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PP duct and pipe fittings

How to connect PP plastic ducts together?

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PP plastic duct is a ventilation duct system made of polypropylene (Polypropylene, PP for short). Polypropylene is a thermoplastic with good chemical stability, high heat resistance and excellent mechanical properties, so it is widely used in ventilation and air conditioning systems.

Joining PP plastic ducts together requires the proper tools and skills. The following are the general steps for connecting PP plastic air ducts:

PP air ducts are widely used

Tools required for PP plastic duct connection:

  • PP plastic duct
  • PP plastic air duct connectors (such as joints, elbows, etc.)
  • PP plastic air duct glue (make sure it is suitable for PP plastic glue)
  • Hot air torch and PP welding rod
  • Cleaning cloth or cotton balls (for cleaning connecting surfaces)
  • Ruler or measuring tape (for measuring)
  • marker or pencil
  • gloves and eye protection

Step by step guide:

Measure and prepare: Measure the length of duct you need to connect, and use a ruler or tape measure to mark the corresponding length.

Clean the joining surface: Wipe the joining surface with a cleaning cloth or cotton ball to make sure it is clean and dry so that the glue can bond better.

Join the ducts together: Join the two ducts together, making sure they are aligned and secure. Use duct connectors such as fittings, elbows, etc., as needed, to aid in the connection.

Hot air gun welding: Adjust the heat gun to a suitable temperature and add PP welding rod. Weld the joint gap of the air duct by hot melting. The advantages of hot melt welding are good sealing effect, high connection temperature and strong pressure resistance. Wait for the temperature to cool down before use.

Glue connections are also possible under special conditions

PP plastic air duct glue: Apply the glue suitable for PP plastic evenly on the connection surface. Make sure the glue covers the entire connection area. Applying Pressure: Once the ducts are attached, apply moderate pressure to make them fit snugly and ensure the glue is well bonded.

Wait to cure: Allow sufficient time for the connection to cure and bond according to the glue instructions. Do not prematurely expose the connection to wind or pressure.

Check the connection: After waiting for the glue to dry sufficiently, check that the connection is firm and has no gaps or looseness.

Be Safe: When using glue, make sure to work in a well-ventilated area and follow the glue’s safe handling guidelines.

PP duct elbow welding


  • Use a glue suitable for PP plastic and make sure it will hold the duct securely.
  • Before joining, make sure the joint surface is clean, dry and smooth so that the glue can bond better.
  • When connecting ducts, ensure that the connection points are aligned and secure to avoid skewing or misalignment.

Please note that the technique of connecting PP plastic air ducts may vary by manufacturer and product, it is recommended to read the product manual carefully and follow the manufacturer’s recommendations before making the connection. If you don’t know much or are not sure about the process of connecting PP plastic air ducts, it is best to seek professional advice.

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