The chimney tee is a component of the flue system that ensures the efficient and safe evacuation of flue gases from the heating device to the chimney. It allows the connection of flue pipes at different angles and directions, ensuring the optimal operation of the heating installation. It is important to choose the right tee to avoid issues such as poor combustion, condensation, and backdraft.

Types of Chimney Tees

Chimney tees differ based on several key parameters:

Material

• Stainless steel – provides high corrosion resistance, long service life, and safety at high temperatures.
• Galvanized steel – a more affordable option, resistant to external weather conditions but with a shorter lifespan compared to stainless steel.
• Ceramic and chamotte tees – used in traditional brick chimneys and resistant to high temperatures and acid corrosion.

Sizes

Chimney tees come in various diameters – from Ø80 to Ø350 mm, to meet the specific requirements of the flue system.

The diameter must match the flue pipes to prevent smoke retention and insufficient draft.

Tee Angle

• 90-degree tees – used in compact installations where a sharp redirection of the flue pipe is necessary.
• 135-degree tees – preferred for smoother evacuation of flue gases, reducing the risk of soot buildup and improving draft.

Benefits of Choosing the Right Chimney Tee

• Better heating system efficiency – optimal evacuation of flue gases improves combustion and reduces fuel consumption.
• Longer chimney lifespan – prevents condensation and corrosion buildup that can damage the chimney system.
• Safer operation – the right choice and installation reduce the risk of backdraft and carbon monoxide leaks.

Installation and Maintenance

Proper Installation

Installing chimney tees is relatively easy, but it is important to follow these principles:

• Ensure that the tee diameter matches your chimney system.
• Use quality sealants if necessary to prevent smoke leakage.
• Follow the correct connection direction to avoid condensation and soot buildup.
• For more complex chimney systems, it is recommended to have installation performed by a specialist.

Regular Maintenance

To ensure longevity and safety, regular cleaning and inspection of the tee and the entire flue system are necessary:

• Cleaning soot and creosote – recommended at least twice a year.
• Checking for mechanical damage – corrosion, cracks, or loose connections can compromise system performance.
• Consulting a professional – if you suspect any issues, seek advice from a chimney sweep or heating specialist.

Signs of a Damaged or Inefficient Chimney Tee

If you notice any of the following symptoms, an inspection and possible replacement of the tee may be necessary:

• Visible corrosion – especially in galvanized models.
• Cracks or deformations – compromising the structure of the chimney system.
• Poor smoke evacuation – smoke in the room or a burning smell may indicate improper flue operation.
• Condensation and tar buildup – often due to an incorrectly chosen diameter or poorly sealed joints.