diff --git a/liquidctl_worker.py b/liquidctl_worker.py
index 05df6a2..9a8fc9b 100644
--- a/liquidctl_worker.py
+++ b/liquidctl_worker.py
@@ -1,4 +1,4 @@
-from liquidctl import find_liquidctl_devices
+from liquidctl import find_liquidctl_devices, cli
 
 class LiquidCTL_Init():
     device_name =       None
@@ -34,4 +34,10 @@ class LiquidCTL_Init():
                 elif key == "Fan speed":
                     self.device_fanSpeed = value
                 elif key == "Pump speed":
-                    self.device_pumpSpeed = value
\ No newline at end of file
+                    self.device_pumpSpeed = value
+
+    def SetFanSpeed(self, speed):
+        with self.dev.connect():
+            cli._device_set_speed(self.dev, args={"<temperature>": [],
+                                                "<channel>": "fan",
+                                                "<percentage>": [str(speed)]})
\ No newline at end of file
diff --git a/main.pyw b/main.pyw
index 99dd6a3..a60ec1f 100644
--- a/main.pyw
+++ b/main.pyw
@@ -2,7 +2,7 @@ import sys
 import qdarktheme
 import win32mica
 import resources
-from PySide6.QtWidgets import QApplication, QMainWindow, QWidget, QVBoxLayout, QLabel, QProgressBar, QGroupBox
+from PySide6.QtWidgets import QApplication, QMainWindow, QWidget, QVBoxLayout, QLabel, QProgressBar, QPushButton
 from PySide6.QtCore import Qt, QTimer, QThreadPool
 from PySide6.QtGui import QFont, QIcon
 from liquidctl_worker import LiquidCTL_Init
@@ -12,7 +12,7 @@ class MainWindow(QMainWindow):
     def __init__(self):
         super(MainWindow, self).__init__()
         self.setWindowTitle("LiquidGUI (v.1.0.1.2)")
-        self.setFixedSize(450, 300)
+        self.setFixedSize(450, 350)
         self.setWindowFlags(Qt.WindowType.Dialog)
         widget = QWidget(self)
 
@@ -32,6 +32,8 @@ class MainWindow(QMainWindow):
         self.prg_pumpSpeed = QProgressBar(format="%v rpm",
                                           minimum=1900,
                                           maximum=2700)
+        self.btn_maxFanSpeed = QPushButton(text="Max Fan Speed")
+        self.btn_maxFanSpeed.clicked.connect(self.max_fan_speed)
         self.lbl_fwVers = QLabel()
 
         layout = QVBoxLayout(widget)
@@ -43,6 +45,7 @@ class MainWindow(QMainWindow):
         layout.addWidget(self.lbl_pumpSpeed)
         layout.addWidget(self.prg_pumpSpeed)
         layout.addWidget(self.lbl_fwVers)
+        layout.addWidget(self.btn_maxFanSpeed)
         layout.setSpacing(10)
 
         self.setLayout(layout)
@@ -64,6 +67,9 @@ class MainWindow(QMainWindow):
         self.prg_pumpSpeed.setValue(lctl_worker.device_pumpSpeed)
         if lctl_worker.device_fwVers != 0 or None:
             self.lbl_fwVers.setText(f"Firmware: v{lctl_worker.device_fwVers}")
+    
+    def max_fan_speed(self):
+        lctl_worker.SetFanSpeed(100)
         
 app = QApplication(sys.argv)
 icon = QIcon(":/icons/LiquidGUI.ico")