Product Description

125mm VIT-Smooth Flue Pipe with Access Door – 500mm

Model: 67-125-016

The 125mm VIT-Smooth flue pipe with access door is a rigid 500mm single-wall connecting pipe designed to simplify chimney inspection and sweeping. Its built-in door provides access to the inside of the flue without requiring the installer or chimney sweep to dismantle the complete pipe run.

The pipe measures 500mm overall and provides an effective installed length of approximately 445mm once connected. Therefore, installers should use the 445mm measurement when calculating the completed flue height.

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

125mm Flue Pipe with Door Features

• 125mm (5-inch) nominal flue diameter
• 500mm overall product length
• Approximately 445mm effective installed length
• Built-in access door for inspection and sweeping
• Rigid, fixed-length construction
• Manufacturer model number: 67-125-016
• 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 connection
• 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: Fixed single-wall flue pipe with access door
• Nominal diameter: 125mm (5 inches)
• Overall length: 500mm
• Effective installed length: Approximately 445mm
• 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
• Model: 67-125-016

What Is the Built-In Access Door Used For?

The access door allows a competent person or chimney sweep to reach the inside of the flue pipe. As a result, they can inspect the internal surface and remove soot or other deposits without separating the adjoining pipe sections.

This access can prove particularly useful where the appliance does not provide a clear sweeping route or where the flue arrangement contains bends or other changes of direction.

However, the door only provides local access to the pipe. The installer must confirm that it allows effective cleaning of all relevant parts of the complete chimney system.

Overall Length Versus Installed Length

The component measures 500mm before installation. When the pipe enters an adjoining component, part of its overall length forms the joint overlap. Consequently, it adds approximately 445mm to the installed flue route.

Always use the effective installed length when measuring between the appliance and chimney connection. Failing to allow for the overlap may result in the completed pipe run being shorter than expected.

Where Should the Access Door Be Positioned?

The installer should position the door where it remains safe, visible and easy to reach for future inspection and sweeping. Do not place it against a wall, inside a concealed space or where another component prevents it from opening correctly.

Allow enough working space for a competent person to open the door and use suitable cleaning equipment. The final position must also maintain the required distance from combustible materials.

Do not position the door where opening it could release deposits directly onto a hot appliance or create avoidable damage to nearby finishes.

Why Choose a Pipe with a Sweeping Door?

Every chimney system needs a practical method of inspection and cleaning. Where access through the appliance or another system component is insufficient, a dedicated sweeping door can provide a convenient solution.

Regular access helps a competent person identify soot accumulation, corrosion, damaged enamel and insecure joints. It also makes ongoing chimney maintenance more straightforward.

Nevertheless, the installer must assess the whole chimney route. One access door may not provide adequate cleaning access where the system has several changes of direction.

Why Choose VIT-Smooth?

VIT-Smooth combines robust steel with a carefully finished vitreous enamel surface. Consequently, it provides a durable and attractive option for visible single-wall connecting flues.

The internal and external enamel coating helps protect the steel against heat, combustion gases and corrosive deposits. Furthermore, its matt black finish complements many wood-burning and multifuel appliances.

Suitable Applications

• Compatible wood-burning stoves
• Compatible multifuel stoves
• Suitable gas heating appliances
• Suitable oil-fired appliances
• 125mm VIT-Smooth connecting-flue systems
• Visible straight sections of single-wall stove pipe
• Installations requiring inspection access
• Installations requiring a dedicated sweeping point
• Connections leading towards a suitable chimney system

Measuring Before Ordering

Measure the required distance between the relevant connection points and account for every joint, adaptor, bend and overlap. Although the pipe measures 500mm overall, it provides approximately 445mm of effective installed length.

Also consider the final position of the access door. It must face a direction that allows it to open and gives the chimney sweep enough room to use suitable equipment.

If the required installed length differs significantly from 445mm, the installer may need another fixed length or an approved adjustable component.

Installation Direction

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

Ensure the pipe engages fully with the adjoining components and remains properly aligned. Do not reverse the joint direction or force together incompatible flue products.

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 access door. Hot gases, soot and other deposits can cause burns or create a fire risk.

After inspection or cleaning, check that the door and any associated sealing components remain clean, undamaged and seated correctly. Replace damaged parts before the appliance returns to service.

Jointing and Sealing

Compatible VIT-Smooth pipes use close-fitting connections. Therefore, jointing compound is not automatically required between every correctly assembled component.

However, sealing requirements can vary according to the appliance connection and complete chimney design. Only use suitable fire cement, high-temperature sealant or another jointing product when the current appliance and flue instructions permit it.

Do not apply sealant around the access door unless the manufacturer specifically requires it. Inappropriate material could prevent the door from opening or interfere with its correct operation.

Can the Pipe Be Cut?

A competent installer may shorten the pipe when the system design permits it. However, cutting must not damage the access door, interfere with the required joint engagement or leave the component unsuitable for connection.

Remove sharp edges carefully and apply suitable high-temperature protective paint to every exposed steel surface. Otherwise, the uncoated steel may rust.

Measure carefully before altering the pipe because the effective installed length will change after cutting.

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 pipe 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.

Keep both the pipe and access door exposed and available for inspection. Do not build around, box in or otherwise conceal the component.

The pipe must not support the weight of a flexible liner or chimney system. Use suitable supports so the joints and appliance outlet do not carry excessive loads.

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.

Inspection and Maintenance

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

Open the door only after the system has cooled. Remove deposits carefully using suitable equipment that will not scratch or contaminate the vitreous enamel.

During maintenance, inspect the door, closure, pipe surface and adjoining joints. Replace any component that shows significant corrosion, distortion, enamel damage or an insecure closure.

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 standard pipes and access-door models.
• 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 choosing the correct access pipe? Call SNH Tradecentre on 01843 842727 before ordering. If possible, have the appliance model, flue diameter and required installed length ready.

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Frequently Asked Questions

What diameter is this flue pipe?

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

Is the pipe exactly 500mm long?

Its overall product length is 500mm. However, the connection overlap means it adds approximately 445mm to the installed flue route.

Why is the installed length only 445mm?

Approximately 55mm forms part of the connection with the adjoining component. Therefore, the effective length added to the completed system is shorter than the overall measurement.

What is the access door used for?

It provides an opening for internal inspection and chimney sweeping. The installer must position it where a competent person can reach and use it safely.

Can the appliance operate while the door is open?

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

Can the access door be hidden behind a wall or enclosure?

No. It must remain visible and accessible for inspection, cleaning and maintenance. The single-wall pipe must not run through a concealed void.

Does this pipe guarantee full sweeping access?

Not necessarily. It provides local access, but the installer must ensure that a chimney sweep can reach all relevant sections of the complete system.

Can I use it with a wood-burning stove?

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

Which way up should the pipe be installed?

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

Can the pipe be shortened?

It may be shortened by a competent installer when the system design permits it. Cutting must not interfere with the access door or joint, and exposed steel requires suitable high-temperature protection.

What is the maximum operating temperature?

The pipe carries a T600 classification. Therefore, its maximum continuous operating temperature is 600°C. Always observe any lower limit stated by the appliance manufacturer.

Can this pipe pass through a wall or ceiling?

No. This is a single-wall connecting-flue pipe. 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 pipe require fire cement?

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

Who should install this pipe?

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 the door position and effective installed length before ordering.