diff --git a/cara/tests/test_ventilation.py b/cara/tests/test_ventilation.py
index aaf64983..bf6a7bb1 100644
--- a/cara/tests/test_ventilation.py
+++ b/cara/tests/test_ventilation.py
@@ -1,6 +1,7 @@
 import dataclasses
 
 import pytest
+import numpy.testing as npt
 
 from cara import models
 
@@ -23,3 +24,28 @@ def test_number_of_windows(baseline_window):
     two_window_exchange = two_windows.air_exchange(room, 1)
     assert one_window_exchange != 0
     assert one_window_exchange * 2 == two_window_exchange
+
+
+@pytest.mark.parametrize(
+    "window_width, expected_cd_b",
+    [
+        [0.5, 0.01369640075],
+        [1., 0.01056914747],
+        [2., 0.00843150922],
+        [4., 0.00779945967],
+    ],
+)
+def test_hinged_window(baseline_window,window_width,expected_cd_b):
+    room = models.Room(75)
+    hinged_window = dataclasses.replace(baseline_window, cd_b=None, 
+            window_type='hinged',window_width=window_width)
+
+    npt.assert_allclose(hinged_window._cd_b, expected_cd_b, rtol=1e-8)
+
+
+def test_sliding_window(baseline_window):
+    room = models.Room(75)
+    sliding_window = dataclasses.replace(baseline_window, cd_b=None, 
+            window_type='sliding')
+
+    assert sliding_window._cd_b == 0.6