Product Description

125mm VIT-Smooth 90° Vitreous Enamel Elbow with Access Door

Model: 67-125-040

The 125mm VIT-Smooth 90° elbow with access door creates a right-angle change of direction within a compatible single-wall connecting flue. Its built-in door also provides access for inspecting and sweeping the inside of the bend.

The smooth three-segment construction creates a more gradual internal route than a sharply fabricated square bend. Therefore, it provides a neat directional change while offering useful maintenance access.

Made from 1.2mm zero-carbon steel, the elbow has a powder vitreous enamel coating on its internal and external surfaces. Its smooth matt black finish coordinates with compatible VIT-Smooth pipe and many traditional or contemporary stoves.

However, a 90-degree change can restrict flue-gas flow and make a chimney harder to sweep. A competent installer must confirm that the appliance instructions, chimney design and current regulations permit this component in the proposed position.

125mm 90° Elbow with Door Features

• 125mm (5-inch) nominal flue diameter
• Fixed 90-degree change of direction
• Smooth three-segment elbow construction
• Built-in access door for inspection and sweeping
• Manufacturer model number: 67-125-040
• Designed for compatible VIT-Smooth connecting flues
• Made from 1.2mm zero-carbon steel
• Approximately 0.2mm powder vitreous enamel coating
• Approximately 1.4mm total thickness, including enamel
• Internal and external enamel finish
• Heat-resistant matt black colour
• 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
• 12-year warranty, subject to the manufacturer’s terms

Technical Specification

• Product type: Single-wall flue elbow with access door
• Nominal diameter: 125mm (5 inches)
• Angle: 90°
• Construction: Three-segment smooth elbow
• Access: Built-in inspection and sweeping door
• Material: Zero-carbon steel
• Steel thickness: 1.2mm
• Enamel thickness: Approximately 0.2mm
• Total thickness: Approximately 1.4mm
• Coating: Powder vitreous enamel
• Colour: Matt black
• Joint type: Friction fit
• Temperature classification: T600
• Product standard: EN 1856-2
• Distance from combustibles: 375mm
• Warranty: 12 years, subject to terms
• EAN: 5060795860352
• Model: 67-125-040

What Is a 90° Flue Elbow Used For?

This elbow allows a compatible 125mm connecting flue to change direction by 90 degrees. It may suit certain appliance connections or chimney arrangements where the approved design requires a right-angle change.

Nevertheless, a shorter and more vertical flue route generally supports better natural draught. Therefore, installers should avoid adding a 90-degree bend when a straighter or more gradual route is practical.

The installer must check the product dimensions when calculating the horizontal displacement and installed height. Do not rely on the nominal diameter and angle alone when setting out the system.

What Does Three-Segment Smooth Elbow Mean?

The elbow uses three formed sections to create a smoother internal change of direction. Consequently, the flue gases follow a more gradual route than they would through a sharp square corner.

However, the smooth construction does not remove the effect of a 90-degree bend. The elbow still introduces resistance and must form part of a correctly designed chimney system.

What Is the Access Door Used For?

The built-in door allows a competent person or chimney sweep to reach the inside of the elbow. As a result, they can inspect the bend and remove soot or other deposits that may collect around the change of direction.

A sweeping door can prove especially useful on a 90-degree elbow because cleaning equipment may otherwise struggle to pass around the bend.

However, the door provides local access only. The installer must ensure that every relevant part of the complete chimney remains accessible for inspection and sweeping.

Important Guidance for Solid-Fuel Installations

Solid-fuel connecting flues should remain as short, direct and vertical as reasonably possible. Some appliances and chimney arrangements may not permit a standard 90-degree elbow.

Where a rear appliance outlet needs to turn upwards, a suitable 90-degree tee with a removable cap may provide more direct sweeping access at the base of the vertical flue. The correct component depends on the appliance instructions and complete system design.

A competent installer must choose between an access-door elbow, a tee-and-cap arrangement or another approved solution. Matching the nominal pipe diameter alone does not confirm suitability.

Elbow with Door Versus Standard Elbow

Both components create a 90-degree change of direction. However, this version includes a built-in access door that helps with internal inspection and sweeping.

A standard closed elbow may suit an installation that already provides adequate cleaning access through the appliance or another system component. In contrast, the access-door version may prove more practical where the bend forms a potential obstacle to sweeping.

Elbow with Door Versus Tee and Cap

A 90-degree elbow creates a curved right-angle connection. A tee and cap normally provides a vertical cleaning chamber below the horizontal inlet, allowing deposits to collect and giving the sweep direct access from the base.

For some rear-outlet appliance arrangements, a tee and cap may offer more practical maintenance access. In other designs, a smooth elbow with a door may suit the available space better.

Ask a competent installer to select the correct component for the appliance and proposed chimney route.

Why Choose VIT-Smooth?

