Across
- 5. BTU PER HOUR
- 8. PVC
- 9. H2O
- 11. GV
- 12. TEMPERATURE AND PRESSURE
- 13. BRITISH THERMAL UNIT
- 14. POWER DIRECT VENT
- 15. UNIFORM ENERGY FACTOR
Down
- 1. OXIDE NoX
- 2. COMMERCIAL ELECTRIC HEAVY DUTY
- 3. WH
- 4. PV
- 6. POUNDS PER SQUARE INCH
- 7. CARBON DIOXIDE
- 10. CO2
- 16. FIRST HOUR RATING