Thanks to its excellent products and quality services, UNT Duct is one of the leading pre-insulated aluminum phenolic ductwork manufacturers and suppliers in China. Welcome to buy the high quality and customized products from our factory. We will offer you the best service and fast delivery.

What is Pre-insulated Aluminum Phenolic Ductwork?

Pre-insulated aluminum phenolic ductwork refers to a type of air duct used in HVAC systems that combines insulation and air conveyance in a single, lightweight panel. These "sandwich panels" typically consist of a rigid phenolic foam core bonded between two layers of aluminum foil.

Panel Structure: Silver Alu. / Phenolic Foam / Silver Alu. Foil
Foam Density: 50kg/cbm
Panel Dimension: 3950mm*1200mm*20mm
Alu. Foil: 0.06mm (Embossed)
Packing: 10 sheets/ Cardboard box

Container Loading:
40'HQ Container:
3950*1200*20mm, 10 sheets packed in one carton, total 660sheets
2900*1200*20mm, 10 sheets packed in one carton, total 880sheets
20'GP Container:

2900*1200*20mm, 10 sheets packed in one carton, total 400sheets.

Advantages of Pre-insulated Aluminum Phenolic Ductwork over Traditional G.I. Duct?

This system offers several practical benefits for construction projects:

Space-Saving:

Because the insulation is integral to the duct wall, the system can be installed flush to ceilings, saving valuable building height .

Faster Installation:

It combines the duct and insulation in one, eliminating the need for a separate lagging (insulation) process. Some manufacturers claim installation can be up to three times faster than traditional methods .

Lightweight:

The phenolic core makes the system significantly lighter-by as much as 75% compared to sheet metal-which eases handling and reduces structural requirements .

Energy Efficient:

The low thermal conductivity of the phenolic foam minimizes heat gain or loss, while the sealed system drastically cuts down on air leakage .

Clean Air Stream:

The internal aluminum surface is smooth, non-fibrous, and resistant to microbial growth, promoting good indoor air quality.

How to make Pre-insulated Aluminum Phenolic Ductwork

Unlike traditional sheet metal ducts that are built first and then insulated on-site, this system is fabricated directly from the panels:

Fabrication: Panels are scored with V-grooves on the inner surface, allowing them to be folded into the desired rectangular duct shape .

Sealing: Joints are sealed internally with silicone and externally with specialized aluminum tape to ensure the system is airtight and leak-free .

Connection: Duct sections are connected using engineered flange systems (like aluminum grip flanges or tiger clips) for a secure fit.