NW Ventilation shaft to Morlais Tunnel is a Grade II listed building in the Merthyr Tydfil local planning authority area, Wales. First listed on 11 March 2003. Ventilation shaft.
NW Ventilation shaft to Morlais Tunnel
- WRENN ID
- unlit-forge-furze
- Grade
- II
- Local Planning Authority
- Merthyr Tydfil
- Constituency
- Merthyr Tydfil and Aberdare MP: Gerald Jones (Lab)
- Country
- Wales
- Date first listed
- 11 March 2003
- Type
- Ventilation shaft
- Address
- NW Ventilation shaft to Morlais Tunnel, Pant
- OS grid reference
- SO 017 065
- Coordinates
- 51.74898, -3.4241
- Source
- Cadw listing
Description
The ventilation shaft for the Morlais Tunnel is a circular structure made of red brick. It features battered sides and has raised brick square labels beneath a brick top band. This top band is topped with sandstone coping that supports a shallow-domed iron protective grille. The bricks are arranged in alternating courses of headers and stretchers.
Local climate
NW Ventilation shaft to Morlais Tunnel sits in one of the wettest parts of the UK, with an average of 1,210 mm of rain a year. This makes it wetter than 92% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 87% of listed buildings.
It experiences an average of 44 freeze-thaw cycles a year, more than 85% of listed buildings. Of these, 22 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.
Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.
More on this building
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- No EPC on record for this property
- No sale records on file
- No related consent applications matched
- Detailed attributes — period, style, materials, features
- Flood risk assessment
- Radon risk assessment
- Weather exposure and heating demand — rain and frost month by month and year by year, wind direction, solar and humidity
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