diff --git a/yaml/xyz/openbmc_project/Inventory/Decorator/ThermalDirection.interface.yaml b/yaml/xyz/openbmc_project/Inventory/Decorator/ThermalDirection.interface.yaml
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+++ b/yaml/xyz/openbmc_project/Inventory/Decorator/ThermalDirection.interface.yaml
@@ -0,0 +1,34 @@
+description: >
+    Indicates the thermal management path through the chassis. This decorator
+    should only be added to xyz.openbmc_project.Inventory.Item.Chassis
+    instances.
+properties:
+    - name: Direction
+      type: enum[self.Direction]
+      default: Unknown
+      description: >
+          This property shall indicate the general direction of the thermal
+           management path through the chassis.
+
+enumerations:
+    - name: Direction
+      description: >
+          Possible airflow direction
+      values:
+          - name: BackToFront
+            description: >
+                A chassis with the air intake in the back and exhaust out the
+                front.
+          - name: FrontToBack
+            description: >
+                A chassis with the air intake in the front and exhaust out the
+                back.
+          - name: Sealed
+            description: >
+                A sealed chassis with no air pathway.
+          - name: TopExhaust
+            description: >
+                A chassis with air exhaust on the top.
+          - name: Unknown
+            description: >
+                A default type for Airflow direction.