Former Boiler House at Dunlop Semtex Factory
No. 355 of 2,223 in Bannau Brycheiniog (Brecon Beacons), No. 173 for history. History, 7.5 km from Crickhowell, just outside Bannau Brycheiniog (Brecon Beacons) National Park.

A Grade II* listed former boiler house that once served the Dunlop Semtex factory.Written by Claude from the facts on this page (describe-v1, 2026-10-31).
Facts
- Heritage
- Grade II* listedCadw, designated historic assets of Wales (DataMapWales), checked 2026-10-31
- Best months
- Any time of yearoffyougo rules
Why it ranks here
Score 0.63 for any trip, from the same formula as every place.- Interests: History and heritage
- Detail in OpenStreetMap: no (weight 0.15)
- Has a website: no (weight 0.1)
- Heritage listing: 80% (weight 0.15)
- Wikipedia and Wikimedia pages: 20% (weight 0.25)