• 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 4-68 centrifugal fan, also known as a centrifugal blower or centrifugal ventilator, is designed for indoor ventilation in general factories and large buildings. This industrial centrifugal fan is suitable for both air input and output, managing air temperatures up to 80°C and handling non-self-igniting, non-corrosive gases harmless to the human body. The air must be free from sticky substances, and the dust and hard particles contained should not exceed 150mg/m³.

Type

The 4-68 centrifugal ventilator offers flexibility with its right-hand (clockwise) or left-hand (counterclockwise) impeller rotation, indicated by "right" and "left" respectively. The outlet position is defined by the casing's outlet angle, with models ranging from No. 2.8 to No. 12.5 adjustable upon installation, and models No. 16 and No. 20 having fixed positions at 0°, 90°, and 180°. Transmission types include A, B, C, and D, with No. 2.8 to No. 5 using A, and No. 6.3 to No. 12.5 utilizing C and D, while No. 16 and No. 20 adopt B-type transmission.

Overall Structure

The 4-68 type centrifugal fan consists of several key components:
① Impeller. It consists of 12 backward-inclined wing-shaped blades welded between the curved wheel cover and the flat wheel disc. They are all made of steel plates and have been statically and dynamically tested. Balanced and corrected, good air performance, high efficiency and smooth operation.
② Casing. A volute body welded from ordinary steel plates. The casing is made into two different forms: No. 2.8 to No. 12.5 casings are made as a whole and cannot be disassembled; No. 16 and No. 20 casings are made into two-part type, divided into two halves along the center horizontal plane and connected with bolts.
③ Air Inlet. It is made into a convergent streamlined overall structure and installed on the side of the fan; the cross section parallel to the axial direction is a curved shape, which allows the gas to enter the impeller smoothly with less loss.
④ Transmission part. It is composed of main shaft, bearing box, rolling bearing, pulley or coupling.

Performance And Options

Only the dimensionless performance table and performance curve of the No. 10 prototype are given here. The dimensional performance parameters of fans above No. 10 can be calculated based on this performance table and curve.

Dimensionless performance table of 4-68No.10 prototype
No	1	2	3	4	5	6	7
φ	0.165	0.185	0.205	0.225	0.245	0.265	0.285
ψ	0.498	0.487	0.472	0.45	0.422	0.388	0.35
λ	0.094	0.1	0.104	0.109	0.112	0.116	0.118
ηi	0.876	0.903	0.922	0.93	0.92	0.885	0.847

 
Fan performance generally refers to the performance of delivering air under standard conditions. When the use state is non-standard, the performance of non-standard conditions must be
Convert to the performance under standard conditions, and then select the fan based on the converted performance.

