Non-concentric increaser - Ø 125 (3-125-004)
At a Glance
- High-grade 316L Stainless Steel construction
Modular single wall design for versatile configurations
Push-fit jointing system for ease of installation
High-pressure sealing gasket (P1/H1) for reliable performance
Suitable for both condensing and non-condensing applications
CE marked to meet European safety standards
Minimum clearance requirement of 50mm from combustibles
Ideal for boilers, ovens, ventilation systems, and chimney liners
Delivery Information +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Thursday, June 19th. 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]
- Info
- Specs
- Install
- FAQs
The Non-Concentric Increaser Ø125 is an integral component for any advanced chimney or flue system configuration. Constructed with high-grade 316L stainless steel, this increaser is designed for durability, efficiency, and ease of installation. The product features a modular single wall system and incorporates a high-pressure sealing gasket (P1/H1) to ensure optimal performance under both high and low temperatures, in both condensing and non-condensing applications, as well as with flue gasses in positive and negative pressure environments.
It is particularly suitable for boilers, ovens, ventilation systems, and as a chimney shaft liner. This CE-marked product comes with a push-fit jointing system and requires jointing gaskets at every joint to guarantee a secure fit. Ensure a minimum clearance of 50mm from combustible materials to maximise safety and compliance.
SKU: 3-125-004
| Technical Specifications | |
|---|---|
| SKU | 3-125-004 |
| Diameter | u00d8125 |
| Material | 316L Stainless Steel |
| Approval | CE |
| Gasket Type | High-pressure P1/H1 |
| Flue Gases | Positive and Negative Pressure |
| Warranty | 10 Years |
| Minimum Clearance | 50mm |
