Related Clues:
- Fuel designed that deals with smoke problem
- Unidirectional semiconductor
- It may be light-emitting
- Hot-air duct
- Radio tube
- Part of a chimney
- Passage for exhaust gases
- Something a chimney sweep sweeps
- Smoke conduit
- Semiconductor device with two terminals
- Harmful gas outlet
- Air passage of a sort
- Solar panel component
- Lightbulb component
- Simple semiconductor