4-68 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
8D	1450	17018	2180	85.8	12.0	14.1	Y180M-4	18.5
		19214	2136	88.7	12.9	15.1
		21410	2065	90.9	13.5	15.9
		23606	1968	91.5	14.1	16.5
		25802	1835	90.4	14.6	17.1
		27998	1667	88	14.7	17.3
		30194	1481	84.3	14.7	17.3
9D	1450	24231	2759	85.8	21.6	25.4	Y200L-4	30
		27358	2703	88.7	23.2	27.2
		30485	2614	90.9	24.3	28.6
		33611	2491	91.5	25.4	29.8
		36738	2323	90.4	26.2	30.8
		39864	2110	88	26.6	31.2
		42991	1875	84.3	26.6	31.2
	960	16043	1210	85.8	6.3	7.4	Y160L-6	11
		18113	1185	88.7	6.7	7.9
		20183	1146	90.9	7.1	8.3
		22253	1092	91.5	7.4	8.7
		24323	1018	90.4	7.6	8.9
		26393	925	88	7.7	9.0
		28463	822	84.3	7.7	9.0
10D	1450	33239	3407	85.8	36.7	43.0	Y250M-4	55
		37528	3337	88.7	39.2	46.0
		41817	3227	90.9	41.2	48.4
		46106	3075	91.5	43.0	50.5
		50395	2868	90.4	44.4	52.1
		54684	2605	88	45.0	52.8
		58973	2315	84.3	45.0	52.8
	960	22007	1493	85.8	10.6	12.5	Y180L-6	15
		24846	1463	88.7	11.4	13.4
		27686	1414	90.9	12.0	14.0
		30525	1348	91.5	12.5	14.7
		33365	1257	90.4	12.9	15.1
		36204	1142	88	13.0	15.3
		39044	1015	84.3	13.1	15.3
	730	16734	863	85.8	4.7	5.5	Y160L-8	7.5
		18893	846	88.7	5.0	5.9
		21053	818	90.9	5.3	6.2
		23212	779	91.5	5.5	6.4
		25371	727	90.4	5.7	6.6
		27530	660	88	5.7	6.7
		29690	587	84.3	5.7	6.7
11.2D	1450	46699	4273	85.8	64.6	75.8	Y280M-4	90
		52724	4187	88.7	69.1	81.1
		58750	4048	90.9	72.7	85.3
		64776	3857	91.5	75.9	89.0
		70801	3597	90.4	78.3	91.8
		76827	3268	88	79.2	93.0
		82852	2904	84.3	79.3	93.0
	960	30918	1873	85.8	18.7	22.0	Y225M-6	30
		34907	1835	88.7	20.1	23.5
		38896	1774	90.9	21.1	24.7
		42886	1691	91.5	22.0	25.8
		46875	1577	90.4	22.7	26.7
		50865	1432	88	23.0	27.0
		54854	1273	84.3	23.0	27.0
	730	23510	1083	85.8	8.2	9.7	Y180L-8	11
		26544	1061	88.7	8.8	10.4
		29578	1026	90.9	9.3	10.9
		32611	978	91.5	9.7	11.4
		35645	912	90.4	10.0	11.7
		38678	828	88	10.1	11.9
		41712	736	84.3	10.1	11.9
12.5D	1450	64920	5323	85.8	111.9	131.3	Y315M2-4	160
		73297	5215	88.7	119.7	140.5
		81674	5042	90.9	125.8	147.7
		90051	4805	91.5	131.3	154.1
		98428	4481	90.4	135.5	159.0
		106804	4070	88	137.2	161.0
		115181	3617	84.3	137.3	161.1
	960	42982	2333	85.8	32.5	38.1	Y280S-6	45
		48528	2286	88.7	34.7	40.8
		54074	2210	90.9	36.5	42.9
		59620	2106	91.5	38.1	44.7
		65166	1964	90.4	39.3	46.1
		70712	1784	88	39.8	46.7
		76258	1585	84.3	39.8	46.7
	730	32684	1349	85.8	14.3	16.8	Y225M-8	22
		36901	1322	88.7	15.3	17.9
		41119	1278	90.9	16.1	18.8
		45336	1218	91.5	16.8	19.7
		49553	1136	90.4	17.3	20.3
		53770	1032	88	17.5	20.5
		57988	917	84.3	17.5	20.6
14D	1450	91208	6677	85.8	197.2	231.4	Y355M2-4	250
		102977	6541	88.7	211.0	247.6
		114746	6325	90.9	221.8	260.2	Y355L2-4	315
		126515	6027	91.5	231.5	271.6
		138284	5621	90.4	238.8	280.3
		150052	5106	88	241.8	283.8
		161821	4537	84.3	241.9	283.9
	960	60386	2927	85.8	57.2	67.1	Y315S-6	75
		68178	2867	88.7	61.2	71.8
		75970	2772	90.9	64.4	75.5
		83761	2642	91.5	67.2	78.8	Y315M1-6	90
		91553	2464	90.4	69.3	81.3
		99345	2238	88	70.2	82.4
		107137	1989	84.3	70.2	82.4
	730	45919	1692	85.8	25.2	29.5	Y280S-8	37
		51844	1658	88.7	26.9	31.6
		57769	1603	90.9	28.3	33.2
		63694	1528	91.5	29.5	34.7
		69619	1425	90.4	30.5	35.8
		75544	1294	88	30.9	36.2
		81469	1150	84.3	30.9	36.2
16D	960	90139	3823	85.8	111.6	130.9	Y355M1-6	160
		101770	3745	88.7	119.4	140.1
		113401	3621	90.9	125.5	147.3
		125032	3450	91.5	131.0	153.7
		136663	3218	90.4	135.1	158.6
		148293	2923	88	136.8	160.6
		159924	2598	84.3	136.9	160.6
	730	68543	2210	85.8	49.1	57.6	Y315M1-8	75
		77388	2166	88.7	52.5	61.6
		86232	2094	90.9	55.2	64.7
		95076	1995	91.5	57.6	67.6
		103920	1861	90.4	59.4	69.7
		112765	1690	88	60.2	70.6
		121609	1502	84.3	60.2	70.6
	580	54459	1395	85.8	24.6	28.9	Y315S-10	45
		61486	1367	88.7	26.3	30.9
		68513	1322	90.9	27.7	32.5
		75540	1259	91.5	28.9	33.9
		82567	1175	90.4	29.8	35.0
		89594	1067	88	30.2	35.4
		96621	948	84.3	30.2	35.4

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