diff --git a/kasa/fan.py b/kasa/fan.py
@@ -0,0 +1,23 @@
+"""Module for Fan Interface."""
+
+from __future__ import annotations
+
+from abc import ABC, abstractmethod
+
+
+class Fan(ABC):
+    """Interface for a Fan."""
+
+    @property
+    @abstractmethod
+    def is_fan(self) -> bool:
+        """Return True if the device is a fan."""
+
+    @property
+    @abstractmethod
+    def fan_speed_level(self) -> int:
+        """Return fan speed level."""
+
+    @abstractmethod
+    async def set_fan_speed_level(self, level: int):
+        """Set fan speed level."""
diff --git a/kasa/smart/modules/fanmodule.py b/kasa/smart/modules/fanmodule.py
@@ -28,7 +28,7 @@ def __init__(self, device: SmartDevice, module: str):
                 attribute_setter="set_fan_speed_level",
                 icon="mdi:fan",
                 type=Feature.Type.Number,
-                minimum_value=1,
+                minimum_value=0,
                 maximum_value=4,
                 category=Feature.Category.Primary,
             )
@@ -55,10 +55,14 @@ def fan_speed_level(self) -> int:
         return self.data["fan_speed_level"]
 
     async def set_fan_speed_level(self, level: int):
-        """Set fan speed level."""
-        if level < 1 or level > 4:
-            raise ValueError("Invalid level, should be in range 1-4.")
-        return await self.call("set_device_info", {"fan_speed_level": level})
+        """Set fan speed level, 0 for off, 1-4 for on."""
+        if level < 0 or level > 4:
+            raise ValueError("Invalid level, should be in range 0-4.")
+        if level == 0:
+            return await self.call("set_device_info", {"device_on": False})
+        return await self.call(
+            "set_device_info", {"device_on": True, "fan_speed_level": level}
+        )
 
     @property
     def sleep_mode(self) -> bool:

diff --git a/kasa/smart/smartdevice.py b/kasa/smart/smartdevice.py
@@ -14,6 +14,7 @@
 from ..deviceconfig import DeviceConfig
 from ..emeterstatus import EmeterStatus
 from ..exceptions import AuthenticationError, DeviceError, KasaException, SmartErrorCode
+from ..fan import Fan
 from ..feature import Feature
 from ..smartprotocol import SmartProtocol
 from .modules import (
@@ -23,6 +24,7 @@
     ColorTemperatureModule,
     DeviceModule,
     EnergyModule,
+    FanModule,
     Firmware,
     TimeModule,
 )
@@ -36,15 +38,15 @@
 # the child but only work on the parent.  See longer note below in _initialize_modules.
 # This list should be updated when creating new modules that could have the
 # same issue, homekit perhaps?
-WALL_SWITCH_PARENT_ONLY_MODULES = [DeviceModule, TimeModule, Firmware, CloudModule]  # noqa: F405
+WALL_SWITCH_PARENT_ONLY_MODULES = [DeviceModule, TimeModule, Firmware, CloudModule]
 
 AVAILABLE_BULB_EFFECTS = {
     "L1": "Party",
     "L2": "Relax",
 }
 
 
-class SmartDevice(Device, Bulb):
+class SmartDevice(Device, Bulb, Fan):
     """Base class to represent a SMART protocol based device."""
 
     def __init__(
@@ -221,9 +223,6 @@ async def _initialize_modules(self):
                 if await module._check_supported():
                     self._modules[module.name] = module
 
-        if self._exposes_child_modules:
-            self._modules.update(**child_modules_to_skip)
-
     async def _initialize_features(self):
         """Initialize device features."""
         self._add_feature(
@@ -309,6 +308,16 @@ async def _initialize_features(self):
             for feat in module._module_features.values():
                 self._add_feature(feat)
 
+    def get_module(self, module_name) -> SmartModule | None:
+        """Return the module from the device modules or None if not present."""
+        if module_name in self.modules:
+            return self.modules[module_name]
+        elif self._exposes_child_modules:
+            for child in self._children.values():
+                if module_name in child.modules:
+                    return child.modules[module_name]
+        return None
+
     @property
     def is_cloud_connected(self):
         """Returns if the device is connected to the cloud."""
@@ -460,19 +469,19 @@ async def get_emeter_realtime(self) -> EmeterStatus:
     @property
     def emeter_realtime(self) -> EmeterStatus:
         """Get the emeter status."""
-        energy = cast(EnergyModule, self.modules["EnergyModule"])  # noqa: F405
+        energy = cast(EnergyModule, self.modules["EnergyModule"])
         return energy.emeter_realtime
 
     @property
     def emeter_this_month(self) -> float | None:
         """Get the emeter value for this month."""
-        energy = cast(EnergyModule, self.modules["EnergyModule"])  # noqa: F405
+        energy = cast(EnergyModule, self.modules["EnergyModule"])
         return energy.emeter_this_month
 
     @property
     def emeter_today(self) -> float | None:
         """Get the emeter value for today."""
-        energy = cast(EnergyModule, self.modules["EnergyModule"])  # noqa: F405
+        energy = cast(EnergyModule, self.modules["EnergyModule"])
         return energy.emeter_today
 
