Dosing module for dosing an urea based reducing agent into a gas exhaust stream

Dosing module (1) for dosing a urea-based reducing agent into a gas exhaust stream generated by a combustion engine and addressed to an after-treatment system (30), said dosing module (1) comprising:

• a dosing housing (20);
• an inlet opening (9) for conveying said gas exhaust stream into said dosing housing (20);
• and
• a nozzle (55) for dosing said urea-based reducing agent,
• characterizing in that said dosing housing (20) develops symmetrically along an axis (X) and in that said inlet opening (9) is axially symmetrically annular about the axis (X) and inclined with respect to said axis (X) of said dosing housing (20) so as to generate an inclined axially symmetrical annular inlet jet (AJ) about the axis (X) and wherein said nozzle is designed so as to generate, inside said dosing housing (20), an urea-based reducing agent spray (UWS).