156:
While the lowest MERV value in each row has no minimum requirement for filtering the particle size for that row, it does have stricter requirements for all larger particle sizes than any lower MERV value. For example, MERV 13 has no minimum requirement for removing 0.3–1.0 μm particles (the standard
73:. The MERV value is from 1 to 16. Higher MERV values correspond to a greater percentage of particles captured on each pass, with a MERV 16 filter capturing more than 95% of particles over the full range. The following table is a grouping of MERV values by particle size:
157:
specifies <75%) but has higher minimum requirements for removing 1.0–3.0 μm, 3.0–10.0 μm, and > 10 μm particles than MERV 12 and all lower MERV values. All other MERV values on each row do have minimum removal percentages for that row's particle size.
172:
scale is known as filter performance rating (FPR), and is reduced from a 1–10 scale to only 4, 7, 9, and 10. It measures ability to capture large particles, small particles, and weight change over the lifetime of the filter.
1727:
1677:
57:
the dense filter material causes. Experiments indicate that less obstructive, medium-efficiency filters of MERV 7 to 13 are almost as effective as true HEPA filters at removing
1707:
1843:
1722:
187:
Although the standards measure slightly different attributes and thus, are not strictly convertible, one retailer reported the following typical equivalents:
1215:
464:
50:
1717:
1649:
1522:
318:
1682:
1644:
368:
69:
The MERV scale is designed to represent the worst-case performance of a filter when dealing with particles in the range of 0.3 to 10
1547:
1260:
796:
525:
616:
181:
398:
1697:
1511:
891:
455:
37:, is a measurement scale designed in 1987 by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (
1848:
1659:
1603:
1598:
1175:
703:
1220:
771:
692:
651:
145:
Bacteria, droplet nuclei (sneeze), cooking oil, most smoke and insecticide dust, most face powder, most paint pigments
1563:
1365:
876:
811:
729:
641:
505:
1712:
1593:
1300:
1065:
909:
1765:
1624:
1588:
1390:
1020:
975:
903:
755:
698:
261:
1812:
1634:
1330:
930:
709:
600:
585:
255:
1807:
1732:
1654:
1583:
1527:
1459:
1355:
1270:
1180:
1145:
621:
288:
Standard 62.1-2007 requires a filter of at least MERV 6 efficiency for residential applications in the U.S.
117:
Mold spores, dust mite debris, cat and dog dander, hair spray, fabric protector, dusting aids, pudding mix
1797:
1759:
1639:
1350:
781:
1817:
1495:
1454:
1170:
841:
661:
319:"Interpreting Filter Performance: The meaning behind the terminology of ASHRAE standards 52.1 and 52.2"
1838:
1619:
1609:
1553:
1490:
1385:
965:
914:
480:
131:
Legionella, humidifier dust, lead dust, milled flour, auto emission particulates, nebulizer droplets
1485:
1475:
1449:
1235:
897:
806:
776:
676:
646:
540:
500:
329:
1748:
1692:
1629:
1406:
1285:
1280:
1070:
881:
866:
448:
1320:
1275:
1030:
1025:
955:
851:
687:
490:
433:
412:
1787:
1542:
1537:
1120:
826:
724:
719:
714:
631:
375:
1782:
1754:
1396:
1310:
1305:
1250:
1240:
1230:
1160:
1100:
1015:
1000:
821:
816:
791:
786:
656:
580:
45:
in more detail than other ratings. For example, often a high-efficiency particulate air (
1532:
1429:
1205:
1185:
1150:
1085:
1005:
846:
836:
745:
595:
565:
520:
515:
1832:
1614:
1465:
1360:
1325:
1095:
1090:
1045:
1040:
886:
861:
856:
831:
801:
671:
570:
550:
530:
441:
54:
1792:
1470:
1370:
1345:
1340:
1335:
1265:
1200:
1080:
1050:
990:
985:
960:
871:
750:
666:
590:
575:
560:
103:, cockroach debris, sanding dust, spray paint dust, textile fibers, carpet fibers
1802:
1444:
1401:
1375:
1315:
1295:
1290:
1165:
1125:
1110:
1055:
980:
950:
945:
761:
626:
545:
42:
1558:
1480:
1411:
1380:
1255:
1225:
1155:
1105:
1075:
1060:
1035:
940:
740:
636:
555:
495:
264:(ULPA), a type of air filter that can remove particles larger than 120 nm
169:
100:
70:
1517:
1195:
1190:
1140:
1115:
970:
766:
427:
369:"Residential Air Cleaners (2nd Edition): A Summary of Available Information"
303:
1500:
1434:
935:
735:
535:
510:
485:
58:
1010:
682:
1687:
1439:
1245:
995:
285:
184:(MPR) and measures the ability to filter particles 0.3 to 1 microns.
