Next-Generation Pre-Insulated HVAC Composite Air Duct Solutions
Mak Tek Engineering supplies, designs, and installs high-performance Green Energy Pre-Insulated Composite Air Duct Systems (AERACORE) across Bangladesh. Engineered by Guangdong Green Energy Ventilation System Co., Ltd. (Holdings Group), this cutting-edge ventilation system replaces cumbersome, energy-inefficient traditional galvanized sheet iron ducts and hazardous glasswool insulation with a monolithic, factory-engineered composite panel structure.
Manufactured using an eco-friendly pure-water foamed polyurethane (PIR) closed-cell rigid matrix (ODP = 0, GWP = 0) and protected by high-strength embossed aluminum foil or double-sided pre-painted color steel facings, The system delivers superior thermal insulation, Class A fire safety, laboratory-verified 99% antibacterial protection, and exceptional airtightness. Whether deployed in critical pharmaceutical cleanrooms, hospital operating theatres, microelectronics fabs, or expansive commercial complexes, The system optimizes HVAC airflow efficiency, reduces thermal transmission losses by up to 20%, and slashes installation time in half.
Green Energy Composite Air Duct System — Turnkey Engineering Installation
Integrated lightweight pre-insulated PIR air distribution ductwork deployed in modern pharmaceutical and industrial cleanrooms.
1. Eight Core Performance Advantages (System Architecture)
Pre-insulated composite air ducts overcome the fundamental engineering limitations of traditional sheet metal ducts, such as excessive weight, joint air leakage, thermal condensation, microbial colonization, and fiberglass degradation. The system is engineered around eight core technological breakthroughs:
Eight Core Performance Dimensions of Composite Air Ducts
Comprehensive performance superiority: 8x Airtightness, 99% Antibacterial, Fire Resistant, Long Life, 1/6 Lightweight, 5x Corrosion Resistant, Modular Assembly, and Hygienic Cleaning.
Traditional sheet metal ducts experience 5% to 8% air leakage at joints. Green Energy modular continuous interlocking flanges keep leakage under 0.3%, virtually eliminating conditioned airflow loss and lowering fan motor power consumption.
The internal duct facing is factory-treated with a permanent nano-silver ion antibacterial protective barrier that continuously inhibits E. coli, S. aureus, mold, and airborne fungal reproduction for sterile indoor air quality (IAQ).
Exterior pure aluminum foil achieves non-combustible Class A; the thermoset PIR foam core achieves Class B1 flame-retardant (GB 8624 / EN 13501-1). It forms a dense carbonized shield under direct flame without melting or dripping toxic fumes.
High-density closed-cell PIR foam does not rot, settle, or absorb atmospheric moisture. Unlike fiberglass that degrades and sags within 8–10 years, The system ensures over 30 years of continuous, trouble-free thermal efficiency.
Weighing only 1.3 kg/m² (compared to 4.0 ~ 11.85 kg/m² for galvanized iron plus rockwool), The system reduces ceiling dead loads by over 80%, simplifies seismic bracing, and accelerates high-altitude overhead installation by 50%.
Impervious to high-humidity tropical conditions, acid condensation, industrial chemical vapors, and maritime coastal salt air, preventing premature rusting and oxidation common to metal ducting.
Integrated pre-insulated panels are CNC-cut and jointed with standardized h-type and F-type flanges. One-step installation eliminates secondary lagging and jacketing, cutting on-site installation time by 30% to 50%.
Ultra-smooth non-porous interior surfaces prevent dirt and microbiological residue from latching on. Easily cleaned using standard duct-cleaning brush robots or chemical sanitizing misting without damaging the insulation.
2. Standard & Nano-Silver Antibacterial Composite Duct Panels
Green Energy standard and antibacterial panels provide versatile solutions for commercial real estate and controlled healthcare environments. Both configurations utilize pure-water expanded PIR core materials with zero halogenated flame retardants and zero toxic blowing agents.
Standard Embossed & Nano-Silver Antibacterial Composite Duct Panels
Cross-sectional specifications for 4000mm × 1200mm pre-insulated panels with embossed foil or nano-silver ion antimicrobial barrier.
Standard Composite Duct Panel
- Outer / Inner Facing: Dual-sided high-tensile embossed aluminum foil with protective polymer lacquer
- Core Material: Water-foamed closed-cell rigid PIR foam ($48 \sim 52 ext{ kg/m}³$)
- Standard Size: $4000 ext{ mm (L)} imes 1200 ext{ mm (W)} imes 20 ext{ mm / }25 ext{ mm / }30 ext{ mm (T)}$
- Thermal Conductivity: $\le 0.022 ext{ W/m}\cdot ext{K}$ at $25^\circ ext{C}$
- Target Facilities: Commercial shopping malls, corporate office buildings, educational institutes, transit terminals, and hotels.
