Different Types of Ductwork

November 20, 2025

Ductwork is a part of an HVAC system that serves one of the most important purposes. Ductwork is responsible for transferring cooled or heated air throughout your home or commercial space. There are many different types of ductwork material and shapes you can choose from. They each have their own advantages and disadvantages. The type of ductwork you use greatly depends on your specific HVAC needs with the help of an HVAC professional. In general, there are two different types of ductwork: rigid and flexible. Below we explain, the pros and cons of each.

What Is Sheet Metal Ductwork?

The most common type of ridged air duct is constructed of galvanized steel or aluminum. Sheet metal air ducts are the most durable type of air duct construction, and because their non-porous surface, are the least likely to have mold or biological growth. Furthermore, galvanized steel ducting has a zinc coating that can deter rust. These ducts are most commonly lined with fiberglass, externally wrapped or can be double walled. Aluminum ductwork is very light and easy to install. They can also be customized depending on your needs.

Fiberglass Ductwork's Pros And Cons

These panels are designed with built in thermal insulation. The lining is used as insulation from heat loss and avoid condensation. The interior surface of these ducts absorb sound, and provide a quiet operation for both heating and cooling. As a result, this type of ducting is common in commercial or office buildings. However, the fiberglass in the ducting can deteriorate and release particles into the air. Along with their potential for deterioration long term exposure to these particles can be a major health concern.

What is Fiberboard Ductwork?

Fiberboard air ducts are constructed by boards of compressed resin bonded by inorganic glass fibers. Unlike fiberglass ducting, the interior of the fiberboard ducting is used to seal and prevent fiberglass particles from dispersing into the airflow. Furthermore, they are insulated and provide sound barrier and thermal benefits. They are commonly the most affordable type of ducting to install. However, they are not recommended due to harboring mold and bacteria in humid climates. Due to their rough surface they can also restrict airflow and decrease efficiency.

What Is Flexible Ductwork?

Flexible air ducts are constructed with a spring steel wire helix, encapsulated in a 2-ply, polymer plastic. They come in a variety of configurations are inexpensive, lightweight, and easy to install. They are best used in spaces where rigid ducting is not a possibility. It is important that the lengths of the flexible air ducts be kept as short as possible. A large amount of bends, sharp turns need to be kept at a minimal. A large number of these can great greatly reduce system air flow and effect system performance and efficiency. On the other hand flex duct is a good option for indoor air quality because they are mold and rust resistant.

About LA Heating & Air

Contact us today at (818) 341-3406 or online for a free estimate for installation or replacement. Although you may never think about your ducting, they serve an important purpose as part of your HVAC system. At some point, you may need to replace your ductwork to keep the efficiency of your HVAC system. Contact us today to see how we can help with your project. To learn more about services our company offers, please visit our homepage.

Different Types of Ductwork Related Posts:

‍

Customer Reviews & Testimonials

Click To Schedule Your FREE Replacement Estimate Today!

Book Online

New In Our Blog

Piggy Bank with cash falling out near AC

Why Load Calculations Are Essential for Heat Pump Installation in Los Angeles

Discover how Manual J load calculations ensure accurate heat pump sizing, better comfort, lower energy bills, and compliance with Los Angeles rebate and Title 24 requirements.

Heat Pump Rebates in Los Angeles (2026): Complete Guide to HEEHRA, LADWP, Burbank, Glendale, Federal Tax Credits & More

See all heat pump rebates available in Los Angeles, including HEEHRA, LADWP, Burbank, Glendale, GoZero, SCE incentives, and the $2,000 federal tax credit

Heat Pump Installation & Electrification in Los Angeles: Complete Cost, Rebate & Contractor Guide

Heat pumps are rapidly becoming the preferred HVAC solution for Los Angeles homeowners looking to reduce energy bills, improve comfort, and qualify for major California rebates. This hub is your complete, authoritative guide to everything you need to understand before replacing your AC or furnace with a modern heat pump — including costs, rebates, system sizing, and how to choose the right contractor.

Heat Pump Installation in Los Angeles: How to Choose the Right Contractor

This guide explains how heat pump installation works in Los Angeles and what homeowners should look for when choosing a contractor. It covers installation requirements, common mistakes, certification and permit considerations, pricing factors, and how to avoid issues that affect comfort, rebates, and long-term performance—so you can make an informed decision before installing a heat pump.

Why TECH-Certified Contractors Are Required for Heat Pump Rebates in California

If you’re considering a heat pump in California, this post explains one critical requirement most HVAC companies leave out: TECH certification. You’ll learn why the state requires TECH-certified contractors for rebates, how certification affects install quality and system performance, and what can go wrong if you choose the wrong installer. It also shows how TECH compliance protects you from denied rebates, poor airflow, and systems that can’t keep up with LA heat—so you can make a confident, informed decision before you install.

The HVAC “$5,000 Rule” — A Simple Way to Know When to Repair or Replace Your AC

Learn how the HVAC $5,000 Rule helps you decide whether AC repair or replacement makes financial sense. Simple formula, expert guidance for LA homeowners.