diff --git a/cara/apps/calculator/templates/calculator.form.html.j2 b/cara/apps/calculator/templates/calculator.form.html.j2
index 0986c140..23c2fbb8 100644
--- a/cara/apps/calculator/templates/calculator.form.html.j2
+++ b/cara/apps/calculator/templates/calculator.form.html.j2
@@ -215,8 +215,8 @@
   This tool simulates the long range airborne spread SARS-CoV-2 virus in a finite volume and estimates the risk of COVID-19 infection. It is based on current scientific data and can be used to compare the effectiveness of different mitigation measures.<br>
   <b>Ventilation data:</b> <br>
   <ul>
-    <li>Mechanical ventilation = check the rates with a specialist.</li>
-    <li>Natural ventilation = the window opening distance is between the fixed frame and movable part when open.</li>
+    <li>Mechanical ventilation = check the flow rates with the concerned technical department.</li>
+    <li>Natural ventilation = the type of window. The  opening distance is between the fixed frame and movable part when open.</li>
     <li>HEPA filtration = the air flow of the device. The following values are based on the different fan velocities of a specific commercial device proposed by the HSE Unit:</li>
     <ul>
         <li>Level 6 (max) = 430 m<sup>3</sup>/h (noisy)</li>