Truestar Air Systems

HVAC Insulated Duct Manufacturer

An HVAC insulated duct is a type of ductwork used in heating, ventilation, and air conditioning (HVAC) systems. It incorporates insulation to help improve energy efficiency, maintain temperature control, reduce noise, and prevent condensation. Here’s a detailed explanation in simpler terms:

Why Use Insulated Ducts?

1. Keep Temperature Stable: Insulated ducts help keep the air inside the ducts at the right temperature. This means warm air stays warm in winter, and cool air stays cool in summer, reducing the workload on your HVAC system.

2. Save Energy: By keeping the air temperature stable, the HVAC system doesn’t have to work as hard, which can lower your energy bills.

3. Prevent Water Problems: Insulation prevents condensation from forming on the outside of the ducts. Condensation can lead to mold growth and water damage.

4. Reduce Noise: The insulation also helps to reduce noise from the air moving through the ducts and from the HVAC system itself.

What Are They Made Of?

1. Inner Duct: This is the core part where the air flows through. It can be made of metal (like galvanized steel or aluminum) or flexible materials (like plastic).

2. Insulation Layer: This surrounds the inner duct to provide thermal resistance. Common insulation materials include:

  • Fiberglass: Known for good thermal and sound insulation.
  • Foam: Lightweight and effective at insulating.
  • Mineral Wool: Offers excellent thermal and sound insulation and is fire-resistant.

3. Outer Jacket: A protective layer that covers the insulation. It can be made of foil, plastic, or metal and helps protect the insulation and prevent air leaks.

Types of Insulated Ducts

1. Rigid Insulated Ducts: Made from metal and covered with insulation. They are strong and used where you need durable ductwork.

2. Flexible Insulated Ducts: Made from a flexible core covered with insulation and an outer layer. These are easier to install in tight spaces and are commonly used in homes.

3. Pre-Insulated Ducts: These come with insulation already integrated and are used in commercial and industrial buildings for quick and efficient installation.

Installation Tips

1. Proper Sizing: Make sure the ducts are the right size to handle the air flow without causing pressure issues.

2. Sealing: Seal all joints and connections properly to prevent air leaks. This can be done with special tape or mastic sealant.

3. Support: Use proper supports to keep the ducts in place and maintain the integrity of the insulation.

4. Avoid Compression: Don’t compress the insulation during installation as it reduces its effectiveness.

Standards and Compliance

1. ASHRAE Standards: These are guidelines from the American Society of Heating, Refrigerating and Air-Conditioning Engineers to ensure energy efficiency and performance.

2. SMACNA Standards: Guidelines from the Sheet Metal and Air Conditioning Contractors’ National Association for constructing and installing HVAC ductwork and insulation.

3. Building Codes: Local building codes often require specific insulation levels (R-values) for ductwork to ensure energy efficiency.


1. Residential: Used in homes to improve comfort, reduce energy costs, and minimize noise.

2. Commercial: Used in office buildings, retail spaces, and other commercial settings to meet strict energy efficiency and noise control requirements.

3. Industrial: Used in factories and warehouses where large HVAC systems need efficient and durable ductwork.


  • Energy Efficiency: Reduces heat loss or gain, lowering energy bills.
  • Comfort: Maintains consistent indoor temperatures.
  • Air Quality: Prevents mold growth by avoiding condensation.
  • Noise Reduction: Quieter HVAC operation.
  • Compliance: Meets regulatory requirements for energy efficiency.


1. Regular Checks: Inspect the ducts periodically for any damage or wear.

2. Cleaning: Keep ducts clean to ensure good airflow and efficiency.

3. Repairs: Repair any damage to the insulation or outer jacket promptly to maintain performance.

Leading Manufacturers

Some well-known manufacturers of insulated ducts include:

  • CertainTeed
  • Johns Manville
  • Kingspan Insulation
  • Owens Corning
  • Thermaflex