diff --git a/cara/models.py b/cara/models.py
index 736e0992..56f663f4 100644
--- a/cara/models.py
+++ b/cara/models.py
@@ -489,14 +489,14 @@ class Mask:
         therein (Asadi 2020).
         Obtained from measurements of filtration efficiency and of
         the leakage through the sides.
-        Diameter is in cm.
+        Diameter is in microns.
         """
-        if diameter < 0.5e-4:
+        if diameter < 0.5:
             eta_out = 0.
-        elif diameter < 0.94614e-4:
-            eta_out = 0.5893 * diameter * 1e4 + 0.1546
-        elif diameter < 3e-4:
-            eta_out = 0.0509 * diameter * 1e4 + 0.664
+        elif diameter < 0.94614:
+            eta_out = 0.5893 * diameter + 0.1546
+        elif diameter < 3.:
+            eta_out = 0.0509 * diameter + 0.664
         else:
             eta_out = 0.8167
         return eta_out*self.factor_exhale
@@ -551,7 +551,7 @@ class Expiration(_ExpirationBase):
         total = 0
         for diameter, factor in zip(self.particle_sizes, self.ejection_factor):
             contribution = (volume(diameter) * factor *
-                            (1 - mask.exhale_efficiency(diameter)))
+                            (1 - mask.exhale_efficiency(diameter*1e4)))
             total += contribution
         return total
 
diff --git a/cara/tests/models/test_mask.py b/cara/tests/models/test_mask.py
index 7f7cb242..4a71d13c 100644
--- a/cara/tests/models/test_mask.py
+++ b/cara/tests/models/test_mask.py
@@ -11,7 +11,7 @@ from cara import models
         [np.array([0.3, 0.5]), np.array([0.3, 0.5])],
     ],
 )
-def test_masks_inhale(η_inhale, expected_inhale_efficiency):
+def test_mask_inhale(η_inhale, expected_inhale_efficiency):
     mask = models.Mask(η_inhale=η_inhale)
     npt.assert_equal(mask.inhale_efficiency(), 
                      expected_inhale_efficiency)
@@ -20,11 +20,11 @@ def test_masks_inhale(η_inhale, expected_inhale_efficiency):
 @pytest.mark.parametrize(
     "diameter, factor_exhale, expected_exhale_efficiency",
     [
-        [0.3e-4, 1., 0.],
-        [0.7e-4, 0.3, 0.56711*0.3],
-        [1.e-4, 1., 0.7149],
-        [4.e-4, 0.5, 0.8167*0.5],
-        [5.e-4, 0., 0.],
+        [0.3, 1., 0.],
+        [0.7, 0.3, 0.56711*0.3],
+        [1., 1., 0.7149],
+        [4., 0.5, 0.8167*0.5],
+        [5., 0., 0.],
     ],
 )
 def test_mask_exhale(diameter, factor_exhale, expected_exhale_efficiency):