Colliery Ventilation Furnace at Llandafal is a Grade II listed building in the Blaenau Gwent local planning authority area, Wales. First listed on 26 September 1994. Terraced shop.

Colliery Ventilation Furnace at Llandafal

WRENN ID
final-cinder-owl
Grade
II
Local Planning Authority
Blaenau Gwent
Constituency
Blaenau Gwent and Rhymney MP: Nick Smith (Lab)
Country
Wales
Date first listed
26 September 1994
Type
Terraced shop
Address
Colliery Ventilation Furnace at Llandafal, Cwm
OS grid reference
SO 187 037
Coordinates
51.72662, -3.17719
Source
Cadw listing

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

Description

The colliery ventilation furnace at Llandafal is constructed from brown and yellow firebrick, using black mortar. It has a circular plan with a diameter of approximately 3.5 meters and vertical sides that rise to about 7 meters. The thick walls are topped with large coping bricks featuring a diamond pattern. On the south side, there is a small blocked archway that may have been intended for the addition of another flue. The air shaft connects to a stone-lined drift of a similar date, which enters the hill from the riverbank below.

Local climate

Colliery Ventilation Furnace at Llandafal sits in a wetter-than-average part of the UK, with an average of 1,090 mm of rain a year. This makes it wetter than 87% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 79% of listed buildings.

It experiences an average of 44 freeze-thaw cycles a year, more than 85% of listed buildings. Of these, 21 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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  • 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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