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Phenolic HVAC Duct Board

Phenolic HVAC duct board is a lightweight, pre-insulated panel system used to fabricate air distribution ducts, offering a high-performance alternative to traditional sheet metal or fiberglass ductwork.

These rigid boards consist of a closed-cell thermoset phenolic foam core, which provides the insulation, sandwiched between two outer facings, typically aluminum foil. The key advantage is the integration of the air passage, thermal insulation, and vapor barrier into a single, composite material.

Product Variants and Availability

While the core material is standard, we offer variations in facings and thicknesses to suit specific needs:

Facings: Standard is glass tissue backing reinforced aluminum foil, or Painted Steel Sheet .

Thickness: Common thicknesses include 20mm, 25mm, 30mm, 40mm, depending on the thermal and structural requirements.

Fire Ratings: ASTM E84 Class A, BS 476 Part 6&7 Class 0

Key Properties and Performance Dataof Phenolic HVAC Duct Board

To better understand the material, here is a breakdown of its core physical and fire performance characteristics:

Property	Typical Value / Rating	Benefit / Implication
Thermal Conductivity	0.025 W/mK	Highest thermal efficiency among common insulation materials; allows for thinner duct walls
Fire Safety	ASTM E84 Class A, BS 476 Part 6&7 Class 0	Material chars rather than melting, producing very low smoke and no flaming droplets
Core Structure	Closed-cell (>90%)	Extremely low water absorption and high resistance to moisture, mold, and fungus
Compressive Strength	>150 kPa (at 10% compression)	High rigidity and durable surface that resists damage during and after installation
Environmental Impact	Zero ODP, Low GWP (<5), CFC/HCFC free	Meets green building standards and does not contribute to ozone depletion

Comparison to Traditional Ducting

Switching from traditional materials to phenolic boards provides distinct advantages in several areas:

Weight & Structure:

It is up to 75% lighter than galvanized steel, which significantly reduces the structural load on a building.

Thermal Efficiency:

The superior insulation of phenolic foam eliminates the need for wrapping insulation around metal ducts, preventing thermal bridging and reducing energy loss.

Air Quality:

As a fiber-free material, it prevents loose fibers from entering the airstream, improving indoor air quality compared to fiberglass duct liners.

Installation Speed:

Fabricating ducts from these boards requires only hand tools and specialized adhesives, allowing for faster, cleaner installation compared to cutting, seaming, and insulating metal ducts.

Phenolic HVAC duct board is a technically advanced material that solves the major pain points of traditional HVAC systems: it offers top-tier fire safety, prevents moisture damage, saves energy through high thermal performance, and is much faster to install due to its lightweight, integrated design.

The fabrication process of Pre-insulated Phenolic HVAC Duct Board

Phenolic duct boards are typically fabricated on-site or in a workshop. The process involves marking the board, cutting V-grooves to create 90-degree bends, and applying adhesive to the beveled edges . The sections are then folded into shape (e.g., rectangular or L-shaped) and secured with tape, rivets, or specialized flange systems. Common connection methods include insert flanges or H-type flanges to join duct sections together.