230:, warm air from the house is pulled up the chimney, while cold air from outside is pulled into the house wherever it can enter, including around leaking windows and doors. Ideally, the flue should be open all the way when the fire is first started, and then adjusted toward closure as the fire burns until it is open just enough to slowly pull smoke from the fire up the chimney. After the flue heats up from the fire, they are easier to move, but also hotter. Hands should be protected when operating the flue lever; and if a new log is added to the fire, the flue must be adjusted again to ensure that smoke does not billow out into the house.
234:
circulation avoids the considerable heat loss to the chimney and outside air in conventional systems. The heat from the flue gases is absorbed quickly by the bricks and then released slowly to the house rather than the chimney. In a well insulated home, a single load fire burning for one and a half hours twice a day is enough to keep an entire home warm for a 24-hour period. In this way, less fuel is used, and noxious emissions are reduced. Sometimes, the flue incorporates a second combustion chamber where combustibles in the flue gas are burnt a second time, reducing soot, noxious emissions and increasing overall efficiency.
310:
contains the smaller flue duct within it. Thus a leak from the inner flue duct will only leak the exhaust into the appliance rather than into a room. However longer runs are possible with two-pipe systems where the flue and air ducts run separately. Instead of using closed flues, some power flues use open flues, taking combustion air from the room housing the appliance. As with all open flues, the provision of adequate ventilation to supply combustion air to such appliances is vitally important.
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Closed flue – When an air duct brings combustion air directly to an appliance, there is no air movement between the room containing the appliance. This makes Room Sealed appliances intrinsically safe, since products of combustion (POCs) cannot normally escape into the room. Two major types of closed
305:
Balanced flue – Use the natural draught created by the hot exhaust, so the flue is as short as possible, usually sufficiently long to pass through an external wall against or near which the appliance is installed. The balanced flue terminal has both flue outlet and air inlet in close proximity, so
309:
Power flue – Fanned flues use the pressure created by a fan to power the movement of outside air into the appliance and combustion products to external air. Thus air and flue ducts can be much longer, of smaller diameter, and include changes of direction. Most ducting is concentric; the air duct
233:
In some countries, wood fire flues are often built into a heat preserving construction within which the flue gases circulate over heat retaining bricks before release to the atmosphere. The heat retaining bricks are covered in a decorative material such as brick, tiles or stone. This flue gas
222:
Flues are adjustable and are designed to release noxious gases to the atmosphere. They often have the disadvantageous effect of releasing useful household heat to the atmosphere when not properly set—the very opposite of why the fire was lit in the first place.
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From simple bird guard chimney cowls that keep out birds and other vermin, to options that are specifically designed to prevent downdraught in chimneys, flues and air ducts such as revolving chimney cowls.
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Fireplaces are one of the biggest energy wasters when the flue is not used properly. This occurs when the flue is left open too wide after the fire is started. Known as
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False flue – While two or three flues may be required for separate heat sources, several "false" flues may be added at the top of a chimney for aesthetic purpose.
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Open flue – An open flued appliance draws combustion air from its surroundings; exhaust gases rise in a vortex up the open flue. The 19th century
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any draughts or wind gusts pressure both equally and cancel out in the appliance. Thus the burner flame and even pilot lights are not affected.
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to the outdoors. Historically the term flue meant the chimney itself. In the United States, they are also known as
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and other dangerous compounds, proper "draft", and admission of replacement air is imperative.
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A seven-flue chimney in a four-storey
Georgian house in London, showing alternative methods of
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Also are chimney cowls, used to increase the draft whilst also preventing backflow of smoke.
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for water heaters and modern furnaces. They usually operate by
32:
436:
Anderson, LeRoy Oscar; Oberschulte, William (12 April 1992).
411:"Flue Types - Description of open, balanced and fanned flues"
385:"Flue Types - Description of open, balanced and fanned flues"
278:
Another use of the term is for the internal flues of a
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is an appliance that elegantly refined this principle.
202:, or the combustion products may be "induced" via a
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1701:
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63:. Unsourced material may be challenged and removed.
482:
254:The term flue is also used to define certain
8:
321:– A flue in a die used in injection molding.
302:flues are used with Room Sealed appliances:
1877:Heating, ventilation, and air conditioning
1249:High efficiency glandless circulating pump
498:Heating, ventilation, and air conditioning
489:
475:
467:
258:, or rather, their construction or style.
123:Learn how and when to remove this message
1683:Mold growth, assessment, and remediation
353:
1556:Programmable communicating thermostat
270:constructed centuries ago had flues.
7:
1678:Mechanical, electrical, and plumbing
360:Oxford English Dictionary. Flue, n3.
