. Our systems undergo rigorous pressure chamber testing up to 5000 Pa wind load and 450 Pa static water penetration resistance, fulfilling AS2047, NFRC, and CE standards.
Q2: What aluminum alloy grade and surface treatments do you offer for coastal projects?
We standardly extrude 6063-T5/T6 high-tensile aluminum profiles. For coastal or high-salinity marine environments, we recommend our 25-micron marine-grade anodized finish or AkzoNobel Fluorocarbon PVDF coatings, which carry a certified 20-year anti-corrosion guarantee.
Q3: Can your concertina bi-fold doors accommodate hurricane impact requirements?
Yes. Our hurricane-proof series incorporates heavy-duty reinforced mullions, multi-point stainless steel security locks, and laminated safety glass (e.g., 6mm Tempered + 1.52pvb/SGP + 6mm Tempered). These pass large missile impact tests in accordance with ASTM E1886/E1996 protocols.
Q4: What is the typical lead time and MOQ for custom OEM/ODM commercial orders?
Our standard production lead time is 25 to 35 business days from CAD shop drawing sign-off. We support flexible MOQs for development projects, ranging from single villa custom orders to multi-container commercial project developments.
Q5: How are shipping damages prevented during long-distance ocean transport?
All finished frame assemblies and glass panels are wrapped in protective scratch-proof film, corner-shielded with high-density EPE foam, and fully enclosed in ISPM 15 compliant fumigation-free wooden crates with built-in moisture desiccant packs.
Additional Fenestration & Garage Door Solutions
Explore our full line of insulated garage doors, motorized louvers, bi-fold windows, and acoustic villa entrance systems.
OUNA Insulated Sandwich Panel Garage Door with PU Foam Core for Excellent Thermal and Acoustic Performance in All Climates
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OUNA Commercial Hurricane Impact Proof Windows NFRC AS2047 Modern Windows Foshan for Residential Project Aluminum Sliding Window
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OUNA Open Your Living Room to the Outdoors Aluminum Bi Fold Window Creates Wide Panoramic View for Entertainment and Relaxation
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OUNA Hurricane Proof Aluminum Exterior Door Balcony Patio Lowe Soundproof Glass Garden Aluminum Bifold Folding Door
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OUNA Luxury Aluminum Wood Interior Door for Hotel and Apartment Projects Custom Modern Classic Styles With Professional Oem
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OUNA Automatic Sectional Garage Doors Sandwich PU Railing with Aluminum Alloy Exterior for Warehouse Logistics
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OUNA Factory Supplier Exterior Sun Shade Window Shutter Motorized Louver Retractable Aluminum Louver
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OUNA Canada Project Villa Csa Hurricane Impact Proof Sliding Door Tempered Glass Aluminum Window Energy Efficient Other Windows
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Partner with China's Premier Aluminium Concertina Door Manufacturer
Whether you require NFRC-certified windows for North America, AS2047 compliant bi-folds for Australia, or customized structural curtain walls for commercial towers, Chengdu Zenit provides full engineering consulting, CAD shop drawings, and factory direct pricing.
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