LWFDF4-72 Centrifugal Fan

Name: LWFDF4-72 Centrifugal Fan
Brand: LONGWELL
SKU: LWFDF4-72
Availability: InStock

Category: Industrial Centrifugal Fans

CategoryIndustrial Centrifugal Fans

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Description

Description

LWFDF4-72 Centrifugal Fan | LONGWELL Industrial Fans

LWFDF4-72 Series

Centrifugal Fan

Reliable centrifugal airflow for industrial and commercial ventilation. A thickened carbon steel casing, a balanced backward-curved impeller and a matched motor keep air moving steadily, shift after shift.

🌀

Stable Airflow

📈

High Airflow Capacity

〰️

Low Vibration

⚙️

Multiple Configurations

LONGWELL LWFDF4-72 centrifugal fan in Type A direct drive and Type C belt drive versions with blue carbon steel casing

500 - 2,900 r/minSpeed Range

412 - 75,552 m³/hAir Volume Range

198 - 3,209 PaTotal Pressure Range

0.25 - 75 kWMatching Motor Power

Key Features at a Glance

One fan platform covering general ventilation, flammable gas and corrosive gas duty, in both direct drive and belt drive versions.

Stable Airflow

High Airflow Capacity

Low Vibration

High Efficiency

Reliable Operation

Multiple Configurations

Explosion-Proof Option

Anti-Corrosion Option

Wide Application Range

Product Specifications

Performance data and installation dimensions for the LWFDF4-72 series. Type A is direct drive (models 2A to 7.1A); Type C is belt drive (models 2.5A to 12A).

LWFDF4-72 Type A Technical Specifications

Direct drive models. Matching motor is shown as power (kW) and pole count; speed depends on the pole count.

Model	Speed (r/min)	Matching Motor (kW·p)	Flow Rate (m³/h)	Total Pressure (Pa)
LWFDF4-72-2A-0.55-2P-1-001	2900	0.55-2	412-859	507-310
LWFDF4-72-2.5A-0.75-2P-1-001	2900	0.75-2	805-1677	792-483
LWFDF4-72-2.8A-1.5-2P-1-001	2900	1.5-2	1131-2356	994-606
LWFDF4-72-3.2A-2.2-2P-1-001	2900	2.2-2	1688-3517	1300-792
LWFDF4-72-3.2A-1.1-4P-1-002	1450	1.1-4	884-1758	324-198
LWFDF4-72-3.6A-3-2P-1-001	2900	3.0-2	2664-5268	1578-989
LWFDF4-72-3.6A-1.1-4P-1-002	1450	1.1-4	1332-2634	393-247
LWFDF4-72-4A-5.5-2P-1-001	2900	5.5-2	4012-7419	2014-1320
LWFDF4-72-4A-1.1-4P-1-002	1450	1.1-4	2006-3709	501-329
LWFDF4-72-4.5A-7.5-2P-1-001	2900	7.5-2	5712-10562	2554-1673
LWFDF4-72-4.5A-1.1-4P-1-002	1450	1.1-4	2856-5281	634-416
LWFDF4-72-5A-15-2P-1-001	2900	15-2	7728-15445	3187-2019
LWFDF4-72-5A-2.2-4P-1-002	1450	2.2-4	3864-7728	790-502
LWFDF4-72-5.6A-3-4P-1-001	1450	3-4	7062-9885	975-759
LWFDF4-72-6A-4-4P-1-001	1450	4.0-4	6677-13353	1139-724
LWFDF4-72-6A-1.5-6P-1-002	960	1.5-6	4420-8841	498-317
LWFDF4-72-6.3A-7.5-4P-1-001	1450	7.5-4	7729-15458	1256-798
LWFDF4-72-7.1A-11-4P-1-001	1450	11-4	12676-20513	1573-1168
LWFDF4-72-7.1A-3-6P-1-002	960	3-6	8392-13581	689-512

LWFDF4-72 Type C Technical Specifications

Belt drive models. The same fan size can be run at different speeds by changing the pulley ratio, which is why several rows share one casing size.

