core/homeassistant/components/fan/services.yaml

# Describes the format for available fan services
set_speed:
  description: Sets fan speed.
  fields:
    entity_id:
      description: Name(s) of the entities to set
      example: "fan.living_room"
    speed:
      description: Speed setting
      example: "low"

turn_on:
  description: Turns fan on.
  fields:
    entity_id:
      description: Names(s) of the entities to turn on
      example: "fan.living_room"
    speed:
      description: Speed setting
      example: "high"

turn_off:
  description: Turns fan off.
  fields:
    entity_id:
      description: Names(s) of the entities to turn off
      example: "fan.living_room"

oscillate:
  description: Oscillates the fan.
  fields:
    entity_id:
      description: Name(s) of the entities to oscillate
      example: "fan.desk_fan"
    oscillating:
      description: Flag to turn on/off oscillation
      example: true

toggle:
  description: Toggle the fan on/off.
  fields:
    entity_id:
      description: Name(s) of the entities to toggle
      example: "fan.living_room"

set_direction:
  description: Set the fan rotation.
  fields:
    entity_id:
      description: Name(s) of the entities to set
      example: "fan.living_room"
    direction:
      description: The direction to rotate. Either 'forward' or 'reverse'
      example: "forward"