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KC - Flat Increasing Adaptor - Ø 125-Ø 150 (10-125-009)

National Flues provides a trusted range of high-quality flue solutions, and the KC Flat Increasing Adaptor Ø 125-Ø 150 stands out as an essential connector for woodstoves, oil boilers, and gas fires. This premium adaptor, built from robust stainless steel, seamlessly transitions appliance outlets into the KC system, ensuring safety, durability, and ease of installation. Ideal for the UK market and backed by HETAS and CE approvals, it is a reliable choice for both domestic and professional heating projects.
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£35.99
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At a Glance

  • Robust construction using 304-grade stainless steel for the outer skin and 316-grade stainless steel for the inner skin (each 0.40mm thick)
  • Compressed rockwool insulation with a density of 128kg/m3 for enhanced safety
  • HETAS and CE approved, ensuring compliance with rigorous UK safety standards
  • Designed for versatile use with woodstoves, gas fires, oil boilers, and low sulphur coal appliances
  • Ensures a secure 60mm clearance from combustibles, maximising safety

Please Note: All dimensions refer to the internal diameter of flues. If unsure, please call 01670 206999 to ensure you choose the correct products.

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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:

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Price Match Guarantee: If you find the same product cheaper within 48 hours, we’ll match it and refund the difference.

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Have Questions?
Phone: 01670 206999
Email: [email protected]

The KC Flat Increasing Adaptor Ø 125-Ø 150 is engineered for exceptional performance and versatility. Perfect for use with solid fuel and gas/oil appliances such as woodstoves, gas fires, and oil boilers, this adaptor is designed to connect appliance outlets to KC increasing by 25mm. Built with 304 and 316-grade stainless steel, the outer and inner skins are 0.4mm thick, respectively, ensuring durability.

The compressed rockwool insulation boasts a density of 128kg/m3 for optimal safety and performance. The adaptor maintains a secure 60mm distance from combustibles, certified by its HETAS approval and CE marking. Easily installed using a Locking Band, it provides a secure and instant transition from your appliance or flue to the KC system.

SKU: 10-125-009

Technical Specifications
ProductKC - Flat Increasing Adaptor - u00d8 125-u00d8 150
SKU10-125-009
Outer Material304 Stainless Steel (0.40mm thick)
Inner Material316 Stainless Steel (0.40mm thick)
InsulationCompressed Rockwool (128kg/m3)
ApprovalsHETAS, CE
Distance To Combustibles60mm
Fuel CompatibilityWood, Oil, Gas, Low sulphur coal
Warranty12 Years
Installation Steps: • Ensure that the appliance outlet and the KC system connection point maintain a clear 60mm distance from any combustible materials. • Use the provided locking band to secure the adaptor in place, confirming a tight and stable connection. • Follow the product manual for detailed instructions and safety guidelines. • Double-check all fittings for correct installation to avoid any potential hazards. Caution: Always adhere to local building and safety regulations, and consider professional installation if unsure about any part of the process.

This adaptor is suitable for use with solid fuel and gas/oil appliances, including woodstoves, gas fires, oil boilers, and any other similar solid fuel appliances.

The outer skin is made of 304-grade stainless steel, and the inner skin is constructed from 316-grade stainless steel, both 0.4mm thick. The insulation is compressed rockwool with a density of 128kg/m3.

HETAS approval indicates that this adaptor meets high safety and performance standards for heating appliances and systems in the UK.

The adaptor is installed using a Locking Band to securely connect it to the KC system. Ensure a 60mm distance from any combustible material from the outer surface of the flue.

Yes, it can connect single wall flues or vitreous enamel to the KC system, providing flexibility in installation.

Ensure that there is a safe distance of 60mm from the outside of the flue to any combustible materials, such as wood or plasterboard, to prevent fire hazards.

Yes, given its robust stainless steel construction and high insulation standards, this adaptor is suitable for both indoor and outdoor installations.
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Wednesday, April 30th. 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 KC - Flat Increasing Adaptor - Ø 125-Ø 150 buyers guide

Secure your KC Flat Increasing Adaptor now for unmatched performance and peace of mind.

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