Model	Speed (r/min)	Matching Motor (kW·p)	Flow Rate (m³/h)	Total Pressure (Pa)
LWFDF4-72-2.5A-0.75-2P-1-002	2200	0.75-2	805-1677	792-483
LWFDF4-72-2.8A-1.1-2P-1-002	2900	1.1-2	1131-2356	994-606
LWFDF4-72-2.8A-0.37-2P-1-003	2200	0.37-2	994-1522	556-443
LWFDF4-72-2.8A-0.25-2P-1-004	1800	0.25-2	813-1245	372-296
LWFDF4-72-3.2A-1.5-2P-1-003	2900	1.5-2	1688-3517	1300-792
LWFDF4-72-3.2A-0.75-2P-1-004	2200	0.75-2	1483-2273	726-579
LWFDF4-72-3.2A-0.55-2P-1-005	1800	0.55-2	1213-1860	488-387
LWFDF4-72-3.6A-3-2P-1-003	2900	3-2	2664-5268	1578-989
LWFDF4-72-3.6A-1.5-2P-1-004	2200	1.5-2	2310-3434	881-723
LWFDF4-72-3.6A-0.75-2P-1-005	1800	0.75-2	1890-2810	590-483
LWFDF4-72-4A-5.5-2P-1-003	2900	5.5-2	4012-7419	2017-1320
LWFDF4-72-4A-2.2-2P-1-004	2300	2.2-2	3573-5491	1238-917
LWFDF4-72-4A-1.5-2P-1-005	2000	1.5-2	3107-4775	936-694
LWFDF4-72-4A-1.1-2P-1-006	1700	1.1-2	2641-4058	676-501
LWFDF4-72-4.5A-7.5-2P-1-003	2900	7.5-2	5712-10562	2554-1673
LWFDF4-72-4.5A-4-2P-1-004	2300	4-2	5088-7619	1570-1163
LWFDF4-72-4.5A-3-2P-1-005	2000	3-2	4428-6799	1187-879
LWFDF4-72-4.5A-2.2-2P-1-006	1700	2.2-2	3761-5779	858-635
LWFDF4-72-5A-15-2P-1-003	2900	15-2	7782-15445	3187-2019
LWFDF4-72-5A-7.5-2P-1-004	2300	7.5-2	7022-11363	1978-1468
LWFDF4-72-5A-5.5-2P-1-005	2000	5.5-2	6106-9881	1495-1110
LWFDF4-72-5A-3-2P-1-006	1700	3-2	5190-8299	1080-802
LWFDF4-72-5.6A-18.5-2P-1-002	2600	18.5-2	12734-17824	3209-2541
LWFDF4-72-5.6A-15-2P-1-003	2300	15-2	11265-15768	2511-1989
LWFDF4-72-5.6A-7.5-2P-1-004	2000	7.5-2	9795-13711	1900-1504
LWFDF4-72-5.6A-5.5-4P-1-005	1700	5.5-4	8326-11654	1372-1086
LWFDF4-72-5.6A-3-4P-1-006	1400	3.0-4	6857-9598	930-737
LWFDF4-72-6A-15-4P-1-003	2240	15-4	10314-20628	2734-1733
LWFDF4-72-6A-11-4P-1-004	2000	11-4	9209-18418	2176-1380
LWFDF4-72-6A-7.5-4P-1-005	1800	7.5-4	8288-16576	1760-1116
LWFDF4-72-6A-5.5-4P-1-006	1600	5.5-4	7367-14734	1389-881
LWFDF4-72-6A-4-4P-1-007	1450	4-4	6677-13353	1137-724
LWFDF4-72-6A-2.2-4P-1-008	1120	2.2-4	5157-10314	679-431
LWFDF4-72-6A-1.5-4P-1-009	900	1.5-4	4144-8288	438-278
LWFDF4-72-6A-1.1-4P-1-010	800	1.1-4	3684-7367	346-220
LWFDF4-72-6.3A-18.5-2P-1-002	2200	18.5-2	15342-21474	2908-2303
LWFDF4-72-6.3A-11-2P-1-003	1900	11-2	13260-18546	2169-1718
LWFDF4-72-6.3A-7.5-2P-1-004	1600	7.5-2	11158-15618	1538-1218
LWFDF4-72-6.3A-5.5-2P-1-005	1300	5.5-2	9066-12689	1015-804
