To form slots between partially overlapped and substantially flat baffle plates in a bottom part of a treating chamber and to enable introducing treating air into the treating chamber through the slots by substantially horizontal components of motion.

This device for treating granular products has a treating chamber for receiving granular products to treat them. In a bottom part 14 of the treating chamber, slots 24-26, 28-30 are formed between partially overlapped and substantially flat baffle plates 16-18, 20-21, and through the slots, treating air is introduced into the treating chamber by substantially horizontal components of motion. The slots 24-26, 28-30 are arranged so that opposite two flows of input treating air guided toward each other along a substantially horizontal pass meet along a dispersing area 58, and after that, they are introduced so as to form substantially vertical flow guided upward.