diff --git a/cara/apps/calculator/static/form.html b/cara/apps/calculator/static/form.html
index bd4c9df8..4d7b9917 100644
--- a/cara/apps/calculator/static/form.html
+++ b/cara/apps/calculator/static/form.html
@@ -41,9 +41,9 @@ Beta v1.0.0 <span style="float:right; font-weight:bold">Please send feedback to
     <input type="hidden" id="no_ventilation" name="ventilation_type" value="" />
 
     <div id="DIVmechanical_ventilation" style="display:none">
-        <input type="radio" id="air_type_supply" name="air_type" value="air_supply" onclick="require_fields(this)">
+        <input type="radio" id="air_type_supply" name="mechanical_ventilation_type" value="air_supply" onclick="require_fields(this)">
         Air supply flow rate &nbsp;&nbsp; <input type="number" step=0.01 id="air_supply" name="air_supply" min="0" placeholder="(m³)"><br>
-        <input type="radio" id="air_type_changes" name="air_type" value="air_changes" onclick="require_fields(this)">
+        <input type="radio" id="air_type_changes" name="mechanical_ventilation_type" value="air_changes" onclick="require_fields(this)">
         Air changes per hour &nbsp;&nbsp; <input type="number" step=0.01 id="air_changes" name="air_changes" min="0"><br>
     </div>