LWFDF4-72-6.3A-2.2-4P-1-006	1000	2.2-4	6973-9761	600-475
LWFDF4-72-6.3A-0.75-4P-1-007	700	0.75-4	4881-6833	294-233
LWFDF4-72-7.1A-18.5-4P-1-003	1800	18.5-4	15736-25265	2422-1801
LWFDF4-72-7.1A-15-4P-1-004	1600	15-4	13987-22635	1914-1423
LWFDF4-72-7.1A-11-4P-1-005	1450	11-4	12676-20513	1573-1168
LWFDF4-72-7.1A-5.5-4P-1-006	1200	5.5-4	10490-16976	1076-800
LWFDF4-72-7.1A-3-4P-1-007	960	3-4	8392-13581	689-512
LWFDF4-72-7.1A-1.5-4P-1-008	700	1.5-4	6119-9903	366-272
LWFDF4-72-8A-30-2P-1-001	1800	30-2	19641-25240	3143-3032
LWFDF4-72-8A-37-2P-1-002	1800	37-2	28195-36427	2920-2302
LWFDF4-72-8A-22-2P-1-003	1600	22-2	17463-22435	2478-2390
LWFDF4-72-8A-30-2P-1-004	1600	30-2	24982-32280	2303-1816
LWFDF4-72-8A-11-4P-1-005	1250	11-4	13643-25297	1507-1106
LWFDF4-72-8A-7.5-4P-1-006	1250	7.5-4	12224-15705	1209-1166
LWFDF4-72-8A-11-4P-1-007	1120	11-4	17487-22666	1124-887
LWFDF4-72-8A-5.5-4P-1-008	1120	5.5-4	10914-14022	963-929
LWFDF4-72-8A-7.5-4P-1-009	1000	7.5-4	15614-20237	895-707
LWFDF4-72-8A-4-4P-1-010	900	4-4	9823-12620	779-752
LWFDF4-72-8A-5.5-4P-1-011	900	5.5-4	14052-18213	752-572
LWFDF4-72-8A-3-4P-1-012	800	3-4	8732-16190	615-452
LWFDF4-72-8A-3-4P-1-013	710	3-4	7749-14368	485-356
LWFDF4-72-10A-37-4P-1-001	1250	37-4	34863-48797	2373-1877
LWFDF4-72-10A-30-4P-1-002	1120	30-4	31237-43722	1902-1505
LWFDF4-72-10A-18.5-4P-1-003	1000	18.5-4	27890-39038	1514-1199
LWFDF4-72-10A-15-4P-1-004	900	15-4	25101-35134	1225-970
LWFDF4-72-10A-11-4P-1-005	800	11-4	22312-31230	967-766
LWFDF4-72-10A-7.5-4P-1-006	710	7.5-4	19802-27717	761-603
LWFDF4-72-10A-5.5-4P-1-007	630	5.5-4	17571-24594	599-475
LWFDF4-72-10A-4-4P-1-008	560	4-4	15618-21861	473-375
LWFDF4-72-12A-75-4P-1-001	1120	75-4	53978-75552	2746-2172
LWFDF4-72-12A-45-4P-1-002	1000	45-4	48195-60397	2185-1968
LWFDF4-72-12A-55-4P-1-003	1000	55-4	63953-67457	1859-1729
LWFDF4-72-12A-37-4P-1-004	900	37-4	43375-60712	1767-1399
LWFDF4-72-12A-22-4P-1-005	800	22-4	38556-41973	1395-1376
LWFDF4-72-12A-30-4P-1-006	800	30-4	45391-53996	1321-1104
LWFDF4-72-12A-18.5-4P-1-007	710	18.5-4	34218-47895	1097-869
LWFDF4-72-12A-15-4P-1-008	630	15-4	30362-42498	863-684
LWFDF4-72-12A-7.5-4P-1-009	560	7.5-4	26989-29381	682-673
LWFDF4-72-12A-11-4P-1-010	560	11-4	31774-37776	646-540
LWFDF4-72-12A-7.5-4P-1-011	500	7.5-4	24907-33728	543-430

