Name: PIR Rectangular HVAC Ductwork Suppliers and Manufacturers - China Factory - UNT Duct
Brand: UNTDuct
SKU: 310119056

Thanks to its excellent products and quality services, UNT Duct is one of the leading pir rectangular hvac 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.

PIR Rectangular HVAC Ductwork

PIR Rectangular HVAC Ductwork deliver high-performance, environmentally sustainable air distribution for modern HVAC systems.

UNT PIR Rectangular HVAC Ductwork is composed of a 20mm thick rigid closed-cell PIR (Polyisocyanurate) foam core, laminated on both sides with 60/80 micron embossed aluminum foil. The surface aluminum foil is coated with a 2g/㎡ corrosion-resistant epoxy varnish, ensuring durability and protection in harsh environments.

Featuring low energy loss and eco-friendly formulation, they support energy conservation and meet green building requirements. Ideal for hotels, office complexes, airports, hospitals and other commercial and public buildings.

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Fire protection, durability and operation and maintenance costs of PIR Rectangular HVAC Ductwork

Fire Safety

PIR foam core: Class B1 flame retardant; aluminium foil surface: A1 non-combustible. Low smoke output and no dripping while burning. Complies with BS 476 and EN 13501, ideal for high fire-risk sites: data centres, subways and hospitals.

Long Service Life

Strong corrosion resistance. 95% strength retained after 720 hours acid/alkali immersion; no rust or pulverisation. Designed service life: 20 years. Galvanized steel ducts rust easily (5–8 years lifespan); phenolic ducts crack within 3–5 years.

Lower O&M Costs

Built-in moisture and corrosion resistance; no yearly rust removal and repainting required. Annual maintenance cost equals only 30% of traditional ducts. Low air leakage lessens load on main units, cutting fan loss and maintenance frequency. Total life-cycle costs are reduced by 30%–40%.

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Our Honor & certificate

Since its establishment in 2013, UNT has obtained 17 patents and earned numerous industry honors. We are also certified to the ISO 9001, ISO 14001, and ISO 45001 international management standards.

December 2020: Awarded the National High-Tech Enterprise Certificate and the Fujian Provincial High-Tech Enterprise Certificate

December 2023: Awarded the National High-Tech Enterprise Certificate and the Fujian Provincial High-Tech Enterprise Certificate

November 2024: Listed in the Fujian Provincial List of Specialized, Refined, Differentiated and Innovative Small and Medium-Sized Enterprises

UNTDuct ISO 9001 2015

UNTDuct ISO 14001 2015

UNTDuct ISO 45001 2018

Fire Safety GB 8624-2012

Fire Safety BS476 Part6&7

Fire Safety ASNZS 1530.3

Thermal Conductivity

PID Panel Physical Proper

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Why choose UNTDuct

UNT Pre-insulated Ductwork

Project Case of UNTDuct

Specification

Item	Unit	Specification
Standard Panel Size	mm	3950x1200x20
Alu. Foil Thickness	mm	0.06 or 0.08
Foam Density	kg/m³	50-55
Fire Safety (BS476Part 6&7)		Class 0
Thermal Conductivity	W/(m·K)	0.020
Compressive Strength	MPa	0.2
Bending Strength	MPa	2
Water Absorption	%	0.36
Dimension Change	%	0.3
Working Temperature	℃	-60 to +80
Max Pressure in duct	Pa	1500
Maximum Allowable Wind Velocity	m/s	≤15
Max Continuous Running Temperature	℃	≤70
Lifespan of PIR Air Duct	years	>20

PRE-INSULATED DUCT vs G.I. DUCTWORK

Metric	20mm PIR Pre - Insulated Duct (with 0.08mm Alu. Foil, )	0.5mm G.I Duct + 30mm Rubber Plastic (40-90kg/m³)
Fire Safety	Compliant (Class 0/BS 476, AS 1530.3). Self-extinguishing PIR core, low toxic smoke, non-combustible alu foil.	G.I non-combustible; rubber plastic fire-retardant but requires coating to meet strict codes.G.I
Thermal Insulation	Excellent. λ=0.020 W/m·K, no thermal bridging. 20mm integrated structure ensures consistent insulation.	Fair. λ=0.035 W/m·K, thermal bridging at G.I joints. 30mm insulation offset by metal conductivity.
Hygiene & Air Quality	Superior. Non-porous alu foil, smooth inner surface, moisture-resistant PIR. Meets cleanroom/hospital standards.	Poor. Porous rubber plastic traps dust/mold; G.I-insulation gaps breed pathogens.
Lightweight	1.4-1.5 kg/m². Ultra-light, reduces structural load; ideal for retrofits/timber-framed buildings.	5.1–6.3 kg/m². Heavy G.I base + bulk insulation; requires reinforced supports.
Energy Efficiency	Excellent. 20–30% lower HVAC energy consumption. Minimizes heat gain/loss in conditioned air.	Low. 20–30% higher energy loss due to inferior insulation and thermal bridging.
Ease of Construction	Easy. Factory-prefabricated tongue-and-groove joints. No separate insulation step; 40–60% less labor time.	Complex. Two-step on-site process: G.I duct fabrication + rubber plastic wrapping. Labor-intensive, prone to gaps.
Quiet Operation	Good. PIR core absorbs 10–15 dB airflow noise; alu foil dampens vibration.	Fair. Rubber plastic provides basic sound reduction, but G.I vibration and insulation gaps reduce efficiency.
Space Savings	Excellent. 20mm total thickness (all-in-one). Fits tight ceilings/retrofit cavities.	Poor. 30.5mm total thickness (0.5mm G.I + 30mm insulation). Bulky, requires larger installation space.
Environmental Friendliness	Balanced. CFC/HCFC-free PIR, recyclable alu foil. 20–30-year lifespan; net carbon positive in 1–3 years.	Low. Rubber plastic non-recyclable; 10–15-year lifespan. Frequent replacement increases waste; higher energy emissions.
Air Leakage	Superior. ≤2% air leakage (EN 1507, AS/NZS 3660.1). Airtight factory joints + alu foil vapor barrier.	Poor. 5–10% air leakage. On-site sealing gaps; separate vapor barrier required.

Performance comparison based on UNT Duct product data and standard system configurations. Actual performance may vary depending on system design, installation method and project conditions.

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