Nano-Silver Antibacterial Cleanroom Duct Panel
- Active Hygiene Layer: Continuous nano-silver ion antibacterial barrier bonded to inner foil surface
- Bacteriostatic Rate: $\ge 99.9\%$ inhibition against pathogenic bacteria and black mold spores
- Fiber-Free Airway: Zero particulate shedding; certified for ISO Class 1 through ISO Class 8 cleanrooms
- Standard Size: $4000 ext{ mm (L)} imes 1200 ext{ mm (W)} imes 20 ext{ mm / }25 ext{ mm (T)}$
- Target Facilities: Pharmaceutical WHO-GMP manufacturing plants, hospital operating theatres, ICU suites, biotechnology laboratories, and food & beverage plants.
3. High Anti-Corrosion Composite Duct Panels for Severe Environments
Industrial ventilation ducts in chemical synthesis units, electroplating plants, and effluent treatment facilities (ETP) face aggressive corrosive atmospheres containing acidic vapors, sulfur compounds, and alkaline moisture. High Anti-Corrosion Composite Panels are engineered specifically to resist severe chemical deterioration.
High Anti-Corrosion Composite Duct Panel Architecture
13-micron heavy-duty fluoropolymer protective lacquer on composite alloy foil facings for maximum chemical resistance.
Engineering Chemical Resistance Highlights:
- $13\,\mu ext{m}$ Protective Lacquer: Coated with an ultra-thick fluoropolymer chemical barrier that withstands continuous acidic mists ($H_2SO_4$, $HCl$, $HNO_3$) and corrosive alkalis ($NaOH$).
- Multi-Layer Composite Barrier: Laminated structure comprising fluorocarbon topcoat, epoxy primer, passivated alloy foil, and pure-water foamed PIR core.
- Salt Spray Endurance: Exceeds 1,000 hours of continuous neutral salt spray (NSS) testing with zero surface pitting, blistering, or delamination.
- Dimensions & Sizing: $4000 ext{ mm (L)} imes 1200 ext{ mm (W)} imes 20 ext{ mm / }25 ext{ mm (T)}$.
- Industrial Applications in Bangladesh: Chemical processing plants, electroplating and metal surface treatment workshops, textile dyeing and finishing mills, leather processing tanneries, municipal/industrial ETP & STP pump rooms, and coastal industrial zones.
4. Double-Sided Color Steel Heavy-Duty Composite Duct Panels
For applications where ducts are exposed to mechanical collision risks, high static air pressures (> 1,500 Pa), or where ultra-rigid structural ductwork is specified, The system provides double-sided pre-painted galvanized steel (PPGI) composite panels.
Double-Sided Color Steel Composite Duct Panel
High-strength PPGI steel facings laminated with closed-cell PIR core for heavy-duty industrial and plant-room HVAC lines.
Heavy-Duty Mechanical Characteristics:
- Dual-Sided Steel Skin: Pre-painted galvanized color steel facings on both the airway interior and outer exterior, providing exceptional puncture, impact, and abrasion resistance.
- Structural Rigidity: Extremely high flexural modulus prevents duct bulging or breathing under high positive or negative fan static pressures (tested up to 2,000 Pa).
- Panel Dimensions: $3000 ext{ mm (L)} imes 1200 ext{ mm (W)} imes 20 ext{ mm / }25 ext{ mm (T)}$.
- Non-Combustible Exterior: Steel surface provides high fire barrier integrity with zero flame penetration.
- Deployment Areas: Central chiller and boiler plant rooms, underground car parking exhaust, industrial main distribution headers, high-bay factory warehouses, and railway/subway ventilation shafts.
5. Comprehensive Technical Comparison: Green Energy vs Traditional Ducts
A rigorous engineering comparison between Pre-Insulated Composite Ducts and traditional galvanized sheet metal ducts (insulated with glasswool or rockwool) demonstrates clear advantages in energy efficiency, weight reduction, airtightness, and installation speed:
Technical Performance Comparison Chart: Green Energy vs Traditional Sheet Metal Ducts
Authoritative comparative metrics across thermal conductivity, weight, moisture absorption, air leakage, and lifecycle durability.
| Technical Parameter | Green Energy Green Energy Composite Duct | Traditional Galvanized Sheet Iron Duct |
|---|---|---|
| Material Weight | 1.3 kg/m² (Ultra-lightweight, 1/6 of metal duct) | 4.0 ~ 11.85 kg/m² (Extremely heavy, adds ceiling strain) |
| Thermal Conductivity (λ) | ≤ 0.022 W/(m·K) (Superior thermal barrier) | 0.034 ~ 0.038 W/(m·K) (Glasswool insulation degrades over time) |
| Water Absorption Rate | ≤ 0.83% (Closed-cell PIR resists moisture absorption) | 3% ~ 5% (Glasswool absorbs humidity, sags & loses R-value) |
| Air Leakage Rate | < 0.3% (Precision h/F flanges with airtight sealant) | 5% ~ 8% (Leaky lock seams, slip joints, and s-cleats) |
| Static Pressure Resistance | Up to 1,500 Pa (Without deformation or rupture) | 500 ~ 1,000 Pa (Prone to panel fluttering and popping noises) |
| HVAC Energy Savings | 15% ~ 20% Reduction in thermal transmission losses | Baseline baseline consumption; high standby losses |
| Fire Safety Classification | Class A Exterior / Class B1 Core (GB 8624 / EN 13501-1) | Metal is Class A, but secondary lagging adhesives are combustible |
| Antibacterial Efficacy | ≥ 99% (Active nano-silver ion antibacterial coating) | None (Vulnerable to mold, fungal spores, and bacterial growth) |
| Installation Methodology | 1-Step Integrated Modular Assembly (Pre-insulated) | 2-Step Manual Process (Sheet metal fab + glasswool wrapping) |
| Installation Speed | 30% ~ 50% Faster on-site execution schedule | Slow, labor-intensive manual lagging and taping |
| Environmental & Health | Pure-Water Foamed, Zero CFC/HCFC, Zero Fibers | Airborne fiberglass particulate shedding hazardous to workers |
| Design Service Life | 30+ Years (Non-degrading thermoset closed-cell PIR) | 10 ~ 15 Years (Rusting, seam loosening, insulation waterlogging) |
6. Standard Joinery & Modular Fabrication Methodologies
Pre-insulated composite air ducts are manufactured into rigid, aerodynamic air distribution ductwork through precision CNC grooving or specialized manual V-cutting tooling. Standardized connection joinery ensures structural integrity, low aerodynamic resistance, and zero leakage.
