IL - Length 305mm (12in) - Ø 125
At a Glance
- High-quality twin wall insulated construction
- Designed for naturally aspirated domestic gas appliances
- Robust aluminium liner paired with a corrosion-resistant Zalutite outer casing
- Features a 6mm air gap for optimum heat management
- Versatile for both internal and external installations

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 305mm (12in) Length Gas Vent Pipe - Ø 125 is a high-quality twin wall insulated pre-fabricated vent, designed specifically for naturally aspirated domestic gas-fired appliances. With over two decades of trusted performance in the UK, this gas vent ensures exceptional reliability and durability. Featuring an aluminium liner and a zalutite outer case separated by a 6mm air gap, it maintains efficiency and safety under negative pressure and dry conditions where flue gas temperatures won't exceed 250°C.
Available in various diameter sizes (100mm, 125mm, and 150mm), this vent pipe is versatile for both internal and external installations but is not suited for condensing or positive pressure applications.
SKU: 24-125-13
Technical Specifications | |
---|---|
Model | IL - Length 305mm (12in) - u00d8 125 |
SKU | 24-125-13 |
Length | 305mm fixed length (267mm installed effective length) |
Diameter | 125mm |
Inner Material | Aluminium |
Outer Material | Zalutite (steel coated with zinc and aluminium) |
Air Gap | 6mm |
Applicable Fuels | Gas |
Maximum Flue Gas Temperature | 250u00b0C |
Distance To Combustibles | 50mm (2 inches) |
Joint Method | Push fit and twist lock |
Warranty | 5 year conditional warranty |
Certifications | CE, BS EN 9001:2008 |
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 305mm (12in) Length Gas Vent Pipe with 125mm diameter is a top choice for quality and reliability. With over 25 years in the market, it's perfect for domestic gas venting. National Flues is proud to offer fast, reliable nationwide delivery to both retail and trade customers.
The IL gas vent pipe is designed to safely vent flue gases from naturally aspirated domestic gas-fired appliances.
National Flues is a leading supplier of fireplaces and flues to both retail and trade customers throughout the UK. Known for their competitive prices and reliable delivery, National Flues offers secure online payments and exceptional service nationwide.
