How to Read a Blueprint

22. Single-pole (on/off) switch

23. Dimmer

24. Three-way switch

25. Phone jack

27. Return-air duct

29. Wiring concealed under floor or below-grade waste pipe

30. Hot-water pipe
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22. Single-pole (on/off) switch

23. Dimmer

24. Three-way switch

25. Phone jack

27. Return-air duct

29. Wiring concealed under floor or below-grade waste pipe

30. Hot-water pipe
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