Side-by-side reference

Understand the difference.

Compare the meaning, drawing context and source references of two entries. A similar graphic or shared abbreviation does not establish equivalence.

First referenceCompare with

VOS

Symbols

Ventilation outlet-damper supervision

Monitors the documented exhaust-damper position against the ventilation request. Ventilation control coordinates the equipment that manages heat and air movement in an electrical room. A temperature request, a fan command and proof of airflow are separate signals, and the room design determines how they interact.

Drawing use: Schematic
Application: Installation & communications
Reference family: Manufacturer

A distinction that matters

Different dampers have different return mechanisms. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.

Full reference

SFLI

Symbols

Switchroom fan local-auto interface

Selects the permitted local or automatic command path for the room fan. Ventilation control coordinates the equipment that manages heat and air movement in an electrical room. A temperature request, a fan command and proof of airflow are separate signals, and the room design determines how they interact.

Drawing use: Schematic
Application: Installation & communications
Reference family: Manufacturer

A distinction that matters

Local operation still follows the specified interlocks. This reference describes the named application; it does not establish a new IEC graphical symbol, an ANSI device-function number or an exact manufacturer connection diagram.

Full reference

Follow the full entry for source drawings and the appropriate standard or selected product. Equipment previews show a manufacturer drawing where available, otherwise a 3D thumbnail.