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A mounting flange for attaching an HVAC air diffuser terminal in an opening in a floor or other mounting surface. The mounting flange includes a trim ring and a flange clip. The flange clip is adjustably and movably received in a slot defined a side of the trim ring. A pawl on the flange clip engage

A mounting flange for attaching an HVAC air diffuser terminal in an opening in a floor or other mounting surface. The mounting flange includes a trim ring and a flange clip. The flange clip is adjustably and movably received in a slot defined a side of the trim ring. A pawl on the flange clip engages with ratchets defined in a surface of the trim ring adjacent to the slot to maintain the flange clip in selected position relative the underside of a floor. The air diffuser terminal is secured in the floor opening between gripping surfaces on the flange clip and the trim ring. An optional screw operably connects the flange clip with the trim ring so that the diffuser may be securely tightened in the floor opening.

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1. In an air diffuser terminal with a diffuser grille and a basket, a mounting flange for mounting the air diffuser terminal in an opening in a support structure, the mounting flange comprising: a. a trim ring dimensioned to fit the opening in the support structure comprising: i. a periphery extendi

1. In an air diffuser terminal with a diffuser grille and a basket, a mounting flange for mounting the air diffuser terminal in an opening in a support structure, the mounting flange comprising: a. a trim ring dimensioned to fit the opening in the support structure comprising: i. a periphery extending between a top ring opening and a bottom ring opening and having an inside surface and an outside surface, the periphery including: 1. a lip extending outwardly from the periphery of the trim ring adjacent the top ring opening for engaging one surface of the mounting structure;2. a vertical track comprising an open ended, vertically extending slot formed in the periphery and, extending from below the lip of the trim ring, to the bottom ring opening and intersecting with the bottom ring opening; and3. a ratchet formed on a portion of the periphery of the trim ring adjacent the slot; andb. a flange clip comprising: i. an extending arm carried by the flange clip for engaging an opposite surface of the mounting structure;ii. an attachment structure comprising a groove for engaging and sliding along the open ended, vertically extending slot of the vertical track; andiii. a flexible pawl for engaging the ratchet on the open ended vertical slot, the pawl being accessible from inside the trim ring through the open ended, vertically extending slot, wherein the flange clip moves along the vertical track into engagement with the opposite surface of the support structure and is locked in place by the ratchet and pawl to capture the support structure between the lip of the trim ring and the extending arm of the flange clip and wherein the flexible pawl flexes away from the ratchet to withdraw the flexible pawl from engagement with the ratchet. 2. The mounting flange of claim 1, wherein the ratchet is on the outer surface of the trim ring adjacent the vertical slot. 3. The mounting flange of claim 1, wherein the ratchet is on the inner surface of the trim ring adjacent the vertical slot. 4. The mounting flange of claim 1, wherein ratchet is on the inwardly facing surface on the trim ring of the vertical slot. 5. The mounting flange of claim 1, wherein the flange clip comprises a left pawl and a right pawl, and each pawl engages a ratchet on a corresponding left side and right side of the vertical slot. 6. The mounting flange of claim 1, wherein the flange clip further comprises at least one tab connected to the flexible pawl and operable to disengage the flexible pawl from the ratchet. 7. The mounting flange of claim 1, wherein the ratchet has a predetermined range of length corresponding to a thickness of the support structure in which the diffuser is mounted. 8. The mounting flange of claim 1, wherein the mounting flange further comprises a screw extending through the lip and rotatably coupled with the flange clip, wherein rotation of the screw in a first direction draws the flange clip upwardly along the slot. 9. The mounting flange of claim 8, wherein the screw is at an angle to the vertical and is connected to the flange clip by a threaded cylinder and a trunion mounted between a pair of flange clip arms. 10. An air diffuser terminal for mounting in an opening in a support structure comprising: a. a diffuser grille;b. a basket; andc. a mount flange, of the mounting flange comprising: i. a trim ring dimensioned to fit the opening in the support structure comprising: 1. a periphery extending between a top ring opening and a bottom ring opening and having an inside surface and an outside surface, the periphery including: a. a lip extending outwardly from the periphery of the trim ring adjacent the top ring opening for engaging one surface of the mounting structure;b. a vertical track comprising an open ended, vertically extending slot formed in the periphery and extending from below the lip of the trim ring to the bottom ring opening and intersecting with the bottom ring opening; andc. a ratchet formed on a portion of the periphery of the trim ring adjacent the slot; andii. a flange clip comprising: 1. an extending arm carried by the flange clip for engaging an opposite surface of the mounting structure;2. an attachment structure comprising a groove for engaging and sliding along the open ended, vertically extending slot of the vertical track; and3. a flexible pawl for engaging the ratchet on the open ended, vertically extending slot, the pawl being accessible from inside the trim through the vertical slot, wherein the flange clip moves along the vertical track into engagement with the opposite surface of the support structure and is locked in place by the ratchet and pawl to capture the support structure between the lip of the trim ring and the extending arm of the flange clip and wherein the flexible pawl flexes away from the ratchet to withdraw the flexible pawl from engagement with the ratchet. 