Phenoic Pre-insulated Aluminum Duct

Comparison Dimension (Key Focus for Contractors)

Phenolic Pre-insulated Aluminum Duct

G.I. Ductwork (Galvanized Iron Duct)

Key Notes (Construction/Selection Reference)

Core Structure

Factory-prefabricated three-layer composite (aluminum inner layer + phenolic foam + aluminum outer layer) with integrated insulation

On-site fabricated galvanized iron duct (0.5-1.2mm galvanized iron sheet), requiring separate insulation cotton (glass wool/rock wool) wrapping later

Phenolic Aluminum Duct has no on-site fabrication link, while G.I. ductwork requires on-site plate cutting, seaming, and welding, with cumbersome processes.

Construction Efficiency

Extremely high: Ready to install after unpacking, simple splicing, 20-30m per 2-person team per day

Relatively low: On-site fabrication + insulation, only 8-12m per 2-person team per day

For projects with tight construction periods and high labor costs, Phenolic Aluminum Duct has obvious advantages, enabling early completion and payment collection.

Labor Cost

Low: No professional galvanized iron workers or insulation workers required; ordinary workers can construct after training, saving more than 50% of labor.

High: Professional galvanized iron workers are needed for duct fabrication, and additional insulation workers for insulation wrapping; labor cost is 2-3 times that of Phenolic Aluminum Duct.

For large-scale projects (such as shopping malls and office buildings), Phenolic Aluminum Duct can save tens of thousands of yuan in labor costs.

Weight (Handling/Hoisting)

Light (8-12 kg/㎡), can be handled manually without hoisting equipment

Heavy (25-35 kg/㎡, including insulation), requiring crane and scaffolding assistance, increasing hoisting costs

For high-altitude and narrow spaces (such as high-rise ceilings and equipment voids), Phenolic Aluminum Duct construction is safer and more convenient.

Thermal Insulation Performance

Excellent: Closed-cell phenolic foam with thermal conductivity of 0.022-0.026 W/(m·K), uniform insulation, no cold bridges or hollowing

Ordinary: Depends on insulation cotton wrapping quality, prone to poor wrapping, hollowing, and falling off, with thermal conductivity of 0.035-0.045 W/(m·K)

For projects with large cold/heat loads (such as cold storage and high-temperature workshops), Phenolic Aluminum Duct can reduce customer energy consumption and improve satisfaction.

Fire Performance

Excellent: Flame-retardant grade Class A/UL 94 V-0, non-combustible, self-extinguishing, no toxic smoke

Ordinary: The galvanized iron sheet itself is non-combustible, but the insulation cotton (glass wool/rock wool) is mostly Class B1, producing a large amount of smoke when burned

For projects with high fire protection requirements such as hospitals, schools, and shopping malls, Phenolic Aluminum Duct can directly pass fire acceptance without hidden dangers.

Corrosion Resistance/Moisture Resistance

Excellent: Aluminum sheet is corrosion-resistant, phenolic foam is water-proof, suitable for humid environments (swimming pools, kitchens, coastal buildings), no mold

Poor: Galvanized layer is easy to fall off and rust; insulation cotton becomes moldy and invalid after absorbing water, requiring regular derusting and insulation replacement

For projects in humid environments, G.I. ductwork is prone to rust and rework later, while Phenolic Aluminum Duct can reduce maintenance troubles.

Post-maintenance

Minimal: Only annual inspection of interface sealing is required; no insulation falling off or duct rusting, maintenance cost is almost negligible

Frequent: Regular inspection of insulation layer (repairing falling off and hollowing) and derusting and painting of ducts are required, with high annual maintenance cost

Contractors who value long-term reputation and do not want frequent callbacks should prioritize Phenolic Aluminum Duct.

Upfront Cost

Slightly higher: 15-20% higher than G.I. ductwork (including insulation) due to factory prefabrication and high-quality materials

Relatively low: Low material cost of galvanized iron sheet + insulation cotton, but high labor cost

G.I. ductwork is cheaper in the short term, but Phenolic Aluminum Duct is more cost-effective in the long run (including labor, maintenance, and energy consumption), and the price difference can be recovered in 2-3 years.

Acceptance Difficulty

Low: Factory prefabrication with precise dimensions, uniform insulation, and good sealing; fire protection and energy conservation acceptance can be passed at one time

High: On-site fabrication is prone to dimensional deviation, poor insulation, and air leakage, which may lead to rework due to failed acceptance

For projects with tight construction periods and strict acceptance requirements, Phenolic Aluminum Duct can avoid rework and construction period delays.

Applicable Scenarios

Commercial buildings, hospitals, high-end residences, cleanrooms, cold storage, swimming pools, coastal buildings, etc. (requiring high efficiency, safety, and low maintenance)

Ordinary residences, temporary buildings, low-budget projects, simple scenarios without moisture/high temperature/high fire protection requirements

Select the type according to customer budget and project requirements; prioritize Phenolic Aluminum Duct for high-end projects to improve project quality.