4EQUIVALENT NUMBER EQUIVALENTDUCT PIECES LENGTH x USED = LENGTHRoof Cap 24 Ft. x (1) = 24 Ft.12 Ft. Straight Duct 12 Ft. x (1) = 12 Ft.(6″ Round)Rectangular-to-Round 5 Ft. x (1) = 5 Ft.Transition Adaptor*Equivalent lengths of duct pieces are based on actual tests andreflect requirements for good venting performance with any vent hood. Total Length = 41 Ft.HOOD EXHAUSTThe following chart describes an example of one possibleductwork installation.NOTE: Read these next two pages only if you plan to vent your exhaust to theoutside. If you plan to recirculate the air back into the room, proceed to page 6.OUTSIDE TOP EXHAUST (EXAMPLE ONLY)NOTE: For back exhaust, care should be taken to align exhaust with space between studs, or wall should be preparedat the time it is constructed by leaving enough space between the wall studs to accommodate exhaust.* IMPORTANT: If a rectangular-to-round transition adaptor is used, the bottom corners of the damperwill have to be cut to fit, using the tin snips, in order to allow free movement of the damper.The following chart describes an example of one possibleductwork installation.Installation InstructionsOUTSIDE BACK EXHAUST (EXAMPLE ONLY)EQUIVALENT NUMBER EQUIVALENTDUCT PIECES LENGTH* x USED = LENGTHWall Cap 40 Ft. x (1) = 40 Ft.3 Ft. Straight Duct 3 Ft. x (1) = 3 Ft.(31⁄4″ x 10″ Rectangular)90° Elbow 10 Ft. x (2) = 20 Ft.Equivalent lengths of duct pieces are based on actual tests andreflect requirements for good venting performance with any vent hood. Total Length = 63 Ft.