11. The air diffuser terminal of claim 10, wherein the ratchet is on the outer surface of the trim ring adjacent the vertical slot. 12. The air diffuser terminal of claim 10, wherein the ratchet is on the inner surface of the trim ring adjacent the vertical slot. 13. The air diffuser terminal of claim 10, wherein the ratchet is on the inwardly facing surface on the trim ring of the vertical slot. 14. The air diffuser terminal of claim 10, wherein the flange clip comprises a left pawl and a right pawl, and each pawl engages a ratchet on a corresponding left side and right side of the vertical slot. 15. The air diffuser terminal of claim 10, wherein the flange clip further comprises at least one tab connected to the flexible pawl and operable to disengage the flexible pawl from the ratchet. 16. The air diffuser terminal of claim 10, wherein the ratchet has a predetermined range of length corresponding to a thickness of the support structure in which the diffuser is mounted. 17. The air diffuser terminal of claim 10, wherein the mounting flange further comprises a screw extending through the lip and rotatably coupled with the flange clip, wherein rotation of the screw in a first direction draws the flange clip upwardly along the slot. 18. The air diffuser terminal of claim 17, wherein the screw is at an angle to the vertical and is connected to the flange clip by a threaded cylinder and a trunion mounted between a pair of flange clip arms. 19. In an air diffuser terminal with a diffuser grille and a basket, a mounting flange for mounting the air diffuser terminal in an opening in a support structure, the mounting flange comprising: a. a trim ring dimensioned to fit the opening comprising: i. a lip extending outwardly from the trim ring for engaging one surface of the mounting structure;ii. a vertical track comprising a vertical slot, an outer surface, an inner surface, and an inwardly facing surface extending below the lip of the trim ring; andiii. a ratchet formed on a portion of the trim ring adjacent the slot; andb. a flange clip comprising: i. an extending arm carried by the flange clip for engaging an opposite surface of the mounting structure;ii. an attachment structure comprising a groove for engaging and sliding along the vertical slot of the vertical track; andiii. a flexible pawl for engaging the ratchet on the vertical slot, wherein the flange clip moves along the vertical track into engagement with the opposite surface of the support structure and is locked in place by the ratchet and pawl to capture the support structure between the lip of the trim ring and the extending arm of the flange clip, wherein the flexible pawl flexes away from the ratchet to withdraw the flexible pawl from engagement with the ratchet, wherein the mounting flange further comprises a screw extending through the lip and rotatably coupled with the flange clip, wherein rotation of the screw in a first direction draws the flange clip upwardly along the slot, and wherein the screw is at an angle to the vertical and is connected to the flange clip by a threaded cylinder and a trunion mounted between a pair of flange clip arms. 20. The mounting flange of claim 19, wherein the ratchet is on the outer surface of the trim ring adjacent the vertical slot. 21. The mounting flange of claim 19, wherein the ratchet is on the inner surface of the trim ring adjacent the vertical slot. 22. The mounting flange of claim 19, wherein ratchet is on the inwardly facing surface on the trim ring of the vertical slot. 23. The mounting flange of claim 19, wherein the flange clip comprises a left pawl and a right pawl, and each pawl engages a ratchet on a corresponding left side and right side of the vertical slot. 24. The mounting flange of claim 19, wherein the flange clip further comprises at least one tab connected to the flexible pawl and operable to disengage the flexible pawl from the ratchet. 25. The mounting flange of claim 19, wherein the ratchet has a predetermined range of length corresponding to a thickness of the support structure. 26. An air diffuser terminal for mounting in an opening in a support structure comprising: a. a diffuser grille;b. a basket; andc. a mount flange, of the mounting flange comprising: i. a trim ring dimensioned to fit the opening comprising: 1. a lip extending outwardly from the trim ring for engaging one surface of the mounting structure;2. a vertical track comprising a vertical slot, an outer surface, an inner surface, and an inwardly facing surface extending below the lip of the trim ring; and3. a ratchet formed on a portion of the trim ring adjacent the slot; andii. a flange clip comprising: 1. an extending arm carried by the flange clip for engaging an opposite surface of the mounting structure;2. an attachment structure comprising a groove for engaging and sliding along the vertical slot of the vertical track; and3. a flexible pawl for engaging the ratchet on the vertical slot, wherein the flange clip moves along the vertical track into engagement with the opposite surface of the support structure and is locked in place by the ratchet and pawl to capture the support structure between the lip of the trim ring and the extending arm of the flange clip, wherein the flexible pawl flexes away from the ratchet to withdraw the flexible pawl from engagement with the ratchet, wherein the mounting flange further comprises a screw extending through the lip and rotatably coupled with the flange clip, wherein rotation of the screw in a first direction draws the flange clip upwardly along the slot, and wherein the screw is at an angle to the vertical and is connected to the flange clip by a threaded cylinder and a trunion mounted between a pair of flange clip arms. 27. The air diffuser terminal of claim 26, wherein the ratchet is on the outer surface of the trim ring adjacent the vertical slot. 28. The air diffuser terminal of claim 26, wherein the ratchet is on the inner surface of the trim ring adjacent the vertical slot. 29. The air diffuser terminal of claim 26, wherein the ratchet is on the inwardly facing surface on the trim ring of the vertical slot. 30. The air diffuser terminal of claim 26, wherein the flange clip comprises a left pawl and a right pawl, and each pawl engages a ratchet on a corresponding left side and right side of the vertical slot. 31. The air diffuser terminal of claim 26, wherein the flange clip further comprises at least one tab connected to the flexible pawl and operable to disengage the flexible pawl from the ratchet. 32. The air diffuser terminal of claim 26, wherein the ratchet has a predetermined range of length corresponding to a thickness of the support structure in which the diffuser is mounted.