F
SECTION F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  
ENGINES AND PUMPS
 F01
MACHINES OR ENGINES IN GENERAL (combustion engines F02; machines for liquids F03, F04); ENGINE PLANTS IN GENERAL; STEAM ENGINES
 F01N
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL-COMBUSTION ENGINES (combustion-air intake silencers specially adapted for, or arranged on, internal-combustion engines F02M 35/00; protecting against, or damping, noise in general G10K 11/16)
 F01N

Note(s)

Attention is drawn to the notes preceding class F01, especially as regards Note 2 (b).

 F01N 1/00
Silencing apparatus characterised by method of silencing
 F01N 1/02
·  by using resonance
 F01N 1/04
·  ·  having sound-absorbing materials in resonance chambers
 F01N 1/06
·  by using interference effect
 F01N 1/08
·  by reducing exhaust energy by throttling or whirling
 F01N 1/10
·  ·  in combination with sound-absorbing materials
 F01N 1/12
·  ·  using spirally- or helically-shaped channels (F01N 1/10 takes precedence; cyclones B04C)
 F01N 1/14
·  by adding air to exhaust gases
 F01N 1/16
·  by using movable parts
 F01N 1/18
·  ·  having rotary movement
 F01N 1/20
·  ·  having oscillating or vibrating movement (the parts being resilient walls F01N 1/22)
 F01N 1/22
·  ·  the parts being resilient walls
 F01N 1/24
·  by using sound-absorbing materials (F01N 1/04, F01N 1/06, F01N 1/10, F01N 1/14, F01N 1/16 take precedence)
 F01N 3/00
Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
 F01N 3/02
·  for cooling, or for removing solid constituents of, exhaust
 F01N 3/04
·  ·  using liquids
 F01N 3/06
·  for extinguishing sparks
 F01N 3/08
·  for rendering innocuous
 F01N 3/10
·  ·  by thermal or catalytic conversion of noxious components of exhaust (by using other chemical processes, chemical aspects of catalytic conversion, e.g. using specified catalysts, B01D 53/34)
 F01N 3/12 - 
F01N 3/16
( transferred to F01N 3/10,F01N 3/18-F01N 3/38, B01D )
 F01N 3/18
·  ·  ·  characterised by methods of operation; Regulation  [3]
 F01N 3/20
·  ·  ·  ·  specially adapted for catalytic conversion (F01N 3/22 takes precedence)  [3]
 F01N 3/22
·  ·  ·  ·  Regulation of additional air supply only, e.g. using by-passes or variable air pump drives  [3]
 F01N 3/24
·  ·  ·  characterised by constructional aspects of converting apparatus  [3]
 F01N 3/26
·  ·  ·  ·  Construction of thermal reactors  [3]
 F01N 3/28
·  ·  ·  ·  Construction of catalytic reactors  [3]
 F01N 3/30
·  ·  ·  ·  Arrangements for supply of additional air (regulation, e.g. using by-passes or variable air pump drives, F01N 3/22)  [3]
 F01N 3/32
·  ·  ·  ·  ·  using air pumps (using jet air pumps F01N 3/34; pumps in general F04)  [3]
 F01N 3/34
·  ·  ·  ·  ·  using air conduits or jet air pumps, e.g. near the engine exhaust port  [3]
 F01N 3/36
·  ·  ·  ·  Arrangements for supply of additional fuel  [3]
 F01N 3/38
·  ·  ·  ·  Arrangements for igniting  [3]
 F01N 5/00
Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy (predominant aspects of such devices, see the relevant classes for the devices; using kinetic or wave energy of exhaust gases in exhaust systems for charging F02B)
 F01N 5/02
·  the devices using heat
 F01N 5/04
·  the devices using kinetic energy
 F01N 7/00
Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N 1/00-F01N 5/00
 F01N 7/02
·  Apparatus having two or more separate silencers in series
 F01N 7/04
·  Apparatus having two or more silencers in parallel, e.g. having interconnections for multi-cylinder engines
 F01N 7/06
·  specially adapted for star-arrangement of cylinders, e.g. exhaust manifolds
 F01N 7/08
·  Other arrangements or adaptations of exhaust conduits (pipes in general F16L)
 F01N 7/10
·  ·  of exhaust manifolds
 F01N 7/12
·  specially adapted for submerged exhausting
 F01N 7/14
·  having thermal insulation
 F01N 7/16
·  Selection of particular materials
 F01N 7/18
·  Construction facilitating manufacture, assembly, or disassembly
 F01N 7/20
·  Flared outlets, e.g. of fish-tail shape