× 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° - Ø 400 (3-400-035)

Discover the Tee 90° - Ø 400 from National Flues, a premium stainless steel flue component designed for efficiency and safety. This high-quality Tee is ideal for use in boilers, ovens, and ventilation systems within both condensing and non-condensing installations. Shop our reliable flue accessories in the UK now and experience industry-leading performance with a product engineered to satisfy EN 1856-1 standards.
Hover to Zoom / Click for Gallery
£365.99
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 high-grade 316L stainless steel
  • Designed for Ø 400 flue systems with a 90° connection
  • Modular SWPro system with push-fit jointing and locking bands
  • Suitable for high and low temperature, condensing and non-condensing applications
  • CE marked according to EN 1856-1 with a high-pressure sealing gasket (P1/H1)

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° - Ø 400 is part of the SWPro modular single wall flue system, engineered from 316 grade stainless steel to ensure durability and high performance. Its high-pressure sealing gasket (P1/H1) guarantees secure and efficient flue gas management. This versatile flue system is suitable for both high and low temperature applications, and it works smoothly with non-condensing and condensing setups in positive and negative pressure environments.

Common applications include use with boilers, ovens, ventilation systems, and as a chimney shaft liner. The SWPro system features a push-fit jointing mechanism with Locking Bands, and it requires jointing gaskets on every connection in P1 and H1 installations. It's crucial to maintain a 50mm clearance from any combustible materials during installation.

SWPro is CE marked and meets stringent industry standards (EN 1856-1).

SKU: 3-400-035

Technical Specifications
Material316L Stainless Steel
Diameteru00d8 400
Pressure SealHigh-pressure sealing gasket (P1/H1)
SystemSWPro modular system
Clearance Requirement50mm from combustibles
CE MarkingEN 1856-1 compliant
Warranty10 Years
Installation of the Tee 90° - Ø 400 is straightforward when following the SWPro guidelines. Ensure that all connections are supplemented with jointing gaskets and secured using the designated locking bands. It is critical to maintain a 50mm clearance from any combustible materials. For optimal performance, clean and inspect each connection point before installation, adhere strictly to the push-fit jointing method, and verify all seals for integrity under both positive and negative pressure conditions. If integrating into a complex system, always consult the complete installation manual or engage a certified technician to ensure compliance with safety standards.

The Tee 90° - Ø 400 is constructed from high-grade 316L stainless steel, offering robust durability and resistance to corrosion.

This Tee is suitable for a wide range of applications, including boilers, ovens, ventilation systems, and as a chimney shaft liner for both high and low temperature systems.

Yes, it carries the CE marking in compliance with EN 1856-1 standards.

The product uses a modular push-fit jointing system secured with Locking Bands. Gaskets must be fitted on every joint in P1 and H1 installations, maintaining a 50mm clearance from any combustible materials.

It features a high-pressure sealing gasket capable of managing both positive and negative pressure environments.

Yes, the Tee 90° - Ø 400 is versatile enough to be used in both condensing and non-condensing applications.

This particular model is for Ø 400 diameters, but the SWPro system includes other sizes as well.
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° - Ø 400 buyers guide

Secure your high-quality Tee 90° - Ø 400 now and experience unparalleled performance in your flue system.

Your recently viewed products:

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