• Durability: Vinylester resin, UV protection, extended service life.
• Customizable: Computer strain analysis, G2.5 balance, low vibration risk.
• Easy Maintenance: Oil bath bearings, heat/corrosion resistant, cost-effective.
• Professional Team: Expert wind turbine guidance.
• High aerodynamic efficiency, low noise, corrosion resistance.
• Medium temp range: -20℃ to 80℃, ≤ humidity, ≤ 100mg/m3 dust content.
• Durable Fiberglass Build: Ensures long-lasting performance.
• Ethylene-based fiberglass blades optimize airflow.

Application

The 4-72 centrifugal fan is ideal for indoor ventilation in general factories and large buildings. It efficiently conveys air and non-self-igniting gases that are harmless and non-corrosive to copper. The B4-72 fan is designed for ventilating flammable volatile gases, ensuring that gas does not contain sticky substances, with dust and hard particles not exceeding 150mg/m3, and gas temperature not exceeding 80°C. The B4-72 fan shares performance, selected parts, and foundation dimensions with the 4-72 model. Both models are structurally similar. Sizes No. 2.8 to No. 6A use a B35 type motor with a flange and foot. Sizes No. 6 to No. 12C, D use the YB series motors, with B3 installation. The F4-72 fan, made of stainless steel, is used to convey corrosive gases, maintaining the same performance and foundation dimensions as the 4-72 model.

Angle

When viewed from the motor end, a right-handed fan with clockwise impeller rotation is indicated by "right", and a left-handed fan with counterclockwise rotation is indicated by "left". The fan's outlet position is determined by the casing's outlet angle. For 4-72 fans sized No. 2.8 to No. 6, the outlet position is adjustable from 0° to 225° in 45° intervals. For sizes No. 3.2 to No. 6, the outlet position adjusts from 0° to 225° in 22.5° intervals. Sizes No. 8 to No. 12 adjust from 0° to 225° in 45° intervals. Sizes No. 16 and No. 20 are fixed at 0°, 90°, and 180°, which need to be specified when ordering. There are four transmission types: A, B, C, and D. Sizes No. 2.8 to No. 6 use A transmission; No. 8 to No. 12 use C and D transmission; and No. 16 to No. 20 use B transmission.

Overall Structure

For 4-72 fans, sizes No. 2.8 to No. 6 are mainly composed of an impeller, casing, air inlet, and other parts with a direct-connected motor. Sizes No. 8 to No. 20 include transmission parts in addition to the above components.
Impeller: Features 10 backward-inclined wing-shaped blades, a curved front disc, and a flat rear disc. Made of copper plate or cast aluminum alloy, it is dynamically and statically balanced for excellent air performance, high efficiency, and stable operation.
Casing: Made in two forms. Sizes No. 2.8 to No. 12 are a single piece and cannot be disassembled. Sizes No. 16 to No. 20 are made in three parts, divided horizontally and vertically, connected by bolts.
Air Inlet: An integral part installed on the fan side, with a curved surface parallel to the axial direction, allowing smooth gas entry with minimal loss.
Transmission Part: Comprises a main shaft, bearing box, rolling bearing, pulley, or coupling.

Performance and selection

Here we only give the dimensionless performance table and performance curve of the No. 10 model. Based on this performance table and performance curve, we can calculate the dimensional performance parameters of fans above No. 10. Fan performance generally refers to the performance of conveying air under standard conditions.

Dimensionless performance of 4-72No.10 prototype
Serial number	1	2	3	4	5	6
φ	0.1884	0.2051	0.2218	0.2361	0.25	0.2637
ψ	0.458	0.452	0.434	0.413	0.39	0.363
ψd	0.0335	0.0397	0.0465	0.0528	0.0594	0.0663
λ	0.0995	0.1045	0.1082	0.1106	0.1126	0.1137
ηi	0.867	0.887	0.89	0.882	0.866	0.842

The 4-72 centrifugal fan is designed for indoor ventilation in factories and large buildings, efficiently conveying non-corrosive gases. The B4-72 model is suited for flammable volatile gases, while the F4-72 is made of stainless steel for corrosive gases. All models maintain the same performance and dimensions, offering flexibility and reliability. Available in right-hand or left-hand rotation, these fans ensure optimal air distribution.

