Product Description

125mm VIT-Smooth 45° / 135° Vitreous Enamel Flue Elbow

Model: 67-125-031

The 125mm VIT-Smooth 45° / 135° vitreous enamel flue elbow creates a controlled change of direction within a compatible 125mm single-wall connecting flue. It is commonly described as either a 45-degree elbow or a 135-degree elbow, depending on how the angle is measured.

Made from 1.2mm zero-carbon steel, the elbow has vitreous enamel applied to its internal and external surfaces. Therefore, it provides a durable, heat-resistant component with a smooth matt black finish that complements many traditional and contemporary stoves.

The swept design helps create an offset while maintaining a smoother flue route than a sharp bend. However, the installer must check the required offset, available space and complete chimney design before ordering.

125mm VIT-Smooth Elbow Features

• 125mm (5-inch) nominal flue diameter
• 45° / 135° elbow configuration
• Manufacturer model number: 67-125-031
• Designed for compatible VIT-Smooth connecting flues
• Helps create an offset or change of direction
• Smoothly finished welded construction
• Made from 1.2mm zero-carbon steel
• Approximately 1.4mm total thickness, including enamel
• Internal and external vitreous enamel coating
• Heat-resistant matt black finish
• Friction-fit connections
• Suitable for compatible gas, oil and solid-fuel appliances
• Maximum continuous operating temperature: 600°C
• Product designation: EN 1856-2 T600 N1 Vm L80120 G375
• Minimum declared distance from combustible materials: 375mm
• Manufactured in the UK
• 12-year warranty, subject to the manufacturer’s terms

Technical Specification

• Product type: Single-wall flue elbow
• Nominal diameter: 125mm (5 inches)
• Elbow angle: 45° / 135°
• Material: Zero-carbon steel
• Steel thickness: 1.2mm
• Total thickness: Approximately 1.4mm, including enamel
• Coating: Internal and external vitreous enamel
• Colour: Matt black
• Joint type: Friction fit
• Temperature classification: T600
• Product standard: EN 1856-2
• Distance from combustibles: 375mm
• Model: 67-125-031

Why Is It Called a 45° / 135° Elbow?

Flue components may describe the same bend using either its angle away from a straight pipe or the internal angle formed by the component. Therefore, this elbow may appear as a 45-degree or 135-degree fitting in product descriptions and installation drawings.

In practical terms, it changes the direction of a straight flue route by 45 degrees. Always use the manufacturer’s dimensional drawing when calculating the exact offset and installed height.

What Is This Flue Elbow Used For?

The elbow allows a compatible 125mm connecting flue to change direction. For example, an installer may use it to form an offset around a suitable non-combustible obstruction or align the stove pipe with the chimney connection above.

Two elbows may be needed to create a complete offset. However, every change of direction adds resistance to the flue gases and may affect sweeping access. Consequently, the installer should keep the route as short and direct as reasonably possible.

Why Choose VIT-Smooth?

VIT-Smooth combines robust steel construction with a carefully finished vitreous enamel surface. The welds are designed to be discreet, while those on the bends are ground smooth to provide a clean and professional appearance.

Furthermore, the internal and external enamel coating helps protect the steel against heat, combustion gases and corrosive deposits. Its matt black colour also coordinates with many popular wood-burning and multifuel stoves.

Suitable Applications

• Compatible wood-burning stoves
• Compatible multifuel stoves
• Suitable gas heating appliances
• Suitable oil-fired appliances
• 125mm VIT-Smooth connecting flues
• Visible single-wall stove-pipe installations
• Offsets within a correctly designed connecting flue
• Connections leading towards a suitable chimney or flue system

Planning a Flue Offset

Check the dimensions carefully when using this elbow to create an offset. The final displacement depends on the number of elbows, their orientation and the length of pipe installed between them.

The complete flue route must also provide suitable support and sweeping access. Do not create an arrangement that can trap soot or condensate, place excessive strain on the joints or prevent effective chimney cleaning.

Installation and Safety Information

Use VIT-Smooth only as a single-wall connecting flue between a compatible appliance and a suitable chimney, flexible liner or insulated twin-wall system. Never use this component to pass through a wall, ceiling, roof or concealed void.

Maintain at least the declared 375mm distance from combustible materials unless a specifically approved installation method requires a greater distance. The installer must also observe the clearances stated by the appliance manufacturer.

Install the elbow in the correct direction so condensate and combustion deposits remain inside the flue system. The friction-fit joints must engage fully and remain mechanically secure. Do not use sealing materials to compensate for damaged, incompatible or poorly fitting parts.

A competent installer should design and fit the complete system. For solid-fuel installations, use a suitably qualified installer, such as a HETAS-registered installer, or notify Building Control where required.

Finally, follow the appliance instructions, current VIT-Smooth guidance and applicable Building Regulations. The appliance manufacturer’s instructions determine the permitted flue diameter, layout and number of bends.

Product Guide

• Download the VIT-Smooth brochure

Why Buy from SNH Tradecentre?

• Competitive prices: We aim to offer excellent value across our flue and chimney range.
• Helpful advice: Our team can help you compare common stove-pipe sizes and fittings.
• Genuine products: Order from an established plumbing and heating merchant.
• Collection available: Collect eligible in-stock products from our Birchington trade counter.
• UK delivery: Choose from the available delivery services at checkout.
• Trade and public welcome: We supply installers, homeowners, landlords and property professionals.

Need help selecting the correct flue elbow? Call SNH Tradecentre on 01843 842727 before ordering. If possible, have the stove model, flue diameter and required offset measurements ready.

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Frequently Asked Questions

What diameter is this VIT-Smooth elbow?

It has a nominal diameter of 125mm, equivalent to approximately five inches. It is designed for compatible 125mm VIT-Smooth connecting-flue components.

Is this a 45-degree or 135-degree elbow?

Both descriptions refer to the same general bend configuration. It changes the direction of the flue by 45 degrees, while the internal angle may be described as 135 degrees.

Can I use two elbows to create an offset?

Two compatible elbows may create an offset when the appliance instructions and chimney design permit it. The installer must calculate the displacement, provide adequate support and maintain sweeping access.

Can I use this elbow with a wood-burning stove?

It may suit a compatible wood-burning or multifuel stove. However, the appliance manufacturer must permit the 125mm flue diameter, component type and proposed number of bends.

What is its maximum operating temperature?

The VIT-Smooth system carries a T600 classification. Therefore, its maximum continuous operating temperature is 600°C. Always observe any lower limit specified by the appliance manufacturer.

Can this elbow pass through a wall or ceiling?

No. This is a single-wall connecting-flue component. It must not pass through walls, ceilings, roofs or concealed spaces. These locations normally require a suitable insulated chimney system.

How far must it be from combustible materials?

The product designation declares a minimum distance of 375mm from combustible materials. However, the installer must assess the complete installation and observe any greater clearance required by the appliance or current regulations.

Does the joint require fire cement?

The component uses friction-fit connections, so fire cement is not normally required between correctly matched VIT-Smooth parts. Nevertheless, the installer must follow the latest manufacturer instructions for the complete system.

Does an elbow affect chimney sweeping?

Yes. Bends can make inspection and sweeping more difficult. Therefore, the system must include suitable access, and the installer should avoid unnecessary changes of direction.

Who should install this flue elbow?

A competent installer should fit it as part of a properly designed chimney system. For solid-fuel installations, consider using a HETAS-registered installer or arranging Building Control notification where required.

Manufacturers may update specifications, dimensions and warranty terms. Therefore, check the latest VIT-Smooth literature and confirm the proposed flue layout before ordering or installation.