Mandik FDMB Manual page 54

150*
POSITION:
1 Fire damper FDMB
2 Installation frame
3 Solid ceiling construction
4 Cement lime plate
5 Duct
≥ 50**
150*
53
* min. 110 - Concrete/ min. 125 - Aerated concrete
** Around the perimeter
≥ 50
Installation details see chapter 7