👀 3 people are viewing this product
× National Flues
Free Delivery on Orders £100+
100% 5* reviewed on Trustpilot
Free stove flue design service
Delivery to mainland UK
Call for help on 01670 206999

IL - Length 457mm (18in) - Ø 100 (24-100-12)

National Flues presents the IL gas vent pipe, a twin wall insulated solution designed specifically for domestic gas appliances. This high-performance gas vent, suitable for a range of residential installations, upholds the legacy of over 25 years of reliability in the UK. Engineered with a robust aluminium liner and a corrosion-resistant zalutite outer case, this gas vent ensures efficient expulsion of flue gases and meets strict safety standards. Whether you are upgrading your chimney flue or i Read more...
The price you pay today £37.99
Give us a call if you find it cheaper and we'll normally price match.
Payment Options

At a Glance

    Suitable for naturally aspirated domestic gas appliances
    Constructed with an aluminium liner and durable zalutite outer case
    Withstands flue gas temperatures up to 250°C under negative pressure
    Fixed 457mm (18in) length for precise installations
    Over 25 years proven reliability in the UK
    Available in multiple diameters (100mm, 125mm, 150mm) to suit various needs
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Tuesday, July 1st. This is based on current delivery times for this product. Delivery for products not in our warehouses can be delayed because of third party carriers. If you need a stove, or other bulky product, to be delivered by a specific time in the next 7 days then please give us a call. We can sometimes 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 and you can read in our blog about they types and terms and conditions for warranties. Mi-Flex flue liner, for example, comes with a lifetime guarantee. Give us a call if you want to know about a specific warranty. 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, on a retail basis. Give us a call if you find it cheaper and want to buy from us.

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 457mm (18-inch) - Ø 100mm twin wall insulated gas vent pipe is an exceptional choice for homeowners seeking dependable flue solutions. Constructed with an aluminium liner and a durable zalutite outer case, this product provides robust performance for naturally aspirated gas-fired appliances. Designed for non-condensing applications, it effectively handles flue gas temperatures up to 250°C under negative pressure and dry conditions.

With various diameter options of 100mm, 125mm, and 150mm, this versatile vent pipe is suitable for both internal and external installations. Backed by over 25 years of reliability in the UK market, the IL gas vent represents quality and efficiency in domestic heating solutions.

SKU: 24-100-12

Technical Specifications
Product NameIL - Length 457mm (18in) - u00d8 100
SKU24-100-12
MaterialAluminium liner / Zalutite coated outer case
Operating TemperatureUp to 250u00b0C
Diameter100mm (also available in 125mm and 150mm)
Length457mm (18in)
ApprovalsCE, BS EN 9001:2008
Warranty5-year conditional warranty
Joint MethodPush fit and twist lock
Before installing the IL gas vent pipe, ensure that you have a stable platform and verify that all installation clearances are adhered to, particularly the 50mm distance from any combustible materials. This product is designed for non-condensing, naturally aspirated gas appliances and is suitable for both internal and external installations. It is crucial that installation follows local building regulations and manufacturer guidelines to maintain peak performance and guarantee safety. Avoid using the vent pipe in systems that involve condensing or positive pressure applications.

The IL gas vent is designed for naturally aspirated domestic gas-fired appliances equipped with a draught hood or diverter.

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

The IL gas vent can handle flue gas temperatures up to 250°C.

Yes, the IL gas vent can be installed both internally and externally.

The IL gas vent features an aluminium liner and a zalutite outer case, separated by a 6mm air gap.

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

The IL gas vent has been successfully used in the UK for over 25 years, building a solid reputation for quality and reliability.

Your recently viewed products:

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