Historical clue formulations

• Chimney vents — 2023-09-27
• Chimney components — 2022-09-21
• Sooty channels — 2022-01-02
• Chimney channels — 2021-05-30
• Chimney pipes — 2020-02-03
• Fireplace smoke escapes through them — 2016-02-22
• Draft raisers — 2012-11-11
• They may be full of hot air — 2010-01-02