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Lid with horizontal drain - Ø 350 (3-350-027)

National Flues presents the Lid with Horizontal Drain – Ø 350, a pivotal accessory in modern modular flue systems. Constructed from premium 316L stainless steel, this high-performance flue component is ideal for both commercial and domestic applications. As a key element of the SWPro system, it meets rigorous EN 1856-1 standards, ensuring durability and reliability. Whether you are assembling a chimney shaft liner, boiler, or ventilation system, this product delivers exceptional performance, making it a top choice among high-quality flue accessories.
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At a Glance

    High-quality 316L stainless steel construction

    Integral to the SWPro modular single wall flue system

    Certified to EN 1856-1 standards for safety and reliability

    Robust 1” BSP stainless steel externally threaded drain connection

    Suitable for both high and low temperature applications (condensing and non-condensing)

    Versatile for boilers, ovens, ventilation systems, and chimney shaft liners

Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Tuesday, July 22nd. This is based on current lead times for this product. 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 on 01670 206 999. 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.

Best 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]

The Lid with horizontal drain - Ø 350 is part of our top-notch SWPro modular single wall flue system, crafted from 316-grade stainless steel. Featuring a high-pressure sealing gasket (P1/H1), this versatile flue system is ideal for both high and low temperature applications, whether non-condensing or condensing, and can handle flue gases in both positive and negative pressure scenarios. Certified by CE with designations EN 1856-1: T200 H1 W Vm L50040 O(50) for diameters Ø 80 up to Ø 200 and EN 1856-1: T200 H1 W Vm L50050 O(50) for diameters Ø 250 up to Ø 400, this flue system guarantees quality and safety.

It’s specifically designed for numerous applications, including boilers, ovens, ventilation systems, and as a chimney shaft liner. Installation is straightforward with the push-fit jointing system secured by Locking Bands, and jointing gaskets are mandatory for all P1 and H1 installations. Maintain a 50mm distance from combustible materials such as wood and plasterboard to ensure safety.

This product incorporates a 1” BSP stainless steel externally threaded drain connection and cap, making it a reliable choice for a drainage point on the end of a header or inclined run.

SKU: 3-350-027

Technical Specifications
Material316L Stainless Steel (Inner); N/A (Outer)
SystemSWPro Modular Single Wall Flue System
CertificationsCE; EN 1856-1: T200 H1 W Vm L50040 O(50) and EN 1856-1: T200 H1 W Vm L50050 O(50)
Drain Connection1u201d BSP stainless steel externally threaded with drain cap
Sealing GasketHigh-pressure sealing gasket (P1/H1)
Temperature ApplicationsSuitable for high & low temperature, condensing and non-condensing systems
Fuel TypesGas, Oil
Distance To Combustibles50mm
Warranty10 Years
Installation is straightforward thanks to the push-fit jointing system. Ensure that jointing gaskets are used in all P1 and H1 installations for a secure and leak-proof fit. Remember to maintain a clearance of 50mm from any combustible materials, such as wood or plasterboard, to guarantee safety. When assembling your flue system, ensure all components are aligned and locked using the provided locking bands, and check that the drain connection is fully threaded and capped to prevent any accidental leaks.

The Lid with Horizontal Drain is made from 316 grade stainless steel, ensuring durability and resistance to corrosion.

The SWPro flue system is suitable for high and low temperature applications, both non-condensing and condensing, with flue gases in positive and negative pressure. It's perfect for boilers, ovens, ventilation systems, and as a chimney shaft liner.

The SWPro flue system is CE marked and meets the standards set by EN 1856-1: T200 H1 W Vm L50040 O(50) and EN 1856-1: T200 H1 W Vm L50050 O(50).

The SWPro flue system uses a modular design with a push-fit jointing system, secured by Locking Bands. Jointing gaskets are required for P1 and H1 installations.

Yes, you must keep a distance of 50mm from the outside of the flue to any combustible materials like wood or plasterboard.

Yes, the product features a 1” BSP stainless steel externally threaded drain connection and cap.

For EN 1856-1: T200 H1 W Vm L50040 O(50), diameters range from Ø 80 to Ø 200. For EN 1856-1: T200 H1 W Vm L50050 O(50), diameters range from Ø 250 to Ø 400.

What our experts say!

"The Lid with Horizontal Drain - Ø 350 is an exceptional choice for both trade professionals and retail customers. Its robust construction and versatile application make it a top-tier product. Plus, with National Flues, you can enjoy reliable nationwide delivery and competitive pricing."

The Lid with Horizontal Drain is designed as a reliable drainage point at the end of a header or inclined run in modular single wall flue systems.

National Flues is a leading supplier of high-quality flues and fireplaces across the UK, offering dependable delivery, competitive prices, and the option for trade accounts. Known for our excellent customer service, we provide secure online payment options for retail customers.

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