Across
- 3. polyethylene film, standard uv treated
- 6. moves air even when the exhaust fan is not running
- 8. controls the temperature, should be at plant level
- 10. span one side of roof is longer than the other
- 11. roof slopes one direction only
- 12. collects and stores heat from the sun
- 13. ridge and furrow construction
- 15. flexible, opaque
- 16. located at opposite end of the exhaust fan
- 19. evan span structures placed one after the other
- 20. impact resistant, energy efficient
- 21. cools the greenhouse and provides a fine mist for seeds and cuttings
Down
- 1. pulls hot air from the greenhouse
- 2. quonset houses set on sidewalls
- 4. provide additional lighting for plants on cloudy or wintery days
- 5. twin wall panels, expensive
- 7. used to reduce the intensity of bright sunlight
- 9. can be gas or electric
- 14. roof is equal in width and pitch on both sides
- 17. used for lights, shade cloth, irrigation
- 18. curved, half-moon roof bars