61:adding citations to reliable sources
16:Exhaust for a fireplace, furnace etc
1539:Minimum efficiency reporting value
14:
1581:Standard temperature and pressure
1294:Packaged terminal air conditioner
830:Passive daytime radiative cooling
559:Heat pump and refrigeration cycle
206:. As combustion products contain
650:Absorption-compression heat pump
37:
1545:Normal temperature and pressure
925:Vapor-compression refrigeration
48:needs additional citations for
1:
1693:Testing, adjusting, balancing
1637:Building information modeling
1632:Building services engineering
1209:Ground-coupled heat exchanger
737:Demand controlled ventilation
685:Building insulation materials
439:Wood-frame House Construction
1254:High-pressure cut-off switch
805:Ice storage air conditioning
726:Dedicated outdoor air system
1597:Thermostatic radiator valve
1399:Thermostatic radiator valve
910:Underfloor air distribution
845:Radiant heating and cooling
763:Energy recovery ventilation
675:Automobile air conditioning
539:Domestic energy consumption
1895:
1746:Institute of Refrigeration
1627:Architectural technologist
1099:Electrostatic precipitator
442:. Craftsman Book Company.
25:
18:
1799:Volatile organic compound
1658:Environmental engineering
1622:Architectural engineering
1424:Ultra-low particulate air
1009:Automatic balancing valve
937:Variable refrigerant flow
789:Heat recovery ventilation
732:Deep water source cooling
459:– via Google Books.
1846:Template:Home automation
1668:Kitchen exhaust cleaning
1364:Solar-assisted heat pump
964:Air conditioner inverter
743:Displacement ventilation
634:Vapour pressure of water
619:Thermal destratification
26:Not to be confused with
1841:World Refrigeration Day
1688:Refrigerant reclamation
1617:Architectural acoustics
1561:Programmable thermostat
1493:Clean air delivery rate
1389:Thermal expansion valve
1304:Pressurisation ductwork
1214:Ground source heat pump
655:Absorption refrigerator
1831:Glossary of HVAC terms
1793:Sick building syndrome
1673:Mechanical engineering
1384:Smoke exhaust ductwork
815:Mixed-mode ventilation
143:
1851:Template:Solar energy
1529:Intelligent buildings
1488:Carbon dioxide sensor
875:Room air distribution
695:Central solar heating
138:
21:Flue (disambiguation)
1653:Duct leakage testing
1643:Deep energy retrofit
1587:Thermographic camera
1524:Infrared thermometer
999:Air source heat pump
948:Water heat recycling
514:Air changes per hour
290:Flue types include:
198:, also known as the
57:improve this article
19:For other uses, see
1519:HVAC control system
1509:Home energy monitor
1483:Building automation
1269:Inverter compressor
931:Variable air volume
840:Passive ventilation
810:Kitchen ventilation
710:Constant air volume
680:Autonomous building
190:for boilers and as
1782:Indoor air quality
1726:ASTM International
1663:Hydronic balancing
1440:Wood-burning stove
1319:Radiator reflector
1104:Evaporative cooler
915:Underfloor heating
900:Thermal insulation
158:, or opening in a
144:
1859:
1858:
1775:Health and safety
1354:Scroll compressor
1309:Process duct work
1064:Convection heater
1059:Condensing boiler
989:Air-mixing plenum
885:Solar combisystem
721:Cross ventilation
524:Building envelope
417:. 8 December 2005
391:. 8 December 2005
296:Rumford fireplace
133:
132:
125:
107:
1884:
1821:Building science
1576:Smart thermostat
1571:Room temperature
1154:Fireplace insert
860:Radon mitigation
758:Electric heating
753:District heating
748:District cooling
665:Air conditioning
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1816:ASHRAE Handbook
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1788:Passive smoking
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1430:Whole-house fan
1344:Run-around coil
1339:Reversing valve
1284:Mechanical room
1274:Kerosene heater
1264:Infrared heater
1194:Gasoline heater
1134:Fan filter unit
1049:Condensate pump
1034:Centrifugal fan
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855:Radiant heating
850:Radiant cooling
825:Passive cooling
820:Microgeneration
690:Central heating
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614:Thermal comfort
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208:carbon monoxide
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1566:Psychrometrics
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1463:Air flow meter
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1221:
1219:Heat exchanger
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1186:
1184:Gas compressor
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1119:Expansion tank
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1039:Ceramic heater
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880:Solar air heat
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779:Forced-air gas
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371:"JRF Chimneys"