38:
17:
1702:
1135:
1210:
1130:
281:
46:
437:
134:
Superior residential, better commercial, hospital laboratories
165:
Two proprietary scales are used to rate sub-HEPA air filters.
120:
Better residential, general commercial, industrial workspaces
177:
304:"Industrial Filters (Eurovent and ASHRAE Classifications)"
27:
Measurement scale for the effectiveness of air filters
1775:
1741:
1668:
1572:
1420:
923:
609:
471:
75:
49:) filter is impractical in residential central
449:
8:
408:
406:
1844:Heating, ventilation, and air conditioning
1216:High efficiency glandless circulating pump
465:Heating, ventilation, and air conditioning
456:
442:
434:
51:heating, ventilation, and air conditioning
1650:Mold growth, assessment, and remediation
189:
353:
274:
61:within residential air handling units.
1523:Programmable communicating thermostat
363:
361:
359:
357:
7:
1645:Mechanical, electrical, and plumbing
413:MERV vs. MPR vs. FPR Rating Systems
1506:Minimum efficiency reporting value
31:Minimum Efficiency Reporting Value
25:
1548:Standard temperature and pressure
1261:Packaged terminal air conditioner
797:Passive daytime radiative cooling
526:Heat pump and refrigeration cycle
41:) to report the effectiveness of
617:Absorption-compression heat pump
317:Newell, Donald (February 2006).
182:microparticle performance rating
85:Typical controlled contaminant
53:(HVAC) systems due to the large
1512:Normal temperature and pressure
892:Vapor-compression refrigeration
258:, a do-it-yourself air purifier
399:Best Air Filters for Your Home
1:
1660:Testing, adjusting, balancing
1604:Building information modeling
1599:Building services engineering
1176:Ground-coupled heat exchanger
704:Demand controlled ventilation
652:Building insulation materials
106:Residential window A-C units
1221:High-pressure cut-off switch
772:Ice storage air conditioning
693:Dedicated outdoor air system
302:M.N.Rama Rao & Company.
137:
123:
109:
91:
1564:Thermostatic radiator valve
1366:Thermostatic radiator valve
877:Underfloor air distribution
812:Radiant heating and cooling
730:Energy recovery ventilation
642:Automobile air conditioning
506:Domestic energy consumption
1865:
1713:Institute of Refrigeration
1594:Architectural technologist
1066:Electrostatic precipitator
1766:Volatile organic compound
1625:Environmental engineering
1589:Architectural engineering
1391:Ultra-low particulate air
976:Automatic balancing valve
904:Variable refrigerant flow
756:Heat recovery ventilation
699:Deep water source cooling
262:Ultra-low particulate air
1813:Template:Home automation
1635:Kitchen exhaust cleaning
1331:Solar-assisted heat pump
931:Air conditioner inverter
710:Displacement ventilation
601:Vapour pressure of water
586:Thermal destratification
428:Indoor Air Quality (IAQ)
1808:World Refrigeration Day
1655:Refrigerant reclamation
1584:Architectural acoustics
1528:Programmable thermostat
