Across
- 2. Reverse water movement in pipes
- 4. Protective tubing for wires
- 7. Heat-transfer fluid in AC systems
- 9. Electrical force driving current
- 12. Measure of electrical current
- 13. Air distribution channels
- 14. Device that controls water flow
Down
- 1. Unit that releases heat outdoors
- 2. System that heats water for use
- 3. Component used to connect pipes
- 5. Device that stops current during overload
- 6. Process of safely directing electricity to earth
- 8. Curved pipe blocking sewer gases
- 10. Device that controls temperature
- 11. Coil that absorbs indoor heat