Exhaust fan assembly having H-out nozzle

An exhaust assembly for a ventilation system comprising:

• a fan;
• an exhaust nozzle for the fan including:
• a base frame member arranged at an inlet;
• a pair of outer lateral walls extending from opposing sides of the base frame member and disposed on opposite sides of a lateral axis;
• a pair of outer transverse walls extending from opposing sides of the base frame member and disposed between the pair of opposing outer lateral walls;
• a first set of inner lateral walls and a second set of inner lateral walls each extending from a vertex at the inlet toward the corresponding one of the pair of outer lateral walls and, with the pair of outer lateral walls and the pair of outer transverse walls, forming a pair of laterally extending outlets on each side of the lateral axis at an outlet of the nozzle;
• and
• a pair of spaced transverse walls separating the first set of inner lateral walls and the second set of inner lateral walls to form a transverse outlet at the outlet of the nozzle that joins the pair of laterally extending outlets;
• and
• a windband having an entry side disposed with respect to the nozzle so as to receive air from the outlet and to entrain air through a space between the nozzle and the windband, the windband narrowing from the entry side in a downstream direction;
• wherein the inner lateral walls divide airflow from the inlet into at least two distinct passages extending to the corresponding outlet in an outward direction from the lateral axis toward the corresponding one of the outer lateral walls and wherein the walls of the nozzle are essentially planar and are joined at essentially perpendicular corners at the outlet of the nozzle such that the transverse outlet and the pair of laterally extending outlets form an H-shaped airflow outlet;
• and wherein the nozzle directs exhaust air upwardly and outwardly to an outer periphery of the nozzle so that entrainment with ambient air introduced at the entry side of the windband is facilitated.

An exhaust system comprising:

• a fan;
• a ventilation system nozzle for the fan including:
• a pair of outer lateral walls spaced apart on opposite sides of a lateral axis;
• a pair of outer transverse walls arranged between the pair of outer lateral walls to form a generally rectangular nozzle inlet;
• a first pair of inner lateral walls and a second pair of inner lateral walls each angled from the lateral axis toward the corresponding one of the outer lateral walls to form a pair of laterally extending outlets on each side of the lateral axis, wherein the inner lateral walls divide airflow from the inlet into at least two distinct passages extending to the corresponding outlet in an outward direction from the lateral axis toward the corresponding one of the outer lateral walls;
• and
• a pair of spaced transverse walls disposed between the first pair of inner lateral walls and the second pair of inner lateral walls to form a transverse outlet joining the pair of laterally extending outlets, the transverse outlet and the pair of laterally extending outlets forming an H-shaped outlet, the walls of the nozzle being essentially planar and joined at essentially perpendicular corners at the H-shaped air flow outlet;
• and
• a windband having an entry side disposed with respect to the nozzle so as to receive air from the H-shaped outlet and to entrain air through a space between the nozzle and the windband, the windband narrowing from the entry side in a downstream direction;
• and wherein the nozzle directs exhaust air upwardly and outwardly to an outer periphery of the nozzle so that entrainment with ambient air introduced at the entry side of the windband is facilitated.