1460:Clean air delivery rate
1356:Thermal expansion valve
1271:Pressurisation ductwork
1181:Ground source heat pump
622:Absorption refrigerator
1798:Glossary of HVAC terms
1760:Sick building syndrome
1640:Mechanical engineering
1351:Smoke exhaust ductwork
782:Mixed-mode ventilation
207:(below lowest rating)
82:Minimum particle size
1818:Template:Solar energy
1496:Intelligent buildings
1455:Carbon dioxide sensor
842:Room air distribution
662:Central solar heating
374:. EPA. Archived from
88:Typical application
1849:Indoor air pollution
1620:Duct leakage testing
1610:Deep energy retrofit
1554:Thermographic camera
1491:Infrared thermometer
966:Air source heat pump
915:Water heat recycling
481:Air changes per hour
33:, commonly known as
1486:HVAC control system
1476:Home energy monitor
1450:Building automation
1236:Inverter compressor
898:Variable air volume
807:Passive ventilation
777:Kitchen ventilation
677:Constant air volume
647:Autonomous building
381:on February 1, 2013
256:Corsi–Rosenthal Box
114:10.0–3.0 μm ("E3")
1749:Indoor air quality
1693:ASTM International
1630:Hydronic balancing
1407:Wood-burning stove
1286:Radiator reflector
1071:Evaporative cooler
882:Underfloor heating
867:Thermal insulation
180:scale is known as
142:1.0–0.3 μm ("E1")
128:3.0–1.0 μm ("E2")
1826:
1825:
1742:Health and safety
1321:Scroll compressor
1276:Process duct work
1031:Convection heater
1026:Condensing boiler
956:Air-mixing plenum
852:Solar combisystem
688:Cross ventilation
491:Building envelope
247:
246:
154:
153:
16:(Redirected from
1856:
1788:Building science
1543:Smart thermostat
1538:Room temperature
1121:Fireplace insert
827:Radon mitigation
725:Electric heating
720:District heating
715:District cooling
632:Air conditioning
458:
451:
444:
435:
415:
410:
401:
396:
390:
389:
387:
386:
380:
373:
365:
343:
341:
340:
334:
328:. Archived from
326:HPAC Engineering
323:
313:
311:
310:
289:
279:
190:
150:general surgery
76:
21:
1864:
1863:
1859:
1858:
1857:
1855:
1854:
1853:
1829:
1828:
1827:
1822:
1783:ASHRAE Handbook
1771:
1755:Passive smoking
1737:
1670:
1664:
1576:
1574:
1568:
1422:
1416:
1397:Whole-house fan
1311:Run-around coil
1306:Reversing valve
1251:Mechanical room
1241:Kerosene heater
1231:Infrared heater
1161:Gasoline heater
1101:Fan filter unit
1016:Condensate pump
1001:Centrifugal fan
919:
822:Radiant heating
817:Radiant cooling
792:Passive cooling
787:Microgeneration
657:Central heating
605:
581:Thermal comfort
473:
467:
462:
424:
419:
418:
411:
404:
397:
393:
384:
382:
378:
371:
367:
366:
355:
350:
338:
336:
332:
321:
316:
308:
306:
301:
298:
293:
292:
280:
276:
271:
252:
163:
149:
67:
28:
23:
22:
15:
12:
11:
5:
1862:
1860:
1852:
1851:
1846:
1841:
1831:
1830:
1824:
1823:
1821:
1820:
1815:
1810:
1805:
1800:
1795:
1790:
1785:
1779:
1777:
1773:
1772:
1770:
1769:
1763:
1757:
1752:
1745:
1743:
1739:
1738:
1736:
1735:
