5″ x 25′ R4.2 Insulated Flex Duct HVAC Flexible Air Duct

This 5″ x 25′ R4.2 Insulated Flexible HVAC Duct is designed for residential and light commercial air distribution systems requiring efficient airflow and moderate insulation performance.

Manufactured by Atco Rubber Products, this flex duct features:

✔ Reinforced gray polyester outer jacket
✔ Double laminated polyester inner core
✔ Encapsulated wire helix for durability and flexibility
✔ R4.2 insulation for improved thermal efficiency

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🔧 Ideal Applications

• Bathroom exhaust runs
• Branch supply lines
• Return air runs
• Residential HVAC systems
• Attic and crawl space installations

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📏 Specifications

• Inner Diameter: 5 inches

• Length: 25 feet

• Insulation Rating: R4.2

• Flexible steel wire helix core

• Lightweight and easy to cut

The R4.2 insulation helps reduce heat gain/loss while maintaining efficient airflow for smaller duct runs.

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💨 Benefits

• Flexible for tight installations
• Helps reduce condensation
• Energy efficient air delivery
• Durable vapor barrier jacket
• Easy installation

5″ x 25′ R4.2 Insulated Flexible Air Duct – HVAC Flex Duct

This 5-inch diameter x 25-foot insulated flexible air duct is designed for residential and light commercial HVAC air-distribution applications. Featuring an R4.2 insulation rating, the duct helps reduce heat transfer while providing a flexible pathway for conditioned supply or return air.

Its flexible construction makes routing through attics, crawl spaces, ceilings, and other confined areas easier than rigid ductwork.

Key Features

• 5″ DIAMETER x 25′ LENGTH – Flexible HVAC duct sized for compatible 5-inch duct connections, registers, boots, and fittings.
• R4.2 INSULATED CONSTRUCTION – Insulated design helps reduce thermal transfer and energy loss as conditioned air travels through the duct system.
• FLEXIBLE HVAC DUCT – Flexible inner duct construction allows easier routing around obstacles and through confined installation areas.
• SUPPLY & RETURN AIR APPLICATIONS – Suitable for compatible residential and light commercial heating, ventilation, and air-conditioning systems.

Product Details

Product Type: Insulated Flexible Air Duct
Nominal Diameter: 5 in.
Length: 25 ft.
Insulation Rating: R4.2
Application: HVAC Air Distribution
SKU: 17002505
Installation: Flexible Ductwork
Condition: New, unless otherwise specified in the listing

Applications

Ideal for compatible:

• Central air-conditioning systems
• Heating and cooling systems
• Supply-air duct runs
• Return-air duct runs
• Residential HVAC installations
• Light commercial HVAC systems
• Attic and crawl-space ductwork
• HVAC replacement and remodeling projects

Package Includes

1 × 5″ x 25′ R4.2 Insulated Flexible Air Duct

Note: Please verify the 5-inch diameter, 25-foot length, and R4.2 insulation requirement for your HVAC system before purchasing. Installation should follow applicable HVAC and local building-code requirements.