Windband silencer with means to reduce cross-wind pressure differential

A windband for an exhaust fan system, the windband comprising:

• an elongate housing receivable about an exit nozzle of the exhaust fan system, the elongate housing having an inner chamber forming an exhaust flow path to receive exhaust gas that exits an open top of the exit nozzle, the elongate housing having a bottom portion positioned elevationally below the open top of the exit nozzle, and having a top portion positioned elevationally above the open top of the exit nozzle,
• an air inducer extending from a bottom end of said bottom portion of said elongate housing, said air inducer formed from a perforated material and forming an annulus with the exit nozzle for the induction of ambient air into said inner chamber of said elongate housing,
• a discharge sleeve positioned adjacent and secured to a right angle cylindrical section forming said top portion of said elongate housing, said discharge sleeve formed from a perforated material and forming a passageway through which gas from the exit nozzle and induced ambient air passing through said inner chamber of said elongate housing are discharged, and
• a plurality of elongate fins that secure said elongate housing to said exit nozzle, said plurality of elongate fins assisting in directing induced air through said housing to help minimize turbulent effects, the plurality of elongate fins formed from a perforated material to reduce acoustic resonance,
• said elongate housing further having a right angle cylindrical section forming said top portion, said discharge sleeve being secured to said right angle cylindrical portion and said discharge sleeve having a diameter that is greater than that of said right angle cylindrical section, and
• said air inducer and said discharge sleeve together assisting in the minimization of a pressure differential between an upwind side of said windband and a downwind side of said windband when said windband is subjected to wind.

A windband for an exhaust fan system, the windband comprising:

• an elongate housing receivable about an exit nozzle of the exhaust fan system, the elongate housing having an inner chamber forming an exhaust flow path to receive exhaust gas that exits an open top of the exit nozzle, the elongate housing having a bottom portion positioned elevationally below the open top of the exit nozzle, and having a top portion positioned elevationally above the open top of the exit nozzle,
• an air inducer extending from a bottom end of said bottom portion of said elongate housing, said air inducer formed from a perforated material and forming an annulus with the exit nozzle for the induction of ambient air directly into said inner chamber of said elongate housing,
• a discharge sleeve positioned adjacent and secured to said top portion of said elongate housing, said discharge sleeve having an open top and formed from a perforated material, said discharge sleeve forming a passageway for gas from the exit nozzle and induced ambient air that together pass through said inner chamber of said elongate housing to travel prior to being discharged through said open top;
• and
• a plurality of elongate fins that secure said elongate housing to said exit nozzle, said plurality of elongate fins formed from a perforated material to reduce acoustic resonance, said plurality of elongate fins assisting in directing induced air through said housing to help minimize turbulent effects,
• said elongate housing further having a right angle cylindrical section forming said top portion, said discharge sleeve being secured to said right angle cylindrical section and said discharge sleeve having a diameter that is greater than that of said right angle cylindrical section,
• said air inducer and said discharge sleeve together assisting in the minimization of a pressure differential between an upwind side of said windband and a downwind side of said windband when said windband is subjected to wind.