Reducer - Ø 300
At a Glance
- Constructed from high-grade 316L stainless steel
- Reliable push-fit jointing system with Locking Band
- High-pressure sealing gasket (P1/H1) for optimal performance
- Suitable for both non-condensing and condensing applications
- Complies with CE marking and EN 1856-1 standards
- Maintains essential 50mm clearance from combustible materials

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 Reducer - Ø 300 is an essential component in the SWPro modular single wall flue system, crafted from high-grade 316L stainless steel. This flue reducer is engineered for durability and efficiency, featuring a high-pressure sealing gasket (P1/H1) that ensures a secure fit and reliable performance. Suitable for both high and low temperatures, it handles non-condensing and condensing applications with ease, accommodating both positive and negative pressure flue gases.
Whether for boilers, ovens, or ventilation systems, this reducer seamlessly integrates into your chimney shaft liner, thanks to its push-fit jointing system with a Locking Band. Remember to maintain a 50mm clearance from any combustible materials during installation.
SKU: 3-200-008
Technical Specifications | |
---|---|
Material | 316L Stainless Steel |
Gasket | High-pressure P1/H1 |
Application | Boilers, Ovens, Ventilation Systems, Chimney Shaft Liners |
Temperature Range | High and Low Temperature Capable |
Pressure Conditions | Handles both Positive and Negative Pressures |
Clearance Requirement | 50mm from Combustible Materials |
Certifications | CE Marked, EN 1856-1 Compliant |
System | SWPro Modular Flue System |
Delivery Information +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Tuesday, April 29th. 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 - Ø 300 from National Flues is a top-notch solution for adjusting flue system diameters. Its high-quality construction and versatile applications make it perfect for various setups. Plus, we offer reliable nationwide delivery for both retail and trade customers.
The Reducer - Ø 300 is used to decrease the diameter of the proceeding flue system, ensuring compatibility and seamless integration within the SWPro modular flue system.
National Flues is a leading supplier of fireplaces and flue systems across the UK, committed to providing high-quality products at competitive prices with reliable nationwide delivery.
