× National Flues
We Won't Be Beaten On Price.
Free Delivery on Orders Over £100
100% 5 Star Reviews on Trustpilot
Free Flue Design Service Available
Need Help? 01670 206999 (8am-5pm)

Tee 90° reduced connection Ø 150 - Ø 400 (3-400-R90-150)

Discover National Flues' high-grade Tee 90° Reduced Connection Ø150 - Ø400, a premium stainless steel flue component ideal for cascade header systems. Designed for boilers, ovens, and ventilation applications, this robust, CE marked accessory guarantees superior performance and reliability. Perfectly suited for both trade and retail customers across the UK, our product offers an unbeatable blend of quality, safety, and efficiency.
Hover to Zoom / Click for Gallery
£318.99
with free delivery Give us a call if you find it cheaper and we'll try to price match.

 

Payment Options

At a Glance

  • Constructed from premium 316L stainless steel for exceptional durability
  • CE marked and compliant with EN 1856-1 standards
  • Features a high-pressure sealing gasket for secure, leak-proof performance (P1/H1)
  • Easy push-fit jointing system secured by a robust Locking Band
  • Ideal for cascade header systems, boilers, ovens, and ventilation installations
  • Designed with a safe 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]

The Tee 90° Reduced Connection Ø150 - Ø400 is a premium component of the SWPro modular single wall flue system. Crafted from 316L grade stainless steel, it offers exceptional durability and resilience across a wide range of applications. This includes boilers, ovens, ventilation systems, and chimney shaft liners.

The high-pressure sealing gasket (P1/H1) ensures a leak-proof jointing system. Approved and CE marked, it meets the strict standards of EN 1856-1 for various diameters. The SWPro system is known for its ease of installation, featuring a push-fit jointing system secured with a Locking Band.

It requires jointing gaskets for P1 and H1 installations and maintains a safe 50mm distance from combustible materials.

SKU: 3-400-R90-150

Technical Specifications
Material316L Stainless Steel
Connection Angle90°
Input DiameterØ150
Output DiameterØ400
ApprovalsCE Marked; Compliant with EN 1856-1
SealingHigh-pressure gasket (P1/H1)
InstallationPush-fit jointing system with Locking Band
Clearance50mm from combustibles
ApplicationsBoilers, Ovens, Ventilation Systems, Chimney Shaft Liners
Warranty10 Years
When installing the Tee 90° Reduced Connection, ensure that joint gaskets are used for every connection in P1 and H1 installations. The push-fit jointing system is simple to use – simply insert the component and secure it with the Locking Band. Always maintain a minimum clearance of 50mm from the flue to any combustible materials such as wood or plasterboard. Although the system is designed for ease of installation, it is advisable to consult a professional if you are uncertain about any aspect of the assembly process.

This Tee is suitable for various applications including boilers, ovens, ventilation systems, and as a chimney shaft liner.

Yes, the Tee 90° Reduced Connection Ø150 - Ø400 is CE marked and complies with EN 1856-1 standards.

It is made from high-grade 316L stainless steel, ensuring long-lasting durability and performance.

The Tee features a push-fit jointing system that is secured with a Locking Band. For P1 and H1 installations, joint gaskets must be used in every joint.

No, this Tee is not suitable for condensing systems.

Ensure a 50mm distance from the outside of the flue to any combustible materials like wood or plasterboard.

The high-pressure sealing gasket is rated for P1/H1 applications.
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Thursday, May 1st. Delivery times of products not in our warehouses depend on product availability and shipping. If you need a definitive delivery time give us a call. If you need faster stove or fireplace delivery please also 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. 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 on a retail basis. Give us a call if you find it cheaper and want to buy from us.

Read our review in our Tee 90° reduced connection Ø 150 - Ø 400 buyers guide

Secure your high-performance Tee 90° Reduced Connection now and take your flue system to the next level!

Your recently viewed products:

Multiple Payment Options- including Klarna, Clearpay, Mastercard, Visa and Paypal