VIT-Smooth combines robust steel construction with a carefully finished vitreous enamel surface. The welds are designed to remain discreet, creating 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 finish also complements many 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-flue systems
• Approved right-angle changes of direction
• Installations requiring access at a 90-degree bend
• Visible single-wall stove-pipe installations
• Connections leading towards a suitable chimney system

Positioning the Access Door

Install the elbow so the access door remains visible, unobstructed and easy to reach. Allow enough space for the door to open and for a competent person to insert suitable inspection or sweeping equipment.

Do not position the door against a wall, register plate, bracket or another component. In addition, do not install it inside a concealed space or permanent enclosure.

Rotating the elbow changes both the direction of the flue and the orientation of the door. Therefore, consider the required maintenance access when setting out the installation.

Access-Door Safety

The access door must remain completely closed and correctly secured whenever the appliance operates. Never light or use the appliance with the door open, loose, damaged or missing.

Allow the appliance and chimney to cool fully before opening the door. Hot gases, soot and other combustion deposits may cause burns or create a fire risk.

After inspection or sweeping, clean the closing surfaces and check that the door returns to its correct position. Replace damaged closing or sealing components before returning the appliance to service.

Installation Direction

Install the elbow with the smaller or male end pointing downwards towards the appliance. This orientation helps keep condensate and combustion deposits inside the flue system.

Ensure both connections engage fully and remain mechanically secure. Do not reverse the elbow or force together products with incompatible joint profiles.

Jointing and Sealing

Compatible VIT-Smooth components use close-fitting connections. Consequently, jointing compound is not automatically required at every correctly assembled joint.

However, the appliance and flue manufacturers determine the approved sealing method. Only use suitable fire cement, high-temperature sealant or another jointing product when the current instructions permit it.

Do not seal the access door permanently or apply unsuitable material around its opening. The door must remain functional and removable for future inspection and sweeping.

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 elbow to pass through a wall, ceiling, roof or concealed void.

Maintain at least the declared 375mm distance from combustible materials. These may include timber, furniture, combustible wall finishes and some plasterboard constructions. Follow any greater clearance required by the appliance manufacturer.

The elbow must remain exposed and accessible. Do not box it in, conceal the access door or position it where future maintenance becomes impossible.

The elbow must not support the weight of a flexible liner or chimney system. Use suitable supports to prevent damaging loads on the joints and appliance outlet.

A competent installer should design and fit the complete system. For solid-fuel work, 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 diameter, flue route and number of bends.

Inspection and Maintenance

A competent person should inspect and clean the complete chimney regularly. The required frequency depends on the appliance, fuel, level of use and chimney condition.

The access door simplifies local inspection and sweeping around the 90-degree bend. Nevertheless, the sweep must confirm that their equipment can reach every required section of the system.

Use cleaning equipment that will not damage the vitreous enamel. During maintenance, inspect the door, closure, elbow and adjoining joints for movement, corrosion, distortion or enamel damage.

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 elbows, tees and access components.
• 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 deciding between an access-door elbow and a tee? Call SNH Tradecentre on 01843 842727 before ordering. If possible, have the appliance model, outlet position and proposed flue route 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 components.

What angle does the elbow create?

It changes the flue direction by 90 degrees. The installer must confirm that the complete chimney design permits this right-angle change.

How is the elbow constructed?

It uses three formed segments to create a smooth 90-degree bend. This provides a more gradual internal route than a sharp square corner.

What is the access door used for?

It provides access for internal inspection and sweeping, particularly around the change of direction where soot and other deposits may collect.

Can I operate the appliance with the door open?

No. The access door must remain correctly closed and secured whenever the appliance operates.

Can I fit it to the rear outlet of a stove?

Only when the appliance instructions and complete chimney design permit it. A tee with a removable cap may be more suitable for some rear-outlet arrangements.

Does this elbow replace the need for a tee and cap?

Not in every installation. Although its door provides sweeping access, a tee and cap may offer better access and deposit collection in some rear-outlet flue arrangements.

Will a 90-degree elbow affect chimney draught?

It can. Every bend creates resistance to flue-gas flow, and a 90-degree change normally has a greater effect than a shallower bend. The installer must assess the complete system.

Does the door guarantee that the entire chimney can be swept?

No. It provides local access only. The installer and chimney sweep must confirm that every relevant section of the complete system remains reachable.

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

It may suit a compatible wood-burning or multifuel appliance. However, the appliance manufacturer must permit the 125mm diameter and proposed flue arrangement.

Which way up should the elbow be installed?

The smaller or male end should point downwards towards the appliance. This helps keep condensate and deposits inside the flue system.

What is the maximum operating temperature?

The elbow 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.

How far must it be from combustible materials?

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

Does the joint require fire cement?

Not automatically. Compatible VIT-Smooth components use close-fitting joints. Only apply a suitable jointing product when the current appliance and flue instructions require or permit it.

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, access-door designs and installation guidance. Therefore, check the latest VIT-Smooth literature and confirm that the proposed 90-degree change is permitted before ordering.