An incubator or thermotherapy device is provided with a reclining surface and with one or more limiting walls and with openings or removed side walls and with a foot side opening or removed foot-side side wall. Air discharge channels (7, 8, 9), on sides, contain guide elements of a guide device (11) with angles in the range of about 15° to 100° and spoilers of a deflecting device (13) with deflection angles of about 15° to 110°. The air discharge velocity is in the range of about 0.1 m/sec to 1.0 m/sec. The guide elements discharge angle in the front-side discharge channel corresponds to the deflection angle of the spoilers in the discharge channels. The air discharge velocity from the front-side discharge channel has a maximum in the middle of the discharge channel and changes continuously towards the sides to the air discharge velocity from the discharge channels.
