[EN 16798-1:2019, 3.5]:part of the occupied zone at the head level of the occupantsNote 1 to entry: Head level is 1,7 m standing, 1,1 m seated and 0,2 m for children on the floor.Note 2 to entry: For a definition of occupied zone see EN 16798–3.[ASHRAE Standard 62.1]:the region within an occupied space between planes 3 and 72 in. (75 and 1800 mm) above the floor and more than 2 ft (600 mm) from the walls or fixed air-conditioning equipment.