× 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)

VIT-Smooth - Increaser - Ø 125-150mm (67-125-002)

National Flues presents the VIT-Smooth Increaser – Ø 125-150mm, a premium adaption tool designed to seamlessly connect varying pipe diameters in your flue system. This quality accessory is engineered for gas, oil, and solid fuel applications, ensuring reliable performance even at temperatures soaring up to 600°C. Elevate your flue installation with a product that embodies both strength and style, backed by the trusted National Flues brand.
Hover to Zoom / Click for Gallery
£29.49
Give us a call if you find it cheaper and we'll try to price match.

 

Payment Options

At a Glance

  • Crafted from zero carbon steel for maximum durability
  • Finished in sleek, matt black powder enamel
  • Suitable for gas, oil, and solid fuel appliance installations
  • Withstands temperatures up to 600°C
  • Provides a secure, friction-fit joint for simple installation

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 VIT-Smooth Increaser - Ø 125-150mm is the perfect solution for adapting your VIT-Smooth flue system. Specifically designed for connecting your appliance to a flue liner, chimney stack, or twin wall flue system, this increaser is capable of handling gas, oil, and solid fuel appliances with temperatures up to 600°C. Fabricated from zero carbon steel and coated with a durable powder vitreous enamel in a sleek matt black finish, the VIT-Smooth Increaser ensures both strength and style.When installing, ensure that the smaller diameter points downward to keep condensates within the flue system, preventing any external damage or aesthetic degradation.

The VIT-Smooth system uses a friction fit joint that doesn't require sealing; however, for extra security, you may apply jointing compound such as fire cement or high-temperature silicone sealant. Note that the VIT-Smooth pipe should not be used to pass through ceilings or combustible walls and must be installed at least 375mm away from any combustible materials. Proper PPE should be worn during installation for safety.For solid fuel applications, regular chimney inspection and cleaning are crucial.

Adding an access door at directional changes will facilitate maintenance tasks. We recommend that chimneys serving solid fuel appliances be swept at least once a year.

SKU: 67-125-002

Technical Specifications
SKU67-125-002
MaterialZero Carbon Steel
Steel Thickness1.2mm
CoatingPowder Enamel
Coating Thickness0.2mm
ColourBlack
ApprovalEN1856-2 T600 N1 Vm L80120 G375
Distance To Combustible375mm
Diameter125-150mm
Operating TemperatureUp to 600°C
Fuel Types SupportedGas, Oil, Solid Fuel
• Install the VIT-Smooth Increaser with the smaller diameter end facing downwards to ensure condensates remain within the flue system. • The increaser features a friction-fit joint; while it does not require additional sealing, you may choose to apply a jointing compound such as fire cement or high-temperature silicone sealant for added peace of mind. • This product must not be used to pass through ceilings or combustible walls. Ensure a minimum clearance of 375mm from any combustible materials for optimal safety. • Always wear the appropriate personal protective equipment (PPE) during installation. • Regular maintenance, including chimney inspection and cleaning (especially for solid fuel appliances), is recommended to maintain system performance.

The VIT-Smooth Increaser is constructed from zero carbon steel with a powder vitreous enamel coating in a matte black finish.

Yes, it is suitable for use with gas, oil, and solid fuel appliances, handling temperatures up to 600°C.

No, the VIT-Smooth Increaser should not be used to pass through ceilings or combustible walls. Ensure it is installed at least 375mm away from any combustible materials.

Install the increaser with the smaller diameter pointing downward to keep condensates within the flue system. Although it uses a friction fit joint, you can seal each joint with fire cement or high-temperature silicone sealant for extra security.

Yes, appropriate personal protective equipment (PPE) should be worn to ensure safety during installation.

It's recommended to inspect and sweep chimneys serving solid fuel appliances at least once a year, or more frequently if necessary.

Yes, the VIT-Smooth Increaser can be cut to size, but make sure to cover any exposed steel with high-temperature paint to prevent rust.
Delivery Information +

We work relentlessly to ensure you get your order fast. Estimated delivery for this product is Wednesday, April 30th. 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 on a retail basis. Give us a call if you find it cheaper and want to buy from us.

Read our review in our VIT-Smooth - Increaser - Ø 125-150mm buyers guide

Order now to secure reliable performance and unmatched quality.

Your recently viewed products:

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