Product Description

TWPro 125mm Twin Wall Insulated Rain Cap with Mesh – Matt Black

Model: 37-125-112

Protect your chimney from rain, birds and vermin with the TWPro 125mm Twin Wall Insulated Rain Cap with Mesh. The terminal combines a standard rain cap with 25mm square wire mesh, which helps prevent birds and small animals from entering and blocking the flue.

In addition, its matt-black finish matches the rest of the TWPro black twin-wall chimney system. Therefore, it provides a practical and tidy terminal for compatible solid-fuel and oil-fired installations.

Important: this mesh terminal is not suitable for gas appliances.

Key Features

• Designed for 125mm internal-diameter TWPro twin-wall flue
• Standard rain cap helps reduce direct water entry
• 25mm square wire mesh helps deter birds and vermin
• Helps protect the flue from nesting material and debris
• Suitable for compatible solid-fuel and oil appliances
• Not suitable for gas appliances
• Durable matt-black finish
• FitSystem push-fit joint with locking band
• Maximum operating temperature class: T600
• Declared distance to combustible materials: 50mm
• Product model: 37-125-112

Rain and Bird Protection

The upper cap helps reduce the amount of rain that enters directly through the chimney outlet. Meanwhile, the surrounding 25mm mesh helps prevent birds and vermin from entering the flue and creating a blockage.

This protection can prove especially useful in areas where birds regularly investigate open chimney terminals. However, the mesh does not remove the need for regular chimney inspection and sweeping.

Application

Fit this terminal at the top of a compatible 125mm TWPro or KW Flue twin-wall insulated chimney. It suits compatible wood-burning stoves, multifuel stoves and oil-fired appliances, subject to the appliance and chimney-system instructions.

Do not use this rain cap with a gas appliance. Gas installations require a suitable terminal that the appliance and chimney manufacturers approve for that specific application.

The stated 125mm size refers to the internal flue diameter. Because TWPro includes 25mm of insulation around the inner flue, the main pipe has an approximate outside diameter of 175mm.

TWPro 125mm Rain Cap with Mesh Specification

• Download the TWPro Matt Black information sheet
• View the TWPro installation guide
• Read why we recommend TWPro twin-wall flue
• Product type: rain cap with bird and vermin mesh
• Nominal internal diameter: 125mm
• Approximate system outside diameter: 175mm
• Mesh size: 25mm square
• Fuel compatibility: solid fuel and oil
• Gas compatibility: not suitable
• Finish: matt black
• Inner casing: 0.4mm 316L-grade stainless steel
• Outer casing: 0.4mm 304-grade stainless steel
• Insulation: 25mm injected mineral wool
• Joint method: FitSystem push fit with locking band
• Maximum operating temperature class: T600
• Minimum declared distance to combustible materials: 50mm
• System warranty: 25 years, subject to terms and conditions
• Paint-finish warranty: 2 years, subject to terms and conditions

Approvals and Classification

• HETAS-approved chimney system
• CE marked: EN 1856-1 T600 N1 W V2 L50040 G50
• CE marked: EN 1856-1 T200 P1 W V2 L50040 O20

The above classifications relate to the TWPro system. However, this particular mesh terminal is not suitable for gas appliances. Always choose a terminal that suits the appliance, fuel and complete chimney design.

Installation Guidance

Fit the terminal to the top of the final compatible TWPro chimney section. Next, secure the connection with the correct locking band. Finally, check that the terminal remains vertical, stable and clear of nearby obstructions.

The chimney termination position must comply with current Building Regulations, the appliance instructions and the TWPro installation guide. Furthermore, the chimney must terminate high enough to support safe flue-gas dispersal and reliable draught.

This terminal only fits compatible TWPro and KW Flue components. Do not connect it to another twin-wall brand unless the manufacturer confirms compatibility in writing.

Cleaning and Maintenance

Mesh can collect soot, tar, leaves and other debris over time. Therefore, inspect the terminal regularly and keep every mesh opening clear. A blocked or restricted terminal can reduce chimney draught and prevent combustion gases from escaping safely.

Check the rain cap after severe weather and before restarting an appliance that has remained unused for a long period. In addition, arrange regular chimney sweeping at intervals that suit the appliance, fuel and frequency of use.

During each service, ask the installer or chimney sweep to inspect the mesh, cap, locking band and nearby flue sections. Replace the terminal if corrosion, distortion or damage affects safe performance.

Clearance from Combustible Materials

The TWPro chimney system carries a G50 designation at T600. This classification declares a minimum distance of 50mm from combustible materials under the stated test conditions.

However, always follow the appliance instructions, chimney-system guide and Building Regulations. If another part of the installation requires a greater clearance, use the greater distance.

About the TWPro Twin-Wall Flue System

TWPro provides a complete insulated stainless-steel chimney system for compatible heating appliances. Its FitSystem design uses push-fit joints and locking bands, which help make connections quick and secure.

Furthermore, the smooth matt-black outer casing complements both modern and traditional properties. Matching lengths, bends, supports, flashings and terminals are available to complete the chimney installation.

Why Buy from SNH Tradecentre?

• Specialist stove, chimney and flue-system supplier
• Extensive range of matching TWPro components
• Practical technical advice from an experienced team
• Nationwide UK delivery options
• Secure online ordering
• Trade counter in Birchington, Kent
• Support before and after your purchase

Need help choosing the correct chimney terminal? Call SNH Tradecentre on 01843 842727 before ordering.

Frequently Asked Questions

What does the mesh do?

The 25mm square wire mesh helps prevent birds and vermin from entering the chimney. As a result, it reduces the risk of nests and other debris blocking the flue outlet.

Does the cap stop all rain from entering?

The cap helps reduce direct rainfall entering the chimney. However, no open flue terminal can guarantee that it will prevent every drop of wind-driven rain.

Can I use this terminal with a gas appliance?

No. This mesh terminal is not suitable for gas appliances. Choose an approved gas-compatible terminal instead.

Can I use it with a wood-burning stove?

Yes, it suits compatible wood-burning and multifuel appliances. Nevertheless, confirm the required flue diameter and terminal type in the appliance instructions.

Does it fit ordinary 125mm stove pipe?

No. It connects to compatible 125mm TWPro or KW Flue twin-wall chimney sections. It does not fit standard single-wall stove pipe directly.

What is the outside diameter of the matching pipe?

The 125mm measurement refers to the internal flue diameter. The matching insulated twin-wall pipe has an approximate outside diameter of 175mm.

How often should I inspect the mesh?

Inspect it regularly, especially during the heating season and after severe weather. Also ask your chimney sweep to check and clean it during each service.

Can I use it with another twin-wall flue brand?

No, unless the manufacturer confirms compatibility in writing. Different systems can use different joint profiles, locking bands and dimensions.

How far must the chimney remain from combustible materials?

The TWPro system carries a G50 designation at T600, which declares a minimum distance of 50mm. Always follow any greater clearance required elsewhere in the installation.