1730:
1725:
1720:
1715:
1710:
1705:
1700:
1695:
1690:
1685:
1680:
1674:
1672:
1666:
1665:
1663:
1662:
1657:
1652:
1647:
1642:
1637:
1632:
1627:
1622:
1617:
1612:
1607:
1601:
1596:
1591:
1586:
1580:
1578:
1570:
1569:
1567:
1566:
1561:
1556:
1551:
1545:
1540:
1535:
1533:Psychrometrics
1530:
1525:
1520:
1515:
1509:
1503:
1498:
1493:
1488:
1483:
1478:
1473:
1468:
1463:
1457:
1452:
1447:
1442:
1437:
1432:
1430:Air flow meter
1426:
1424:
1418:
1417:
1415:
1414:
1409:
1404:
1399:
1394:
1388:
1383:
1378:
1373:
1368:
1363:
1358:
1353:
1348:
1343:
1338:
1333:
1328:
1323:
1318:
1313:
1308:
1303:
1298:
1293:
1288:
1283:
1278:
1273:
1268:
1263:
1258:
1253:
1248:
1243:
1238:
1233:
1228:
1223:
1218:
1213:
1208:
1206:Heating system
1203:
1198:
1193:
1188:
1186:Heat exchanger
1183:
1178:
1173:
1168:
1163:
1158:
1153:
1151:Gas compressor
1148:
1143:
1138:
1133:
1128:
1123:
1118:
1113:
1108:
1103:
1098:
1093:
1088:
1086:Expansion tank
1083:
1078:
1073:
1068:
1063:
1058:
1053:
1048:
1043:
1038:
1033:
1028:
1023:
1018:
1013:
1008:
1006:Ceramic heater
1003:
998:
993:
988:
983:
978:
973:
968:
963:
958:
953:
948:
943:
938:
933:
927:
925:
921:
920:
918:
917:
912:
907:
901:
895:
889:
884:
879:
874:
869:
864:
859:
854:
849:
847:Solar air heat
844:
839:
837:Renewable heat
834:
829:
824:
819:
814:
809:
804:
799:
794:
789:
784:
779:
774:
769:
764:
759:
753:
748:
746:Forced-air gas
743:
738:
733:
727:
722:
717:
712:
707:
701:
696:
690:
685:
680:
674:
669:
664:
659:
654:
649:
644:
639:
634:
629:
624:
619:
613:
611:
607:
606:
604:
603:
598:
596:Thermodynamics
593:
588:
583:
578:
573:
568:
566:Psychrometrics
563:
558:
553:
548:
543:
538:
533:
528:
523:
521:Gas compressor
518:
516:Fluid dynamics
513:
508:
503:
498:
493:
488:
483:
477:
475:
469:
468:
463:
461:
460:
453:
446:
438:
432:
431:
423:
422:External links
420:
417:
416:
402:
391:
352:
351:
349:
346:
345:
344:
314:
297:
294:
291:
290:
273:
272:
270:
267:
266:
265:
259:
251:
248:
245:
244:
241:
238:
234:
233:
230:
227:
223:
222:
219:
216:
212:
211:
208:
205:
201:
200:
197:
194:
162:
161:Similar scales
159:
152:
151:
146:
143:
140:
136:
135:
132:
129:
126:
122:
121:
118:
115:
112:
108:
107:
104:
97:
94:
90:
89:
86:
83:
80:
66:
63:
26:
24:
14:
13:
10:
9:
6:
4:
3:
2:
1861:
1850:
1847:
1845:
1842:
1840:
1837:
1836:
1834:
1819:
1816:
1814:
1811:
1809:
1806:
1804:
1801:
1799:
1796:
1794:
1791:
1789:
1786:
1784:
1781:
1780:
1778:
1774:
1767:
1764:
1761:
1758:
1756:
1753:
1750:
1747:
1746:
1744:
1740:
1734:
1731:
1729:
1726:
1724:
1721:
1719:
1716:
1714:
1711:
1709:
1706:
1704:
1701:
1699:
1696:
1694:
1691:
1689:
1686:
1684:
1681:
1679:
1676:
1675:
1673:
1671:organizations
1667:
1661:
1658:
1656:
1653:
1651:
1648:
1646:
1643:
1641:
1638:
1636:
1633:
1631:
1628:
1626:
1623:
1621:
1618:
1616:
1615:Duct cleaning
1613:
1611:
1608:
1605:
1602:
1600:
1597:
1595:
1592:
1590:
1587:
1585:
1582:
1581:
1579:
1571:
1565:
