what two fasteners are used with fiberglass duct


Fiberglass ducts are widely used in HVAC systems due to the availability of the material and the properties it possesses. Ducts made of fiberglass are stronger than the traditional metal ducts and are more resistant to temperature changes, chemical exposure, and physical damage. When installing these ducts, it is essential to secure them firmly to prevent any air leakage, damage, or safety hazards. One of the critical aspects of ensuring a secure installation is using the right fasteners. In this article, we will explore what two fasteners are commonly used with fiberglass ducts and why they are the best choices.

A Brief Introduction to Fiberglass Ducts

Fiberglass ducts are made by coating fiberglass with resin, which is then heated and molded into a specific shape. The result is a lightweight, durable, and flexible material that can withstand high temperatures, corrosion, and pressure. Fiberglass ducts are commonly used in HVAC systems for transferring air from one place to another or removing unwanted air. They are easy to install, low maintenance, and long-lasting.

Fasteners for Fiberglass Ducts

When it comes to securing fiberglass ducts, a few options are available depending on the installation scenario. The two most common fasteners used with fiberglass ducts are metal drive cleats and nylon straps.

Metal Drive Cleats

Metal drive cleats are T-shaped metal pieces that are inserted into the flanges of the duct and then bent over to hold the duct in place. They are typically made of galvanized or stainless steel, which makes them resistant to rust and corrosion. Metal drive cleats are also reusable and can be easily adjusted or removed if needed. Their primary advantage over other fasteners is that they provide an excellent grip and hold the duct firmly in place, preventing any air leakage or damage. Metal drive cleats are recommended for larger ducts or those that need to be exposed to higher pressure.

Nylon Straps

Nylon straps are another option for fastening fiberglass ducts, and they consist of a strap and a buckle. The strap is wrapped around the duct, and the buckle is tightened to hold the duct in place. Nylon straps are typically made of fire-resistant nylon, making them safe to use in HVAC systems. They are easy to install, and they do not require any special tools or skills. Nylon straps are recommended for smaller ducts or those with low pressure since they do not provide the same level of grip as metal drive cleats.

Factors to Consider When Choosing Fasteners

Choosing the right fastener for fiberglass ducts depends on several factors, such as the size and shape of the duct, the location of the installation, and the level of pressure and airflow. Here are some factors to consider when choosing fasteners:

Duct Size and Shape

Larger ducts require stronger and more durable fasteners, such as metal drive cleats, to hold them in place. Smaller ducts can use nylon straps, which are less aggressive but adequate for their size.

Installation Location

If the duct is located in a hazardous or hard-to-reach area, such as a ceiling, metal drive cleats may be the best option since they provide a secure hold and are less likely to loosen or break.

Level of Pressure and Airflow

If the duct is exposed to high levels of pressure and airflow, metal drive cleats are recommended since they can handle the load and prevent any air leakage or damage.


Fiberglass ducts are an excellent choice for HVAC systems due to their durability, flexibility, and low maintenance. However, it is essential to secure them properly using the right fasteners, such as metal drive cleats or nylon straps. Choosing the right fastener depends on several factors, such as duct size and shape, installation location, and pressure and airflow level. Overall, metal drive cleats provide a better grip and hold, while nylon straps are easier to install and best suited for smaller ducts. By selecting the right fastener for fiberglass ducts, you can ensure a secure installation and long-lasting performance.


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