4-72 Centrifugal Fan Performance Table Inlet pressure: P = 101325Pa Medium temperature: T = 20℃ Medium density: ρ = 1.2kg/m3
Machine number	Speed r/min	Flow rate m3/h	Total pressure Pa	efficiency%	Internal power Kw	Required power kW	Motor
							model	Power KW
2.8A	2900	1131	994	69.3	0.45	0.67	Y90S-2 (B35)	1.5
		1310	966	73.2	0.48	0.72
		1480	933	75.5	0.51	0.71
		1659	887	76.8	0.53	0.74
		1828	835	76.9	0.55	0.77
		2007	770	75.6	0.57	0.79
		2177	702	73.2	0.58	0.81
		2356	606	69.3	0.57	0.8
3.2A	2900	1688	1300	69.3	0.88	1.23	Y90L-2 (B35)	2.2
		1955	1263	73.2	0.93	1.81
		2209	1220	75.5	0.99	1.38
		2476	1160	76.8	1.03	1.34
		2729	1091	76.9	1.07	1.39
		2996	1006	75.6	1.1	1.43
		3250	918	73.2	1.13	1.47
		3517	792	69.3	1.11	1.45
3.2A	1450	844	324	69.3	0.11	0.16	Y90S-4 (B35)	1.1
		978	315	73.2	0.12	0.17
		1104	304	75.5	0.12	0.19
		1238	289	76.8	0.13	0.19
		1365	272	76.9	0.13	0.2
		1498	251	75.6	0.14	0.21
		1625	229	73.2	0.14	0.21
		1758	198	69.3	0.14	0.21
3.6A	2900	2664	1578	74.2	1.56	2.03	Y100L-2 (B35)	3
		3045	1531	77.8	1.65	2.15
		3405	1481	80.3	1.73	2.25
		3786	1419	82.1	1.81	2.35
		4146	1343	82.6	1.86	2.42
		4527	1256	81.8	1.92	2.5
		4887	1144	79.5	1.95	2.53
		5268	989	74.3	1.94	2.52
	1450	1332	393	74.2	0.2	0.29	Y90S-4 (B35)	1.1
		1522	381	77.8	0.21	0.31
		1703	369	80.3	0.22	0.33
		1893	353	82.1	0.23	0.34
		2073	335	82.6	0.23	0.35
		2263	313	81.8	0.24	0.36
		2444	285	79.5	0.24	0.36
		2634	247	74.3	0.24	0.36
4A	2900	4012	2014	77	2.89	3.47	Y132S1-2 (B35)	5.5
		4506	1969	80.3	3.05	3.66
		4973	1915	82.5	3.1	3.82
		5468	1830	84.1	3.28	3.94
		5962	1723	84.6	3.35	4.02
		6457	1606	83.7	3.42	4.11
		6924	1459	81.4	3.43	4.11
		7419	1320	77.5	3.49	4.19
	1450	2006	501	77	0.36	0.54	Y90S-4 (B35)	1.1
		2253	490	80.3	0.38	0.57
		2487	476	82.5	0.4	0.6
		2734	455	84.1	0.41	0.62
		2981	429	84.6	0.42	0.63
		3228	400	83.7	0.43	0.64
		3462	363	81.4	0.43	0.64
		3709	329	77.5	0.44	0.66
4.5A	2900	5712	2554	77	5.21	6	Y132S2-2 (B35)	7.5
		6416	2497	80.3	5.49	6.32
		7081	2428	82.5	5.74	6.6
		7785	2320	84.1	5.92	6.81
		8489	2184	84.6	6.04	6.95
		9194	2036	83.7	6.17	7.09
		9859	1849	81.4	6.17	7.1
		10562	1673	77.5	6.3	7.24
	1450	2856	634	77	0.65	0.91	Y90S-4 (B35)	1.1
		3208	620	80.3	0.69	0.96
		3540	603	82.5	0.72	1
		3893	577	84.1	0.74	1.04
		4245	543	84.6	0.76	1.06
		4597	506	83.7	0.77	1.08