1562:
1560:
1557:
1555:
1552:
1549:
1546:
1544:
1541:
1539:
1536:
1534:
1531:
1529:
1526:
1524:
1521:
1519:
1516:
1513:
1510:
1507:
1504:
1502:
1499:
1497:
1494:
1492:
1489:
1487:
1484:
1482:
1479:
1477:
1474:
1472:
1469:
1467:
1466:Control valve
1464:
1461:
1458:
1456:
1453:
1451:
1448:
1446:
1443:
1441:
1438:
1436:
1433:
1431:
1428:
1427:
1425:
1419:
1413:
1410:
1408:
1405:
1403:
1400:
1398:
1395:
1392:
1389:
1387:
1386:Turning vanes
1384:
1382:
1379:
1377:
1374:
1372:
1369:
1367:
1364:
1362:
1361:Thermal wheel
1359:
1357:
1354:
1352:
1349:
1347:
1344:
1342:
1339:
1337:
1334:
1332:
1329:
1327:
1326:Solar chimney
1324:
1322:
1319:
1317:
1314:
1312:
1309:
1307:
1304:
1302:
1299:
1297:
1294:
1292:
1289:
1287:
1284:
1282:
1279:
1277:
1274:
1272:
1269:
1267:
1264:
1262:
1259:
1257:
1254:
1252:
1249:
1247:
1244:
1242:
1239:
1237:
1234:
1232:
1229:
1227:
1224:
1222:
1219:
1217:
1214:
1212:
1209:
1207:
1204:
1202:
1199:
1197:
1194:
1192:
1189:
1187:
1184:
1182:
1179:
1177:
1174:
1172:
1169:
1167:
1164:
1162:
1159:
1157:
1154:
1152:
1149:
1147:
1144:
1142:
1139:
1137:
1134:
1132:
1129:
1127:
1124:
1122:
1119:
1117:
1114:
1112:
1109:
1107:
1104:
1102:
1099:
1097:
1096:Fan coil unit
1094:
1092:
1089:
1087:
1084:
1082:
1079:
1077:
1074:
1072:
1069:
1067:
1064:
1062:
1059:
1057:
1054:
1052:
1049:
1047:
1044:
1042:
1041:Cooling tower
1039:
1037:
1034:
1032:
1029:
1027:
1024:
1022:
1019:
1017:
1014:
1012:
1009:
1007:
1004:
1002:
999:
997:
994:
992:
989:
987:
984:
982:
979:
977:
974:
972:
969:
967:
964:
962:
959:
957:
954:
952:
949:
947:
944:
942:
939:
937:
934:
932:
929:
928:
926:
922:
916:
913:
911:
908:
905:
902:
899:
896:
893:
890:
888:
887:Vapor barrier
885:
883:
880:
878:
875:
873:
870:
868:
865:
863:
862:Solar heating
860:
858:
857:Solar cooling
855:
853:
850:
848:
845:
843:
840:
838:
835:
833:
832:Refrigeration
830:
828:
825:
823:
820:
818:
815:
813:
810:
808:
805:
803:
802:Passive house
800:
798:
795:
793:
790:
788:
785:
783:
780:
778:
775:
773:
770:
768:
765:
763:
760:
757:
754:
752:
749:
747:
744:
742:
739:
737:
734:
731:
728:
726:
723:
721:
718:
716:
713:
711:
708:
705:
702:
700:
697:
694:
691:
689:
686:
684:
681:
678:
675:
673:
672:Chilled water
670:
668:
665:
663:
660:
658:
655:
653:
650:
648:
645:
643:
640:
638:
635:
633:
630:
628:
625:
623:
620:
618:
615:
614:
612:
608:
602:
599:
597:
594:
592:
589:
587:
584:
582:
579:
577:
574:
572:
571:Sensible heat
569:
567:
564:
562:
559:
557:
554:
552:
551:Noise control
549:
547:
544:
542:
539:
537:
534:
532:
531:Heat transfer
529:
527:
524:
522:
519:
517:
514:
512:
509:
507:
504:
502:
499:
497:
494:
492:
489:
487:
484:
482:
479:
478:
476:
470:
466:
459:
454:
452:
447:
445:
440:
439:
436:
429:
426:
425:
421:
414:
409:
407:
403:
400:
395:
392:
377:
370:
364:
362:
360:
358:
354:
347:
335:on 2009-01-07
331:
327:
320:
315:
305:
300:
299:
295:
287:
283:
278:
275:
268:
263:
260:
257:
254:
