IL - Length 914mm (36in) - Ø 125
At a Glance
- - Trusted over 25 years in the UK
- - Specifically designed for naturally aspirated domestic gas appliances
- - Twin wall insulated construction with an aluminium liner and zalutite outer case
- - Handles flue gas temperatures up to 250°C
- - Certified to CE and BS EN 9001:2008 standards
- - Quick push fit and twist lock installation

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]
- Info
- Specs
- Install
- FAQs
The IL Length 914mm (36in) Ø 125 twin wall insulated pre-fabricated domestic gas vent is a tried and tested solution for naturally aspirated gas-fired appliances. With over 25 years of history in the UK market, this gas vent system is esteemed for its top-notch quality and dependability. Designed for domestic gas appliances featuring a draught hood or diverter, this product operates under negative pressure and dry conditions, handling flue gas temperatures up to 250°C.
Available in three diameter sizes—100mm, 125mm, and 150mm—the IL gas vent comprises an aluminium liner and a zalutite outer case, separated by a 6mm air gap, ensuring robust performance and durability. While suitable for both internal and outdoor applications, it is not designed for condensing or positive pressure environments.
SKU: 24-125-11
Technical Specifications | |
---|---|
SKU | 24-125-11 |
Length | 914mm (36in) fixed length |
Effective Length | 876mm installed |
Diameter | 125mm |
Material - Inner | Aluminium |
Material - Outer | Zalutite (coated steel with zinc and aluminium) |
Operating Temperature | Up to 250u00b0C |
Installation | Internal and External (Non-condensing/Positive Pressure) |
Certifications | CE, BS EN 9001:2008 |
Warranty | 5 year conditional warranty |
Joint Method | Push fit and twist lock |
Fuel Compatibility | Gas |
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.
Compatible and other products that may be of interest...
National Flues Ltd Verdict
The IL Length 914mm (36in) Ø 125 is a stellar choice for your gas venting needs. It's been a trusted option in the UK for over 25 years, known for its exceptional quality and reliability. Suitable for both internal and external installations, this product continues to exceed expectations. Remember, National Flues offers nationwide delivery and serves both retail and trade customers.
This product is designed to vent naturally aspirated domestic gas appliances safely and efficiently.
National Flues is a trusted supplier of high-quality fireplaces and flues, offering exceptional products at competitive prices nationwide. With a focus on reliable delivery and excellent customer service, National Flues caters to both retail and trade customers.