		4929	460	81.4	0.77	1.08
		5281	416	77.5	0.79	1.1
5A	2900	7728	3187	77.6	8.72	10.02	Y160M2-2 (B35)	15
		8855	3145	81.8	9.35	10.76
		9928	3074	84.7	9.9	11.39
		11054	2962	86	10.47	12.04
		12128	2792	86.1	10.82	12.44
		13255	2567	84.6	11.07	12.72
		14328	2335	82.1	11.22	12.9
		15455	2019	77.6	11.09	12.75
	1450	3864	790	77.6	1.09	1.42	Y100L1-4 (B35)	2.2
		4427	780	81.8	1.17	1.52
		4964	762	84.7	1.24	1.61
		5527	735	86	1.31	1.7
		6064	693	86.1	1.35	1.76
		6628	637	84.6	1.38	1.8
		7164	580	82.1	1.4	1.82
		7728	502	77.6	1.39	1.8
6A	1450	6677	1139	77.6	2.71	3.25	Y112M-4 (B35)	4
		7650	1124	81.8	2.91	3.49
		8578	1099	84.7	3.08	3.7
		9551	1059	86	3.26	3.91
		10478	999	86.1	3.36	4.04
		11452	919	84.6	3.44	4.13
		12379	836	82.1	3.49	4.19
		13353	724	77.6	3.45	4.14
	960	4420	498	77.6	0.79	1.1	Y100L-6 (B35)	1.5
		5065	492	81.8	0.84	1.18
		5679	481	84.7	0.89	1.25
		6324	463	86	0.94	1.32
		6938	437	86.1	0.98	1.37
		7582	402	84.6	1	1.4
		8196	366	82.1	1.01	1.32
		8841	317	77.6	1	1.3
6D	1450	6677	1139	77.6	2.71	3.32	Y112M-4	4
		7650	1124	81.8	2.91	3.56
		8578	1099	84.7	3.08	3.77
		9551	1059	86	3.26	3.99
		10478	999	86.1	3.36	4.12
		11452	919	84.6	3.44	4.21
		12379	836	82.1	3.49	4.27
		13353	724	77.6	3.45	4.22
	960	4420	498	77.6	0.79	1.12	Y100L-6	1.5
		5065	492	81.8	0.84	1.21
		5679	481	84.7	0.89	1.28
		6324	463	86	0.94	1.35
		6938	437	86.1	0.98	1.39
		7582	402	84.6	1	1.32
		8196	366	82.1	1.01	1.34
		8841	317	77.6	1	1.33
8D	1450	15826	2032	77.6	11.42	13.41	Y180M-4	18.5
		18134	2005	81.8	12.26	14.39
		20332	1960	84.7	12.98	15.23
		22640	1888	86	13.72	16.1
		24838	1781	86.1	14.18	16.64
		27146	1638	84.6	14.5	17.02
		29344	1490	82.1	14.71	17.26
	960	10478	887	77.6	3.32	4.06	Y132M2-6	5.5
		12006	875	81.8	3.56	4.36
		13461	856	84.7	3.77	4.61
		14989	825	86	3.98	4.88
		16444	778	86.1	4.11	5.04
		17972	715	84.6	4.21	5.15
		19428	651	82.1	4.27	5.23
	730	7968	512	77.6	1.46	1.93	Y132M-8	3
		9130	506	81.8	1.56	2.08
		10236	494	84.7	1.66	2.2
		11398	476	86	1.75	2.32
		12504	449	86.1	1.81	2.4
		13666	413	84.6	1.85	2.45
		14773	376	82.1	1.88	2.49
10D	1450	40441	3202	86.7	41	48.12	Y250M-4	55
		44026	3159	88.7	43.07	50.53
		47611	3032	89	44.59	52.33
		50680	2884	88.2	45.58	53.49
		53664	2722	86.6	46.4	54.45
		56605	2532	84.2	46.86	54.98
	960	26775	1395	86.7	11.9	13.96	Y200L1-6	18.5