253:
249:
242:
239:
236:
235:
231:
228:
225:
224:
220:
217:
214:
213:
209:
206:
203:
202:
198:
195:
192:
191:
188:
185:
183:
179:
174:
171:
166:
160:
158:
147:
144:
141:
138:
133:
130:
127:
124:
119:
116:
113:
110:
105:
102:
98:
96:> 10.0 μm
95:
92:
87:
84:
81:
78:
77:
74:
72:
64:
62:
60:
56:
55:pressure drop
52:
48:
44:
40:
36:
32:
19:
1793:Fireproofing
1577:and services
1573:Professions,
1505:
1471:Gas detector
1371:Trickle vent
1346:Smoke damper
1341:Smoke canopy
1336:Space heater
1266:Plenum space
1201:Heating film
1081:Exhaust hood
1051:Dehumidifier
991:Blast damper
986:Barrier pipe
961:Air purifier
872:Thermosiphon
751:Free cooling
667:Chilled beam
591:Thermal mass
576:Stack effect
561:Particulates
541:Infiltration
472:Fundamental
394:
383:. Retrieved
376:the original
337:. Retrieved
330:the original
325:
307:. Retrieved
277:
186:
175:
167:
164:
155:
148:Hospital and
68:
34:
30:
29:
1839:Air filters
1803:Warm Spaces
1445:Blower door
1423:and control
1421:Measurement
1402:Windcatcher
1376:Trombe wall
1316:Sail switch
1296:Refrigerant
1291:Recuperator
1166:Grease duct
1126:Freeze stat
1111:Fire damper
981:Back boiler
951:Air ionizer
946:Air handler
910:Ventilation
762:Hybrid heat
627:Air barrier
546:Latent heat
71:micrometers
43:air filters
1833:Categories
1559:Thermostat
1481:Humidistat
1412:Zone valve
1381:TurboSwing
1256:Oil heater
1226:Humidifier
1156:Gas heater
1106:Fan heater
1076:Evaporator
1061:Economizer
1036:Compressor
941:Air filter
924:Components
741:Forced-air
637:Antifreeze
610:Technology
556:Outgassing
496:Convection
430:at EPA.gov
385:2012-08-20
348:References
339:2009-05-11
309:2007-09-19
243:1500-1900
232:1000-1200
170:Home Depot
101:dust mites
65:MERV scale
1669:Industry
1518:OpenTherm
1196:Heat pump
1191:Heat pipe
1141:Fume hood
1116:Fireplace
1021:Condenser
971:Attic fan
767:Hydronics
59:allergens
1776:See also
1501:LonWorks
1435:Aquastat
1301:Register
1281:Radiator
936:Air door
736:Firestop
536:Humidity
511:Enthalpy
501:Dilution
486:Bake-out
474:concepts
250:See also
99:Pollen,
1575:trades,
1146:Furnace
1011:Chiller
683:Coolant
296:Sources
1728:SMACNA
1688:ASHRAE
1508:(MERV)
1462:(CADR)
1440:BACnet
1393:(ULPA)
1246:Louver
1171:Grille
1046:Damper
996:Boiler
894:(VCRS)
695:(DOAS)
286:ASHRAE
139:13–16
39:ASHRAE
1768:(VOC)
1762:(SBS)
1751:(IAQ)
1708:CIBSE
1703:BSRIA
1606:(BIM)
1550:(STP)
1514:(NTP)
1136:Freon
906:(VRF)
900:(VAV)
758:(HRV)
732:(ERV)
706:(DCV)
679:(CAV)
379:(PDF)
372:(PDF)
333:(PDF)
322:(PDF)
269:Notes
193:MERV
125:9–12
79:MERV
1723:LEED
1683:AMCA
1678:AHRI
1211:HEPA
1131:Flue
1056:Duct
282:ANSI
221:600
210:300
199:MPR
196:FPR
176:The
168:The
111:5–8
93:1–4
47:HEPA
35:MERV
18:MERV
1733:UMC
1718:IIR
1698:BRE
1091:Fan
240:10
237:13
226:11
1835::
405:^
356:^
324:.
229:7
218:5
215:8
204:6
178:3M
457:e
450:t
443:v
388:.
342:.
312:.
284:/
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.