Furnace (Welsh: Ffwrnais) is a hamlet in Ceredigion, Wales on the A487 trunk road from Machynlleth to Aberystwyth, near Eglwysfach.

Furnace
Dyfi Furnace
Furnace is located in Ceredigion
Furnace
Furnace
Location within Ceredigion
OS grid referenceSN684951
Principal area
Preserved county
CountryWales
Sovereign stateUnited Kingdom
Post townMACHYNLLETH
Postcode districtSY20
Dialling code01654
PoliceDyfed-Powys
FireMid and West Wales
AmbulanceWelsh
UK Parliament
List of places
UK
Wales
Ceredigion
52°32′17″N 3°56′27″W / 52.53803°N 3.94092°W / 52.53803; -3.94092

It is the location of the Dyfi Furnace, used from the 1750s to the 19th century to make pig iron with charcoal as fuel. The site had been used by the Silver Mills of the Society of Mines Royal.

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