When it comes to traditional timber sliding sash windows, achieving insulation and performance without ruining the heritage look can be a challenge.

That’s why Coastal Group is delighted to introduce the Deventer S6220 sliding sash weather seal, a high-performance solution designed to:

- enhance insulation

- reduce noise

- ensure smooth operation

- while remaining completely concealed

The machining detail for the S6220 Deventer seal is the same as for the SP5920 so you won't even need to retool.

Why Choose the S6220 Weather Seal?

The S6220 is crafted from high-quality TPE, offering durability, flexibility, and long-lasting performance. Unlike traditional brush seals, it does not collect dust, wear out, or discolour over time.

Its hollow chamber design enhances the thermal and acoustic properties of your windows, making homes quieter and more energy-efficient.

Key benefits:

- Improves Insulation – Reduces draughts and heat loss, keeping homes warmer in winter and cooler in summer.

- Minimises Noise – Effectively blocks external sounds, creating a quieter indoor environment.

- Enhances Smooth Sliding – Designed for low friction, ensuring effortless sash movement.

- Invisible Once Installed – Preserves the traditional aesthetic of timber sash windows.

- Improved Working Tolerance – Allows for expansion and contraction.

- Resistant to Weather & Wear – UV, ozone, and temperature resistant (-40°C to +120°C).

- Easy to fit & maintain – No specialist tools required for installation.

How to Test & Maintain Your S6220 Weather Seal

Testing:

After installation, open and close the window several times to ensure the sash moves smoothly.

Check for gaps or areas where the seal may need adjustment.

Maintenance:

- Regular Cleaning: – Wipe the seal with a damp cloth every few months to remove dust and debris.

- Check for Wear: – Inspect the seal annually for any signs of damage or deterioration.

- Replace if Necessary: – If the seal becomes damaged over time, simply remove and replace it.