		29148	1376	88.7	12.5	14.67
		31521	1321	89	12.94	15.18
		33554	1257	88.2	13.23	15.52
		35529	1187	86.6	13.47	15.8
		37476	1104	84.2	13.6	15.96
	730	20360	805	86.7	5.23	6.14	Y160L-8	7.5
		22164	794	88.7	5.5	6.45
		23969	762	89	5.69	6.68
		25515	725	88.2	5.82	6.82
		27017	685	86.6	5.92	6.95
		28497	637	84.2	5.98	7.02
12D	960	46267	2013	86.7	29.61	34.75	Y280S-6	45
		50368	1986	88.7	31.1	36.49
		54469	1906	89	32.2	37.7
		57981	1814	88.2	32.91	38.62
		61395	1712	86.6	33.51	39.32
		64759	1593	84.2	33.84	39.71
	730	35182	1160	86.7	13.02	15.28	Y225S-8	18.5
		38301	1145	88.7	13.67	16.05
		41419	1099	89	14.16	16.61
		44090	1046	88.2	14.47	16.98
		46685	987	86.6	14.73	17.29
		49244	919	84.2	14.88	17.46
16B\C	900	102810	3157	86.7	102.81	124.45	JS125-6	130
		111930	3115	88.7	107.98	130.7	(Y315M3-6)	132
		121040	2990	89	111.8	135.33	JS126-6	155
		128840	2844	88.2	114.28	138.33
		136430	2684	86.6	116.35	140.84
		143910	2497	84.2	117.48	142.2
	800	91392	2489	86.7	72.21	87.41	JS117-6	115
		99493	2456	88.7	75.84	91.81
		107590	2357	89	78.53	95.06
		114530	2242	88.2	80.27	97.16
		121270	2117	86.6	81.72	98.92
		127920	1969	84.2	82.52	99.89
	710	81110	1957	86.7	50.48	61.1	Y315S-6	75
		88300	1931	88.7	53.02	64.18
		95490	1853	89	54.89	66.45
		101640	1763	88.2	56.11	67.92
		107630	1664	86.6	57.12	69.15
		113520	1549	84.2	57.08	69.83
	630	71971	1538	86.7	35.27	42.69	Y280M-6	55
		78351	1518	88.7	37.04	44.84
		84730	1457	89	38.35	46.42
		90193	1386	88.2	39.2	47.45
		95503	1309	86.6	39.91	48.31
		100730	1218	84.2	40.3	48.78
	560	63974	1214	86.7	24.77	29.98	Y250M-6	37
		69645	1198	88.7	26.01	31.49
		75316	1150	89	26.93	32.6
		80172	1094	88.2	27.53	33.33
		84892	1033	86.6	28.03	33.93
		89544	961	84.2	28.3	34.26
	500	57120	967	86.7	17.63	21.34	Y225M-6	30
		62183	654	88.7	18.52	22.41
		67246	916	89	19.17	23.21
		71582	872	88.2	19.6	23.72
		75796	823	86.6	19.95	24.15
		79950	766	84.2	20.15	24.39
	450	51408	783	86.7	12.85	15.56	Y200L1-6	18.5
		55965	773	88.7	13.5	16.34
		60521	742	89	13.98	16.92
		64423	706	88.2	14.29	17.29
		68216	666	86.6	14.54	17.61
		71955	620	84.2	14.69	17.78
	400	45696	618	86.7	9.03	10.93	Y180L-6	15
		49746	610	88.7	9.48	11.48
		53797	586	89	9.82	11.88
		57265	557	88.2	10.03	12.15
		60637	526	86.6	10.21	12.36
		63960	490	84.2	10.31	12.48
	355	40555	587	86.7	6.31	7.64	Y160L-6	11
