TWPro MB - H-Cowl - Ø 125
At a Glance
- Robust 304 stainless steel outer skin with high temperature black coating
- Durable 316L stainless steel inner skin and 0.40mm thickness for long-lasting performance
- Fully HETAS approved and CE marked for safety and compliance
- No moving parts design, ideal for high wind areas
- Insulated with 200kg/m3 compressed rockwool to enhance energy efficiency
- Secure locking band ensures stability during installation

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 TWPro MB - H-Cowl - Ø 125 is a top-of-the-line anti-down draft terminal, specifically designed for solid fuel, gas, and oil appliances. It is ideal for woodstoves, gas coal effect fires, oil boilers, and gas boilers. Manufactured with a robust outer skin of 0.4mm thick 304 stainless steel and a 0.4mm thick inner skin made of 316 grade stainless steel, the H-Cowl is insulated with compressed rockwool at a density of 200kg/m3.
This exceptional construction ensures durability and high-performance. The high-temperature black finish adds an extra layer of protection. Fully HETAS approved and CE marked with designation numbers EN1856-1 T600 N1 W V2 L50040 G50 and EN1856-1 T200 P1 W V2 L50040 O20, it guarantees safety and compliance.
Installation is straightforward with all parts fully welded and a secure locking band provided. Be mindful to maintain a safe distance of 50mm from any combustible materials during installation.
SKU: 37-125-103
Technical Specifications | |
---|---|
SKU | 37-125-103 |
Designation 1 | EN1856-1 T600 N1 W V2 L50040 G50 |
Designation 2 | EN1856-1 T200 P1 W V2 L50040 O20 |
Outer Material | 304 Stainless Steel - 0.40mm thick, High Temperature Black Coated |
Inner Material | 316L Stainless Steel - 0.40mm thick |
Insulation | Compressed Rockwool (200kg/m3) |
Fuel Compatibility | Wood, Oil, Gas, Low Sulphur Coal |
Approvals | HETAS / CE |
Minimum Combatible Clearance | 50mm |
Diameter | 125mm (5 inch) |
Delivery Information +
We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Friday, April 4th. 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 TWPro MB - H-Cowl - Ø 125 is an outstanding anti-down draft terminal, providing excellent protection against water ingress. With nationwide delivery and full support for both retail and trade customers, National Flues ensures you're getting the best in quality and service.
The TWPro MB - H-Cowl - Ø 125 is designed to prevent downdrafts and water ingress in chimneys, making it ideal for use in high wind areas. It is compatible with various fuel-burning appliances, including solid fuel, gas, and oil systems.
The TWPro series by National Flues represents the pinnacle of quality and innovation in chimney and flue solutions. Renowned for their robust construction and superior performance, TWPro products are a trusted choice for both trade and retail customers across the UK.
