Manual Bending Machine For Pre-insulated Elbow air Duct

Manual Bending Machine For Pre-insulated Elbow air Duct

Manual bending machine for pre-insulated elbow air ducts is a specialized tool designed to shape pre-insulated duct panels into precise elbow fittings while preserving the integrity of the insulation layer.    These machines are widely used in HVAC installations where energy efficiency and thermal performance are critical.

UNT Manual Bending Machine for Pre-insulated Air Ducts is an essential tool in the HVAC system installation, designed to bend and shape PIR Duct Panel used in HVAC ductwork.  It is used to make radius elbow duct and fittings.  Capable of bending various sizes and types of Pre-insulated Duct Panels.

Key Components & Design

（1.）Adjustable Bending Mechanism
The machine typically features a positioning block and bending levers that allow operators to control the bending angle (e.g., 45° or 90°) with precision .

These components apply gradual pressure to avoid damaging the insulation, which is often made of polyurethane (PU), polyisocyanurate (PIR), or phenolic foam sandwiched between aluminum foil layers .

（2.）Durable Construction
Built with steel frames and reinforced rollers, these machines withstand repetitive use and heavy-duty applications.   Some models include rubber-coated dies to grip the duct panel without scratching the aluminum facing .

（3.）Portability
Manual machines are lightweight (e.g., ~38 kg) and compact (e.g., 145 × 30 × 75 cm), making them suitable for on-site fabrication in confined spaces .

Working Principle

（1.）Step-by-Step Bending Process
Alignment: The pre-insulated panel is clamped onto the machine’s base, aligned with the desired bending radius template.

Gradual Pressure: The operator uses a lever or handle to apply controlled force, bending the panel around a curved die.   This process prevents cracking or delamination of the insulation .

Multi-Angle Forming: For complex elbows, the machine may use a two-step method: first forming a single angle with bending levers, then using positioning rods to set the remaining angles accurately .

（2.）Material Compatibility
The machines are optimized for pre-insulated panels with thicknesses ranging from 12.5 mm to 50 mm.   They handle materials like PU/PIR foam (common in commercial HVAC) and phenolic foam (suitable for fire-resistant applications) .

Applications

（1.）HVAC Systems
Ideal for creating elbows in pre-insulated ductwork for commercial buildings, hotels, and hospitals.   These fittings minimize heat loss, condensation, and airflow turbulence .

（2.）Industrial Ventilation
Used in factories and warehouses to fabricate ducts for exhaust systems, ensuring compliance with safety and energy efficiency regulations .

（3.）On-Site Fabrication
Portable machines enable quick adjustments to ductwork layouts during installation, reducing material waste and labor costs .

Packing

Manual Bending Machine for pre-insulated duct board is packed by plastic film or wooden carton. Packing size: 145×30×75 cm, and the weight is about 38 kgs.