IL - Gas Flue Box - Freestanding - Ø 125
At a Glance
- Twin wall insulated design for optimal heat retention
- Constructed with an aluminium liner and durable zalutite outer case
- Engineered for naturally aspirated domestic gas fired appliances
- Supports flue gas temperatures up to 250°C
- Certified quality with CE and BS EN 9001:2008
- Suitable for both internal and external applications
- Low stock available, ensuring exclusivity

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 Freestanding IL Gas Flue Box - Ø 125mm is an expertly designed twin wall insulated pre-fabricated gas vent system. Trusted for over 25 years, it stands out for its exceptional quality and reliability. This gas vent is specifically engineered for naturally aspirated domestic gas fired appliances with a draught hood/diverter.
It efficiently operates under negative pressure and dry conditions, sustaining flue gas temperatures up to 250°C. Available in Ø 100mm, Ø 125mm, and Ø 150mm sizes, the product features an aluminium liner and a zalutite outer case, separated by a 6mm air gap. While versatile for both internal and external applications, it is unsuitable for condensing and positive pressure setups.
Shop with confidence, knowing our secure online payments make your purchase safe and straightforward.
SKU: 24-125-61
Technical Specifications | |
---|---|
SKU | 24-125-61 |
Diameter | 125mm |
Inner Material | Aluminium |
Outer Material | Zalutite-coated steel |
Insulation | 6mm air gap |
Max Temperature | 250u00b0C |
System | IL |
Fuel | Gas |
Distance To Combustibles | 50mm (2 inches) |
Warranty | 5 year conditional warranty |
Joint Method | Push fit and twist lock |
Approvals | CE, BS EN 9001:2008 |
Delivery Information +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Thursday, April 3rd. 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.
National Flues Ltd Verdict
The Freestanding IL Gas Flue Box - Ø 125mm is a testament to over 25 years of quality and reliability in the UK. At National Flues, we pride ourselves on our unbeatable prices, reliable delivery service nationwide, and accommodating both retail and trade customers.
The IL Gas Flue Box - Ø 125mm is designed to provide a secure and efficient venting solution for naturally aspirated domestic gas fired appliances with a draught hood/diverter.
National Flues is a trusted supplier of fireplaces and flues across the UK, known for unbeatable prices, reliable delivery, and serving both retail and trade customers with high-quality products.
