diff --git a/board/czechlight/clearfog/overlay/usr/lib/systemd/system/max31780-fans.service b/board/czechlight/clearfog/overlay/usr/lib/systemd/system/max31780-fans.service
new file mode 100644
index 0000000..a7b1d56
--- /dev/null
+++ b/board/czechlight/clearfog/overlay/usr/lib/systemd/system/max31780-fans.service
@@ -0,0 +1,13 @@
+[Unit]
+Description=Enable fans
+ConditionKernelCommandLine=|czechlight=sdn-inline-g2
+ConditionKernelCommandLine=|czechlight=sdn-roadm-add-drop-g2
+ConditionKernelCommandLine=|czechlight=sdn-roadm-coherent-a-d-g2
+ConditionKernelCommandLine=|czechlight=sdn-roadm-hires-add-drop-g2
+ConditionKernelCommandLine=|czechlight=sdn-roadm-line-g2
+ConditionKernelCommandLine=|czechlight=sdn-roadm-hires-add-drop-g2
+
+[Service]
+Type=oneshot
+RemainAfterExit=yes
+ExecStart=/bin/bash -c 'for FAN in /sys/bus/i2c/devices/1-0020/hwmon/hwmon*/fan{1,2,3,4}_enable; do echo 1 > "$FAN"; done'
diff --git a/board/czechlight/clearfog/overlay/usr/lib/systemd/system/multi-user.target.wants/max31780-fans.service b/board/czechlight/clearfog/overlay/usr/lib/systemd/system/multi-user.target.wants/max31780-fans.service
new file mode 120000
index 0000000..9f2b3d3
--- /dev/null
+++ b/board/czechlight/clearfog/overlay/usr/lib/systemd/system/multi-user.target.wants/max31780-fans.service
@@ -0,0 +1 @@
+../max31780-fans.service
\ No newline at end of file