Standardized Modular Joinery Configurations for Green Energy Composite Ducts
Precision fabricated configurations: Straight Run, 90° Elbow, Reducer Transition, Tee Branch, Y-Diverter, and Four-Way Cross.
Panels are cut to size, folded via 90° V-grooves, sealed along corners with structural polymer adhesive, and interconnected using standardized extruded aluminum or PVC h-flanges.
Segmented 90° and 45° curved or mitred bends with internal aluminum turning vanes to maintain laminar airflow, prevent vortex formation, and eliminate dynamic pressure loss.
Concentric or eccentric dimensional transitions engineered to adjust duct cross-sectional area smoothly while preventing air velocity surges and acoustic turbulence.
90° take-off junctions equipped with internal airflow splitters and corner support angles to distribute primary air into branch zones without backpressure.
45° symmetrical bifurcated fittings designed for high-velocity trunk lines, dividing air volume evenly into dual zones with minimum static pressure drop.
Heavy-duty central distribution manifold with internal reinforcement tie rods, facilitating multi-directional supply and return air routing in central plant areas.
7. Complete Modular Flange Profiles, Hardware & Installation Accessories
Mak Tek Engineering provides a comprehensive suite of factory-matched structural flange profiles, internal reinforcement tubes, structural adhesives, and specialized fabrication tools for Composite duct installations across Bangladesh:
Flange Profiles, Reinforcement Hardware & Assembly Components
Integrated system hardware: Aluminum/PVC Flanges, Reinforcement Discs, Internal Support Tubes, Corner Angles, and Dedicated Adhesives.
Flange Profiles & Framing Hardware
- Aluminum Flat Interface Flanges: Precision extruded 6063-T5 aluminum interface profiles for heavy-duty connections and equipment collar mating.
- Aluminum & PVC h-Flanges: Standard connection profiles for modular linear straight duct jointing.
- Aluminum & PVC F-Flanges: Perimeter wall penetration and terminal air grille/damper attachment frames.
- PVC Invisible Flat & Corner Flanges: Lightweight snap-fit joint splines providing clean, concealed exterior joints.
- Galvanized Corner Brackets: 90° heavy-duty stamped steel corner angles providing structural rigidity at flange perimeters.
Internal Reinforcement & Sealing Chemicals
- Internal Support Tubes (SUS304 / Aluminum): Circular and square hollow section internal struts preventing duct deflection under high static pressure (> 1,000 Pa).
- Galvanized Reinforcement Discs: Heavy-gauge load distribution spreader washers installed with inner support tubes.
- Specialized Polymer Panel Adhesive: High-tack polyurethane bonding agent formulated for permanent panel groove lamination.
- Airtight Flange Sealant: Neutral elastic silicone sealant ensuring zero air leakage along flange junctions.
- Reinforced Aluminum Foil Scrim Tape: High-adhesion vapor-barrier tape for external seam finishing.
Turn-Key Engineering, Sizing & Installation Services
Mak Tek Engineering provides complete end-to-end electro-mechanical support for pre-insulated composite air duct projects throughout Bangladesh, including:
- HVAC Duct Sizing & Static Regain Calculations: Full computerized CFM, friction rate, and static pressure loss calculations per ASHRAE and SMACNA standards.
- Cleanroom & Industrial Duct Fabrication: Factory-controlled automated CNC cutting, grooving, and pre-assembly at our central workshop & fabrication yard in Narayanganj.
- On-Site Assembly & Overhead Hoisting: Experienced HVAC installation crews trained in modular composite duct erection, vibration-isolated threaded rod hanger installation, and precision sealing.
- Air Leakage & Pressure Testing: Certified SMACNA air duct leakage testing (ADLT) and airflow balancing (TAB) with calibrated anemometers and digital micromanometers.
- Consultation & Specification Support: Assisting MEP consulting engineers, cleanroom architects, and facility managers with technical specifications, BOQs, and BIM Revit models.