     @property
@@ -635,6 +644,26 @@ def _get_device_type_from_components(
         _LOGGER.warning("Unknown device type, falling back to plug")
         return DeviceType.Plug
 
+    # Fan interface methods
+
+    @property
+    def is_fan(self) -> bool:
+        """Return True if the device is a fan."""
+        return "FanModule" in self.modules
+
+    @property
+    def fan_speed_level(self) -> int:
+        """Return fan speed level."""
+        if not self.is_fan:
+            raise KasaException("Device is not a Fan")
+        return cast(FanModule, self.modules["FanModule"]).fan_speed_level
+
+    async def set_fan_speed_level(self, level: int):
+        """Set fan speed level."""
+        if not self.is_fan:
+            raise KasaException("Device is not a Fan")
+        await cast(FanModule, self.modules["FanModule"]).set_fan_speed_level(level)
+
     # Bulb interface methods
 
     @property

diff --git a/kasa/tests/smart/features/test_brightness.py b/kasa/tests/smart/features/test_brightness.py
@@ -10,7 +10,7 @@
 @brightness
 async def test_brightness_component(dev: SmartDevice):
     """Test brightness feature."""
-    brightness = dev.modules.get("Brightness")
+    brightness = dev.get_module("Brightness")
     assert brightness
     assert isinstance(dev, SmartDevice)
     assert "brightness" in dev._components

diff --git a/kasa/tests/smart/modules/test_fan.py b/kasa/tests/smart/modules/test_fan.py
@@ -1,8 +1,9 @@
 from typing import cast
 
+import pytest
 from pytest_mock import MockerFixture
 
-from kasa import SmartDevice
+from kasa.smart import SmartDevice
 from kasa.smart.modules import FanModule
 from kasa.tests.device_fixtures import parametrize
 
@@ -12,7 +13,7 @@
 @fan
 async def test_fan_speed(dev: SmartDevice, mocker: MockerFixture):
     """Test fan speed feature."""
-    fan = cast(FanModule, dev.modules.get("FanModule"))
+    fan = cast(FanModule, dev.get_module("FanModule"))
     assert fan
 
     level_feature = fan._module_features["fan_speed_level"]
@@ -24,7 +25,9 @@ async def test_fan_speed(dev: SmartDevice, mocker: MockerFixture):
 
     call = mocker.spy(fan, "call")
     await fan.set_fan_speed_level(3)
-    call.assert_called_with("set_device_info", {"fan_speed_level": 3})
+    call.assert_called_with(
+        "set_device_info", {"device_on": True, "fan_speed_level": 3}
+    )
 
     await dev.update()
 
@@ -35,7 +38,7 @@ async def test_fan_speed(dev: SmartDevice, mocker: MockerFixture):
 @fan
 async def test_sleep_mode(dev: SmartDevice, mocker: MockerFixture):
     """Test sleep mode feature."""
-    fan = cast(FanModule, dev.modules.get("FanModule"))
+    fan = cast(FanModule, dev.get_module("FanModule"))
     assert fan
     sleep_feature = fan._module_features["fan_sleep_mode"]
     assert isinstance(sleep_feature.value, bool)
@@ -48,3 +51,31 @@ async def test_sleep_mode(dev: SmartDevice, mocker: MockerFixture):
 
     assert fan.sleep_mode is True
     assert sleep_feature.value is True
+
+
+@fan
+async def test_fan_interface(dev: SmartDevice, mocker: MockerFixture):
+    """Test fan speed on device interface."""
+    assert isinstance(dev, SmartDevice)
+    fan = cast(FanModule, dev.get_module("FanModule"))
+    device = fan._device
+    assert device.is_fan
+
+    await device.set_fan_speed_level(1)
+    await dev.update()
+    assert device.fan_speed_level == 1
+    assert device.is_on
+
+    await device.set_fan_speed_level(4)
+    await dev.update()
+    assert device.fan_speed_level == 4
+
+    await device.set_fan_speed_level(0)
+    await dev.update()
+    assert not device.is_on
+
+    with pytest.raises(ValueError):
+        await device.set_fan_speed_level(-1)
+
+    with pytest.raises(ValueError):
+        await device.set_fan_speed_level(5)
diff --git a/kasa/tests/test_smartdevice.py b/kasa/tests/test_smartdevice.py
@@ -16,6 +16,7 @@
 from .conftest import (
     bulb_smart,
     device_smart,
+    get_device_for_fixture_protocol,
 )
 
 
@@ -121,6 +122,24 @@ async def test_update_module_queries(dev: SmartDevice, mocker: MockerFixture):
             spies[device].assert_not_called()
 
 
+async def test_get_modules(mocker):
+    """Test get_modules for child and parent modules."""
+    dummy_device = await get_device_for_fixture_protocol(
+        "KS240(US)_1.0_1.0.5.json", "SMART"
+    )
+    module = dummy_device.get_module("CloudModule")
+    assert module
+    assert module._device == dummy_device
+
+    module = dummy_device.get_module("FanModule")
+    assert module
+    assert module._device != dummy_device
+    assert module._device._parent == dummy_device
+
+    module = dummy_device.get_module("DummyModule")
+    assert module is None
+
+
 @bulb_smart
 async def test_smartdevice_brightness(dev: SmartDevice):
     """Test brightness setter and getter."""