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A frame assembly for a doorway defined by two substantially vertical sides and a substantially horizontal side comprises a header jamb having a top surface, a bottom surface, and one or two header jamb rebates. The top surface of the head jamb is adapted for fixedly mounting to the substantially hor

A frame assembly for a doorway defined by two substantially vertical sides and a substantially horizontal side comprises a header jamb having a top surface, a bottom surface, and one or two header jamb rebates. The top surface of the head jamb is adapted for fixedly mounting to the substantially horizontal side of the doorway and the header jamb rebates located on the bottom surface across the length of the header jamb define a header soffit. The frame assembly comprises two upright jambs each having an outer surface and a top end. The outer surface of each of the upright jambs is adapted for fixedly mounting to one of the two substantially vertical sides of the doorway. The top end of each of the upright jambs have a slot for receiving a portion of the header soffit such that, when assembled, the header soffit engages in the slots.

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1. A kit of disassembled door frame parts that assemble to form a slidably adjustable frame assembly for sizing to fit different sized doorway openings, comprising: a header jamb consisting of, as a single piece, a top surface that is flat and continuous, a bottom surface that is longitudinally cont

1. A kit of disassembled door frame parts that assemble to form a slidably adjustable frame assembly for sizing to fit different sized doorway openings, comprising: a header jamb consisting of, as a single piece, a top surface that is flat and continuous, a bottom surface that is longitudinally continuous, and one or two header jamb rebates extending a length of the header jamb, the top surface of the header jamb being adapted for fixedly mounting to the substantially horizontal side of the doorway, the one or two header jamb rebates located on the bottom surface across the length of the header jamb, the bottom surface defining a header soffit extending the length of the header jamb; andtwo upright jambs each consisting of, as a single piece, an outer surface and a top end, the outer surface of each of the upright jambs being adapted for fixedly mounting to one of the two substantially vertical sides of the doorway, the header jamb and the upright jambs being substantially the same in profile and construction and constructed of continuous lengths, wherein each of the upright jambs has an inner surface, a bottom end, and one or two upright rebates in the inner surface extending from the top end to the bottom end, the one or two upright rebates corresponding to the one or two header jamb rebates and having generally the same cross section,wherein the header jamb and the two upright jambs are adapted to be provided as a single jamb with the one or two rebates as required, the top end of each of the upright jambs having a slot for slidably receiving spaced apart portions of the header soffit such that in an assembled condition the header soffit engages in the slots and the upright rebates and the header jamb rebate form a continuous door recess engageable with a door when in a closed position, and wherein in an assembled condition the upright jambs are movable relative to each other over the header soffit to adjust the width of the doorway. 2. The kit according to claim 1, further comprising one or more auxiliary upright jambs, wherein in an assembled condition the one or more auxiliary upright jambs are disposed between the upright jambs, the header jamb and the upright jambs and being substantially the same in profile and construction and constructed of continuous single piece lengths of wood; each of the one or more auxiliary upright jambs consisting of an auxiliary top end with an auxiliary slot for receiving a portion of the header soffit, a side surface, an auxiliary bottom end and one or two auxiliary rebates in the side surface extending from the auxiliary top end to the auxiliary bottom end, the one or two auxiliary rebates corresponding to the one or two header jamb rebates and having generally the same cross-section such that when assembled the header soffit engages in the auxiliary slots. 3. A method for assembling a slidably adjustable frame assembly for sizing to fit different sized doorway openings comprising: assembling the header jamb and two upright jambs and one or more auxiliary upright jambs comprising the kit according to claim 2,sliding one of the two upright jambs relative to the other over the header soffit to adjust a width of the doorway to fit the doorway opening measurements,removing excess header soffit from the assembly following adjustment substantially without disassembly of the header soffit from the uprights, andsecuring the uprights and optional auxiliary uprights and header soffit to the doorway. 4. The method according to claim 3, wherein the header jamb and the two upright jambs are formed as a single jamb with one or two rebates as required and cut to appropriate lengths of the header jamb and the two upright jambs and the slot formed in a top end of the two upright jambs for receiving the header soffit in the slots. 5. The method according to claim 3, wherein one or two upright rebates of at least one of the upright jambs and corresponding one or two header jamb rebates define corresponding one or two door recesses. 6. The method according to claim 3, wherein one or two auxiliary rebates of at least one of the one or more auxiliary upright jambs and corresponding one or two header jamb rebates define corresponding one or two auxiliary door recesses. 7. A slidably adjustable frame assembly assembled by the method according to claim 3. 8. A method for assembling a slidably adjustable frame assembly for sizing to fit different sized doorway openings, the method comprising: providing the disassembled parts of the kit according to claim 1, assembling the header jamb and two upright jambs,sliding one of the two upright jambs relative to the other over the header soffit to adjust a width of the doorway to fit the doorway opening measurements,removing excess header soffit from the assembly following adjustment substantially without disassembly of the header soffit from the uprights, andsecuring the uprights and header soffit to the doorway. 9. A slidably adjustable frame assembly assembled by the method according to claim 8. 10. The adjustable frame assembly according to claim 9, wherein the header jamb and the two upright jambs are formed as a single jamb with one or two rebates as required and cut to appropriate lengths of the header jamb and the two upright jambs and the slot formed in a top end of the two upright jambs for receiving the header soffit in the slots. 11. The adjustable frame assembly according to claim 9, wherein one or two upright rebates of at least one of the upright jambs and corresponding one or two header jamb rebates define corresponding one or two door recesses.