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342:Masonry heater
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1359:Solar chimney
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1129:Fan coil unit
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926:
923:
921:
920:Vapor barrier
918:
916:
913:
911:
908:
906:
903:
901:
898:
896:
895:Solar heating
893:
891:
890:Solar cooling
888:
886:
883:
881:
878:
876:
873:
871:
868:
866:
865:Refrigeration
863:
861:
858:
856:
853:
851:
848:
846:
843:
841:
838:
836:
835:Passive house
833:
831:
828:
826:
823:
821:
818:
816:
813:
811:
808:
806:
803:
801:
798:
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777:
775:
772:
770:
767:
764:
761:
759:
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749:
746:
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741:
738:
735:
733:
730:
727:
724:
722:
719:
717:
714:
711:
708:
706:
705:Chilled water
703:
701:
698:
696:
693:
691:
688:
686:
683:
681:
678:
676:
673:
671:
668:
666:
663:
661:
658:
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645:
641:
635:
632:
630:
627:
625:
622:
620:
617:
615:
612:
610:
607:
605:
604:Sensible heat
602:
600:
597:
595:
592:
590:
587:
585:
584:Noise control
582:
580:
577:
575:
572:
570:
567:
565:
564:Heat transfer
562:
560:
557:
555:
552:
550:
547:
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537:
535:
532:
530:
527:
525:
522:
520:
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469:
451:
449:9780934041744
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403:
390:
386:
380:
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372:
366:
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217:
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197:
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185:
181:
177:
173:
169:
165:
164:exhaust gases
161:
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149:
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137:
127:
124:
116:
105:
102:
98:
95:
91:
88:
84:
81:
77:
74: –
73:
69:
68:Find sources:
62:
58:
52:
51:
46:This article
44:
40:
35:
34:
29:
22:
1826:Fireproofing
1610:and services
1606:Professions,
1504:Gas detector
1404:Trickle vent
1379:Smoke damper
1374:Smoke canopy
1369:Space heater
1299:Plenum space
1234:Heating film
1163:
1114:Exhaust hood
1084:Dehumidifier
1024:Blast damper
1019:Barrier pipe
994:Air purifier
905:Thermosiphon
784:Free cooling
700:Chilled beam
624:Thermal mass
609:Stack effect
594:Particulates
574:Infiltration
505:Fundamental
453:. Retrieved
438:
431:
419:. Retrieved
414:
405:
393:. Retrieved
388:
379:
365:
356:
289:
280:flued boiler
277:
265:
253:
239:
236:
232:
225:
221:
200:stack effect
191:
187:
176:water heater
147:
145:
119:
110:
100:
93:
86:
79:
67:
55:Please help
50:verification
47:
1836:Warm Spaces
1478:Blower door
1456:and control
1454:Measurement
1435:Windcatcher
1409:Trombe wall
1349:Sail switch
1329:Refrigerant
1324:Recuperator
1199:Grease duct
1159:Freeze stat
1144:Fire damper
1014:Back boiler
984:Air ionizer
979:Air handler
943:Ventilation
795:Hybrid heat
660:Air barrier
579:Latent heat
262:Bath-houses
1872:Fireplaces
1866:Categories
1592:Thermostat
1514:Humidistat
1445:Zone valve
1414:TurboSwing
1289:Oil heater
1259:Humidifier
1189:Gas heater
1139:Fan heater
1109:Evaporator
1094:Economizer
1069:Compressor
974:Air filter
957:Components
774:Forced-air
670:Antifreeze
643:Technology
589:Outgassing
529:Convection
415:diynot.com
389:diynot.com
348:References
337:Combustion
286:Flue types
245:Other uses
228:convection
113:March 2014
83:newspapers
1702:Industry
1551:OpenTherm
1229:Heat pump
1224:Heat pipe
1174:Fume hood
1149:Fireplace
1054:Condenser
1004:Attic fan
800:Hydronics
192:breeching
184:generator
168:fireplace
1809:See also
1534:LonWorks
1468:Aquastat
1334:Register
1314:Radiator
969:Air door
769:Firestop
569:Humidity
544:Enthalpy
534:Dilution
519:Bake-out
507:concepts
455:12 April
421:12 April
395:12 April
326:See also
319:Die flue
196:buoyancy
141:sweeping
1608:trades,
1179:Furnace
1044:Chiller
716:Coolant
274:Boilers
268:thermae
172:furnace
166:from a
160:chimney
97:scholar
1761:SMACNA
1721:ASHRAE
1541:(MERV)
1495:(CADR)
1473:BACnet
1426:(ULPA)
1279:Louver
1204:Grille
1079:Damper
1029:Boiler
927:(VCRS)
728:(DOAS)
446:
266:Roman
250:Organs
204:blower
180:boiler
99:
92:
85:
78:
72:"Flue"
70:
1801:(VOC)
1795:(SBS)
1784:(IAQ)
1741:CIBSE
1736:BSRIA
1639:(BIM)
1583:(STP)
1547:(NTP)
1169:Freon
939:(VRF)
933:(VAV)
791:(HRV)
765:(ERV)
739:(DCV)
712:(CAV)
188:vents
182:, or
150:is a
104:JSTOR
90:books
1756:LEED
1716:AMCA
1711:AHRI
1244:HEPA
1164:Flue
1089:Duct
457:2018
444:ISBN
423:2018
397:2018
156:pipe
152:duct
148:flue
76:news
1766:UMC
1751:IIR
1731:BRE
1124:Fan
59:by
28:Flu
1868::
413:.
387:.
282:.
178:,
174:,
170:,
154:,
146:A
490:e
483:t
476:v
425:.
399:.
373:.
126:)
120:(
115:)
111:(
101:·
94:·
87:·
80:·
53:.
30:.
23:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
