Where do you put return air vents?

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Tags

1. #lowest
2. #metal
3. #supply
4. #returned
5. #place
6. #inside
7. #returns
8. #buildings
9. #furnace
10. #bottom
11. #return
12. #cased
13. #unlike
14. #point
15. #vents
16. #reheated
17. #pulls
18. #walls