How do vacuum secondaries work?

Related questions

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7. How many CFM is a 60000 BTU furnace?
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Tags

1. #against
2. #double
3. #works
4. #spring
5. #secondaries
6. #diaphragm
7. #resistance
8. #plate
9. #engine
10. #sensing
11. #signal
12. #pulls
13. #based
14. #primary
15. #overcome
16. #pumper
17. #secondary
18. #because
19. #vacuum
20. #throttle
21. #forgiving