Cata GHI 6104 BK /A Instrucciones Para La Instalación, El Uso, El Mantenimiento página 54

 The distance between the cook top ad another device
(e.g.kitchen hood)shall not be less than 700mm(Figure 5).
 If 60 cm Hobs will be place on a built in oven without any cooling
system, it is recommended to leave 300 cm² of ventilation hole
in order to insure air circulation. If 75 or 90 cm cook-top will be
placed the oven has to have cooling fan.
MIN. 700 mm
Figure 5.