How to insert an obstacle (e.g. a boiler).
Step 1: Choose obstacle.
Step 2: In the floor plan, select the wall ceiling from which you are measuring the obstacle.
Step 3: Measure the distance d1.
Step 4: Click on Continue.
Step 5: Meausure
Upper height (upper edge of the obstacle to the ground),
Floor height (lower edge of the obstacle to the floor)
and the distance to the wall.
Step 6: End the command with OK.