Adaptable exhaust box

Abstract

An air exhaust box, for mounting in an exterior building wall and connecting to at least one exhaust duct, includes: a housing having side walls, a rear wall and a front exhaust opening; the front opening having a mounting flange surrounding a periphery of the opening and extending outwardly from the side walls; the rear wall having an inlet opening greater than a predetermined maximum dimension; each of the side walls being joined to the rear wall at an angle less than 90 degrees; and a duct adapter having a cover removably mountable to the rear wall with removable fasteners, the cover having an outer dimension larger than said maximum dimension of the inlet opening and a rearwardly projecting duct sleeve with an inner opening of size between said maximum dimension and a minimum dimension.

1 . An air exhaust box, for mounting in an exterior building wall and connecting to at least one exhaust duct, comprising:
 a housing having side walls, a rear wall and a front exhaust opening; the front opening having a mounting flange surrounding a periphery of the opening and extending outwardly from the side walls; the rear wall having an inlet opening greater than a predetermined maximum dimension; each of the side walls being joined to the rear wall at an angle less than  90  degrees; and   a duct adapter having a cover removably mountable to the rear wall with removable fasteners, the cover having an outer dimension larger than said maximum dimension of the inlet opening and a rearwardly projecting duct sleeve with an inner opening of size between said maximum dimension and a minimum dimension.   
     
     
         2 . The exhaust box of  claim 1  having a plurality of adjacent inlet openings and associated duct adapters, including a baffle wall extending between the adjacent inlet openings from the rear wall to the front exhaust opening. 
     
     
         3 . The exhaust box of  claim 2  wherein the number of inlet openings is between 2 and 4. 
     
     
         4 . The exhaust box of  claim 1  wherein the minimum dimension is a cylindrical sleeve diameter of between 4 inches and 6 inches. 
     
     
         5 . The exhaust box of  claim 1  wherein the adapter includes a forwardly projecting frame. 
     
     
         6 . The exhaust box of  claim 1  wherein the flange comprises a bent over front lip portion of each side wall, wherein each lip portion is joined to adjacent lip portions in an overlapping corner joint.