× National Flues
We Will NOT Be Beaten on Price.
Free Delivery on Orders Over £100
5 Star Reviewed on Trustpilot
Free Flue Design Service Available
Help? 01670 206999 (8am-5pm)

IL - 90° Tee - Ø 125

National Flues proudly presents the IL - 90° Tee - Ø 125, a premium gas vent accessory designed for domestic installations. This twin wall insulated gas vent, also known as an IL gas vent, stands out with its robust aluminium liner and corrosion-resistant zalutite outer case. Perfect for negative pr... More...
Hover to Zoom / Click for Gallery

At a Glance

  • High-quality aluminium liner for durability
  • Robust zalutite outer case with superior corrosion protection
  • Engineered for negative pressure domestic gas vent systems
  • Withstands flue gas temperatures up to 250°C
  • Easy push fit and twist lock joint method
  • Requires an essential tee cap accessory for complete installation
Now only £88.99
Including VAT Buy with confidence. If you find this cheaper within 48 hours of checkout, we'll refund the difference.

 

Payment Options

Please Note: All dimensions refer to the internal diameter of flues. If unsure, please call 01670 206999 to ensure you choose the correct products.

We Won't Be Beaten On Price

At National Flues, we continuously monitor competitor prices. This ensures that we consistently offer you the best deals on all our products. Here’s how we keep your costs low:

  • Daily Price Matching: Our team adjusts prices to ensure we stay competitive.
  • Bulk Purchasing Power: We sell a lot, so we can negotiate better rates with suppliers, passing the savings directly to you.
  • Operational Efficiency: We have streamlined processes to reduce overhead.

Price Match Guarantee: If you find the same product cheaper within 48 hours, we’ll match it and refund the difference.

Free Delivery Over £100: Orders over £100 are free delivery (call us if delivery is required outside the mainland UK).

“I saved 20% on my purchase compared to other retailers. Exceptional service!” – Jane D.

Have Questions?
Phone: 01670 206999
Email: [email protected]

The IL - 90° Tee - Ø 125 is part of a highly reliable twin wall insulated gas vent system that has been a staple in UK homes for over a quarter of a century. Designed for naturally aspirated domestic gas-fired appliances equipped with a draught hood or diverter, this system is ideal where the chimney must operate under negative pressure and dry conditions, with flue gas temperatures not exceeding 250°C. Available in three diameters (100mm, 125mm, and 150mm), the IL system comprises an aluminium liner and a robust zalutite outer case, separated by a 6mm air gap.

It is suitable for both internal and external applications but is not intended for condensing and positive pressure applications.

SKU: 24-125-31

Technical Specifications
SKU24-125-31
ModelIL - 90u00b0 Tee - u00d8 125
CertificationCE, BS EN 9001:2008
Flue Gas TemperatureUp to 250u00b0C
Distance To Combustibles50mm (2 inches)
Inner MaterialAluminium
Outer MaterialZalutite (coated steel)
Joint MethodPush fit and twist lock
FuelGas
ApplicationDomestic, negative pressure systems
Warranty5 year conditional warranty
Before installation, ensure you have the required tee cap accessory to complete the system. The IL - 90° Tee - Ø 125 is designed for both internal and external applications but is not suitable for condensing or positive pressure systems. Carefully follow the manufacturer's guidelines: secure the inner aluminium liner and check that the outer zalutite casing is correctly aligned. Always verify that the 6mm air gap is maintained for optimal thermal insulation. If you are unsure about any part of the installation, consult a certified professional. Safety is paramount, so observe the 50mm clearance to combustibles and be aware of local building regulations.

No, this product is not suitable for condensing boilers or positive pressure applications.

The IL gas vent system features an aluminium liner and a zalutite outer case, with a 6mm air gap providing insulation.

The IL gas vent system is available in three diameter sizes: 100mm, 125mm, and 150mm.

Yes, this product is suitable for both internal and external applications, though it's not to be used in condensing or positive pressure scenarios.

The IL gas vent system is designed to handle flue gas temperatures up to 250°C.

A tee cap is required to properly seal the system and ensure efficient operation.

The IL gas vent system has been trusted by homeowners in the UK for over 25 years, known for its reliability and quality.
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Friday, April 4th. If you need faster stove or fireplace delivery please give us a call. We can often reduce longer lead times if we pay the carrier £25 for express delivery. Visit our Shipping Information page for more information.

Warranty & Returns +

All our products come with warranties. Mi-Flex offers a lifetime guarantee. Returns for damaged items are covered by insurance; non-damaged returns incur return delivery costs.

Price Match Guarantee +

We will match any price like for like. If you find it cheaper within 48 hours, we'll refund the difference.

Read our buyers guide for this IL - 90° Tee - Ø 125

National Flues Ltd Verdict

The IL - 90° Tee - Ø 125 is a fantastic choice for any domestic gas vent system, trusted across the UK for over 25 years. At National Flues, we are proud to offer this reliable product with nationwide delivery and services to both retail and trade customers. Rarely beaten on price, we ensure secure online payments and reliable delivery.

The IL - 90° Tee - Ø 125 is designed for use in domestic gas vent systems, particularly those requiring a negative pressure environment and handling flue gas temperatures up to 250°C.

National Flues is a leading supplier of fireplaces and flues across the UK, known for rarely being beaten on price, offering reliable delivery, and catering to both retail and trade customers with secure online payments.

 

Our Rating Image

Order now to secure your efficient and reliable gas vent setup.

Your recently viewed products:

Multiple Payment Options- including Klarna, Clearpay, Mastercard, Visa and Paypal
Free Design Service