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This image is a derivative work of the following images:

• File:Central_vacuum_system.png licensed with Cc-by-3.0
  • 2010-09-16T02:45:37Z PleaseStand 1920x2560 (6656995 Bytes) {{Information |Description={{en|1=An AstroVac SR-50 central vacuum power unit installed in a large house. This is one of two units installed there.}} |Source={{own}} |Author=[[User:PleaseStand|PleaseStand]] |Date=2010-07-15 |

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