LWFDF4-72 Type A Mounting Dimensions

Direct drive layout. All dimensions in mm; weight is given without the motor.

LWFDF4-72 Type A direct drive mounting dimensions drawing with inlet, outlet and base dimension labels

Model	Motor Power	Φ1	Φ2	Φ3	A1	A2	A3	a×x	B1	B2	B3	b×y	n1-d1	C1	C2	C3	C4	C5	E	E1	H	H1	H2	H3	L	L1	n2-d2	Weight (kg)
LWFDF4-72-2A	0.55-2	200	220	238	146	178	206	2×89	150	182	210	2×91	8-Φ8	205	235	240	30	300	319	144	258	400	126	142	420	77	4-Φ10	22
LWFDF4-72-2.5A	0.75-2	250	280	296	168	200	228	2×100	196	228	258	2×114	8-Φ8	180	210	260	30	320	415	176	318	520	178	202	420	88	4-Φ10	33
LWFDF4-72-2.8A	1.5-2	280	306	324	190	226	254	4×56.5	206	244	272	4×61	16-Φ8	280	310	380	30	440	459	191	370	596	196	226	500	103	4-Φ10	40
LWFDF4-72-3.2A	2.2-2	320	350	367	224	254	284	4×63.5	251	282	310	4×70.5	16-Φ8	280	310	410	30	470	528	222	420	680	224	258	543	116	4-Φ10	52
LWFDF4-72-3.2A	1.1-4	320	350	367	224	254	284	4×63.5	251	282	310	4×70.5	16-Φ8	280	310	410	30	470	528	222	420	680	224	258	531	116	4-Φ10	50
LWFDF4-72-3.6A	3-2	360	394	416	252	284	312	4×71	281	313	343	4×78.3	16-Φ8	290	330	425	40	505	592	248	460	750	252	290	611	130	4-Φ10	67
LWFDF4-72-3.6A	1.1-4	360	394	416	252	284	312	4×71	281	313	343	4×78.3	16-Φ8	290	330	425	40	505	592	248	450	740	252	290	546	130	4-Φ10	58
LWFDF4-72-4A	5.5-2	400	440	462	278	310	338	4×77.5	317	349	377	4×87.3	16-Φ8	366	416	510	50	610	656	274	520	842	280	322	710	145	4-Φ12	92
LWFDF4-72-4A	1.1-4	400	440	462	278	310	338	4×77.5	317	349	377	4×87.3	16-Φ8	235	275	450	40	530	656	274	520	842	280	322	575	145	4-Φ10	68
LWFDF4-72-4.5A	7.5-2	450	490	512	315	345	373	3×115	348	380	408	5×76	16-Φ8	366	416	545	50	645	725	297	560	920	315	495	745	160	4-Φ12	128
LWFDF4-72-4.5A	1.1-4	450	490	512	315	345	373	3×115	348	380	408	5×76	16-Φ8	245	295	460	50	560	725	297	560	920	315	495	610	160	4-Φ12	79
LWFDF4-72-5A	15-2	500	550	572	350	380	408	5×76	390	422	450	5×84.4	20-Φ8	400	450	710	50	810	800	325	620	1020	350	400	878	180	4-Φ14	223
LWFDF4-72-5A	2.2-4	500	550	572	350	380	408	5×76	390	422	450	5×84.4	20-Φ8	265	315	520	50	810	800	325	620	1020	350	400	705	180	4-Φ14	106
LWFDF4-72-5.6A	3-4	560	610	640	388	420	448	4×105	440	472	500	4×118	16-Φ8	265	315	570	50	670	917	382	700	1151	392	451	745	200	4-Φ14	135
LWFDF4-72-6A	4-4	600	645	676	419	451	479	5×90.2	474	506	534	5×101.2	20-Φ8	295	345	595	50	695	964	392	740	1222	420	482	795	215	4-Φ14	155
LWFDF4-72-6A	1.5-6	600	645	676	419	451	479	5×90.2	474	506	534	5×101.2	20-Φ8	295	345	595	50	695	964	392	728	1210	420	482	775	215	4-Φ14	140
LWFDF4-72-6.3A	7.5-4	630	680	710	441	473	501	5×94.6	502	534	562	5×106.8	20-Φ8	376	436	645	60	765	1080	480	800	1306	441	506	870	230	4-Φ14	221
LWFDF4-72-7.1A	11-4	710	755	800	497	544	584	5×108.8	568	614	654	5×122.8	20-Φ10	410	470	820	60	945	1156	475	880	1455	494	575	1065	255	4-Φ14	360
LWFDF4-72-7.1A	3-6	710	755	800	497	544	584	5×108.8	568	614	654	5×122.8	20-Φ10	376	436	705	60	825	1156	475	880	1455	494	575	945	255	4-Φ14	263

