PVC / Aluminum Flange Joint for Pre-insulated Air Duct
We offer a range of PVC profiles and aluminum profiles, so you can find the right fit for different installation needs.
Two key types we supply are the PVC/Aluminum Invisible Flange Joint (also called Invisible Profile) and H Bayonet—both are used to connect straight duct sections when installing pre-insulated HVAC ducts.
Material & Specification Details:
We provide these joints in two materials: PVC and aluminum. For the PVC version, there are more choices to match your needs:
Colors: Two options—grey (our regular color) and black.
Thicknesses: Three types available: 20mm, 30mm, and 40mm.
Length: All profiles come in a standard 4-meter length.
Key Advantage of PVC Invisible Flange Joints:
Our PVC invisible flange joints have two great benefits: they are fire-resistant (safe for use in HVAC setups) and have good flexibility (easy to work with during installation).

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How to Use the PVC / Aluminum Invisible Flange?
The PVC/aluminum invisible flange is a component commonly used in HVAC systems for connecting air conditioning ducts. Its usage in this context involves several steps:
01 / Selection of Suitable Size and Type :
The first step is to select an appropriate PVC/aluminum invisible flange based on the size and type of the HVAC ducts being connected. Ensuring that the flange size matches the duct size is essential for a proper fit and connection.
02 / Preparation :
Before installation, it’s important to prepare the surfaces where the flange will be attached. This involves cleaning and ensuring they are free of any debris or contaminants that could affect the quality of the connection.
03 / Installation of Flange :
The PVC invisible profile is positioned at one end of the duct, aligning it with the duct’s opening. It’s then secured in place using suitable fasteners such as screws or bolts. Properly tightening the fasteners ensures a secure connection.
04 / Connecting Ducts :
Once the flange is installed on one duct, the other duct can be connected to it. This is typically done by inserting the end of the second duct into the opening of the flange and securing it in place. This connection ensures a sealed pathway for air flow between the ducts.
05 / Sealing :
To prevent air leakage at the connection point, it’s important to ensure a tight seal between the ducts and the flange. This may involve using sealing materials such as duct tape or sealant to fill any gaps and create an airtight seal.
06 / Testing :
After installation, it’s advisable to test the connection to ensure its secure and airtight. This can be done by pressurizing the duct system and checking for any leaks or weak points in the connection.
Thanks to its excellent products and quality services, UNT Duct is one of the leading UNTduct accessories manufacturers and suppliers in China. Welcome to buy the high quality and customized UNTduct accessories from our factory. We will offer you the best service and fast delivery.
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