		44150	480	88.7	6.63	8.02
		47745	461	89	6.86	8.31
		50823	439	88.2	7.01	8.49
		53815	414	86.6	7.14	8.64
		56764	386	84.2	7.21	8.73
	315	35985	383	86.7	4.41	5.57	Y160M-6	7.5
		39175	378	88.7	4.63	5.85
		42365	363	89	4.79	5.8
		45096	345	88.2	4.9	5.93
		47751	326	86.6	4.99	6.04
		50368	303	84.2	5.04	6.1
20B/C	710	158410	3069	86.7	154.04	186.46	JS137-8	210
		172460	3029	88.7	161.79	195.84
		186500	2907	89	167.51	202.76
		198520	2765	88.2	171.23	207.27
		210210	2609	86.6	174.33	211.02
		221730	2427	84.2	176.03	213.08
	630	140560	2411	86.7	107.62	130.27	JS128-8	155
		153020	2379	88.7	113.03	136.81
		165480	2284	89	117.03	141.65
		176150	2172	88.2	119.62	144.79
		186530	2050	86.6	121.79	147.43
		196750	1908	84.2	122.98	148.86
	560	124950	1902	86.7	75.59	91.5	JS126-8	110
		136020	1877	88.7	79.39	96.1
		147100	1801	89	82.2	99.5
		156580	1714	88.2	84.02	101.7
		165800	1618	86.6	85.54	103.54
		174890	1505	84.2	86.37	104.55
	500	111560	1514	86.7	53.8	65.13	Y315M1-8	75
		121450	1494	88.7	56.51	68.4
		131340	1434	89	58.51	70.82
		139800	1364	88.2	59.8	72.39
		148040	1288	86.6	60.89	73.7
		156150	1199	84.2	61.48	74.42
	450	100400	1225	86.7	39.22	47.48	Y315S-8	55
		109300	1209	88.7	41.19	49.86
		118200	1161	89	42.65	51.63
		125820	1104	88.2	43.6	52.77
		133230	1042	86.6	44.39	53.73
		140530	970	84.2	44.82	54.25
	400	89250	967	86.7	27.55	33.34	Y280M-8	45
		97161	654	88.7	28.93	35.02
		105070	916	89	29.96	36.26
		111840	872	88.2	30.62	37.06
		118430	823	86.6	31.17	37.73
		124920	766	84.2	31.48	38.1
	355	79209	761	86.7	19.26	23.31	Y250M-8	30
		86230	751	88.7	20.22	24.48
		93252	721	89	20.94	25.35
		99264	686	88.2	21.4	25.91
		105100	648	86.6	21.79	26.38
		110860	603	84.2	22	26.64
	315	70284	599	86.7	13.45	16.28	Y225M-8	22
		76514	591	88.7	14.13	17.1
		82744	568	89	14.63	17.71
		88079	540	88.2	14.95	18.1
		93265	510	86.6	15.22	18.43
		98376	475	84.2	15.37	18.61
	280	62475	473	86.7	9.45	11.44	Y200L-8	15
		68013	467	88.7	9.92	12.01
		73551	448	89	10.27	12.44
		78293	426	88.2	10.5	12.71
		82902	403	86.6	10.69	12.94
		87445	375	84.2	10.8	13.07
	250	55781	377	86.7	6.73	8.14	Y180L-8	11
		60726	372	88.7	7.06	8.55
		65670	357	89	7.31	8.85
		69904	340	88.2	7.48	9.05
		74020	321	86.6	7.61	9.21
		78076	299	84.2	7.68	9.3

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