| F | SK | MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING |
| F23 | KL | COMBUSTION APPARATUS; COMBUSTION PROCESSES |
| F23H | UKL | GRATES (inlets for fluidisation air for fluidised bed combustion apparatus F23C 10/20); CLEANING OR RAKING GRATES |
| F23H 1/00 | HGR | Grates with solid bars |
| F23H 1/02 | UGR1 | | . | having provision for air supply or air preheating, e.g. air-supply or blast fittings which form part of the grate structure or serve as supports |
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| F23H 1/04 | UGR1 | | . | having a variable burning surface |
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| F23H 1/06 | UGR1 | | . | having bars at different levels (double grates F23H 5/00) |
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| F23H 1/08 | UGR1 | |
| F23H 3/00 | HGR | Grates with hollow bars |
| F23H 3/02 | UGR1 | |
| F23H 3/04 | UGR1 | | . | externally cooled, e.g. with water, steam, or air |
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| F23H 5/00 | HGR | Double grates |
| F23H 7/00 | HGR | Inclined grates (inclined travelling grates F23H 11/12) |
| F23H 7/02 | UGR1 | |
| F23H 7/04 | UGR2 | | . . | in parallel disposition |
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| F23H 7/06 | UGR1 | | . | with movable bars disposed parallel to direction of fuel feeding |
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| F23H 7/08 | UGR2 | | . . | reciprocating along their axes |
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| F23H 7/10 | UGR2 | | . . | rocking about their axes |
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| F23H 7/12 | UGR1 | | . | with movable bars disposed transversely to direction of fuel feeding |
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| F23H 7/14 | UGR2 | | . . | reciprocating along their axes |
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| F23H 7/16 | UGR2 | | . . | rocking about their axes |
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| F23H 7/18 | UGR2 | | . . | reciprocating in an upward direction |
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| F23H 9/00 | HGR | Revolving grates; Rocking grates (F23H 7/00 takes precedence) |
| F23H 9/02 | UGR1 | | . | Revolving cylindrical grates |
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| F23H 9/04 | UGR1 | | . | Grates rocked as a whole |
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| F23H 9/06 | UGR1 | | . | the bars being rocked about axes transverse to their lengths |
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| F23H 9/08 | UGR1 | | . | the bars being rocked about their longitudinal axes |
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| F23H 9/10 | UGR2 | | . . | and modified to move fuel along the grate |
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| F23H 9/12 | UGR1 | | . | the bars being vertically movable in a plane |
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| F23H 11/00 | HGR | Travelling grates |
| F23H 11/02 | UGR1 | | . | with the bars disposed on transverse bearers |
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| F23H 11/04 | UGR1 | | . | with the bars pivoted at one side |
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| F23H 11/06 | UGR1 | | . | with the bars movable relatively to one another |
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| F23H 11/08 | UGR1 | | . | with several individually-movable grate surfaces |
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| F23H 11/10 | UGR1 | | . | with special provision for supply of air from below and for regulating air supply |
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| F23H 11/12 | UGR1 | | . | inclined travelling grates; Stepped travelling grates |
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| F23H 11/14 | UGR1 | | . | serving as auxiliary grates |
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| F23H 11/16 | UGR1 | |
| F23H 11/18 | UGR1 | |
| F23H 11/20 | UGR2 | |
| F23H 11/22 | UGR2 | | . . | Moving fuel along grate; Cleaning of grate |
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| F23H 11/24 | UGR2 | | . . | Removal of ashes; Removal of clinker |
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| F23H 11/26 | UGR3 | |
| F23H 11/28 | UGR2 | | . . | Replaceable burning-surface |
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| F23H 13/00 | HGR | Grates not covered by any preceding group |
| F23H 13/02 | UGR1 | | . | Basket grates, e.g. with shaking arrangement |
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| F23H 13/04 | UGR1 | |
| F23H 13/06 | UGR1 | |
| F23H 13/08 | UGR1 | | . | Grates specially adapted for gas generators and also applicable to furnaces |
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| F23H 15/00 | HGR | Cleaning arrangements for grates (not forming part of the grate F23J 1/00); Moving fuel along grate (rocking grates modified for moving fuel F23H 9/10; for travelling grates F23H 11/22) |
| F23H 17/00 | HGR | Details of grates |
| F23H 17/02 | UGR1 | |
| F23H 17/04 | UGR2 | |
| F23H 17/06 | UGR1 | | . | Provision for vertical adjustment of grate |
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| F23H 17/08 | UGR1 | | . | Bearers; Frames; Spacers; Supports |
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| F23H 17/10 | UGR2 | | . . | Dead plates; Imperforate fuel supports |
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| F23H 17/12 | UGR1 | |