Centre 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.

Centre ventilation shaft to Morlais Tunnel

WRENN ID
rusted-bracket-sorrel
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
Centre ventilation shaft to Morlais Tunnel, Pant
OS grid reference
SO 060 094
Coordinates
51.77625, -3.36286
Source
Cadw listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

The centre 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, which 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

Centre ventilation shaft to Morlais Tunnel sits in one of the wettest parts of the UK, with an average of 1,270 mm of rain a year. This makes it wetter than 94% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 85% of listed buildings.

It experiences an average of 54 freeze-thaw cycles a year, more than 94% of listed buildings. Of these, 30 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.

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