Reducer 2 diameters - Ø 400
At a Glance
- Crafted from high-grade 316L Stainless Steel
- Complies with EN 1856-1 standards and is CE marked
- Versatile design for both condensing and non-condensing applications
- Features a push-fit jointing system with a secure locking band
- Requires a 50mm clearance from combustible materials for enhanced safety

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
Our Reducer 2 diameters - Ø 400 is part of the SWPro modular single wall flue system, crafted from top-grade 316L stainless steel. Engineered for high and low temperatures, this universal flue system is suitable for both non-condensing and condensing applications, accommodating positive and negative pressure flue gases. The SWPro system is versatile, perfect for boilers, ovens, ventilation systems, and chimney shaft liners.
The robust construction, coupled with a high-pressure sealing gasket (P1/H1), ensures enduring performance and safety. The product holds a CE mark and meets stringent EN 1856-1 standards for various diameters, making it a top choice for professionals. Installation is a breeze with its push-fit jointing system and secure locking band.
Remember to maintain a 50mm clearance from combustible materials.
SKU: 3-300-108
Technical Specifications | |
---|---|
SKU | 3-300-108 |
Diameter Range | u00d8 400 stepping down to smaller diameters (e.g., u00d8 300) |
Inner Material | 316L Stainless Steel |
System | SWPro Modular Single Wall |
Approvals | CE Mark, EN 1856-1 compliant |
Fuel Compatibility | Gas, Oil |
Clearance Requirement | 50mm from combustible materials |
Installation | Push-fit jointing with secure locking band |
Warranty | 10 Years |
Delivery Information +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Friday, April 25th. 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.
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National Flues Ltd Verdict
The Reducer 2 Diameters - Ø 400 is a highly reliable and durable product perfect for your flue system needs. Available at unbeatable prices, we at National Flues ensure prompt nationwide delivery for both retail and trade customers.
This product is used to decrease the flue diameter in modular single wall flue systems, making it versatile for various heating and ventilation setups.
National Flues is a trusted supplier of fireplaces and flues across the UK, known for competitive prices, reliable delivery, and excellent customer service for both retail and trade customers.