LWFDF4-72 Type C Mounting Dimensions

Belt drive layout with the motor mounted on its own base. All dimensions in mm; weight is given without the motor.

LWFDF4-72 Type C belt drive mounting dimensions drawing with outlet flange and base dimension labels

Model	Φ1	Φ2	Φ3	A1	A2	A3	a×x	B1	B2	B3	b×y	n1-d1	C1	C2	C3	C4	C5	E	E1	E2	H	H1	L	L1	n2-d2	Weight (kg)
LWFDF4-72-2.5A	250	280	296	168	200	228	2×100	196	228	258	2×114	8-Φ8	354	390	320	50	740	510	308	178	350	526	650	88	6-Φ14	50
LWFDF4-72-2.8A	280	306	324	190	226	254	4×56.5	206	244	272	4×61	16-Φ8	354	390	320	50	740	566	340	196	380	571	680	103	6-Φ14	65
LWFDF4-72-3.2A	320	350	367	224	254	284	4×63.5	251	282	310	4×70.5	16-Φ8	354	390	320	50	740	642	384	224	420	644	700	116	6-Φ14	71
LWFDF4-72-3.6A	360	394	416	252	284	312	4×71	281	313	343	4×78.3	16-Φ8	334	370	370	50	840	718	428	252	470	720	730	130	6-Φ14	86
LWFDF4-72-4A	400	440	462	278	310	338	4×77.5	317	349	377	4×87.3	16-Φ8	394	430	415	50	930	785	462	280	500	766	820	145	6-Φ14	110
LWFDF4-72-4.5A	450	490	512	315	345	373	3×115	348	380	408	5×76	16-Φ8	394	430	415	50	930	885	523	315	550	850	870	160	6-Φ14	122
LWFDF4-72-5A	500	550	572	350	380	408	5×76	390	422	450	5×84.4	16-Φ8	614	650	475	50	1050	981	578	350	640	972	900	180	7-Φ14	160
LWFDF4-72-5.6A	560	610	640	388	420	448	4×105	440	472	500	4×118	16-Φ8	594	630	475	50	1050	1095	644	392	700	1082	930	200	7-Φ14	173
LWFDF4-72-6A	600	645	676	419	451	479	5×90.2	474	506	534	5×101.2	20-Φ8	647	725	535	50	1170	1174	692	420	750	1232	1100	215	7-Φ14	220
LWFDF4-72-6.3A	630	680	710	441	473	501	5×94.6	502	534	562	5×106.8	20-Φ8	764	800	555	50	1215	1231	725	441	800	1280	1100	230	7-Φ14	278
LWFDF4-72-7.1A	710	755	800	497	544	584	5×108.8	568	614	654	5×122.8	20-Φ10	764	800	555	50	1215	1397	821	494	760	1235	1200	255	7-Φ14	303

Powerful Airflow for Efficient Ventilation

The LWFDF4-72 centrifugal fan delivers stable and powerful airflow for ventilation, air exchange and exhaust applications, helping improve overall air circulation efficiency.

Air volume runs from 412 m³/h on the small direct-drive 2A up to 75,552 m³/h on the belt-drive 12A, with total pressure from 198 Pa to 3,209 Pa. One series therefore covers a single workshop bay and a full plant hall without changing product lines. The impeller throws air outward into the volute, and the rectangular outlet releases it as a focused stream, so the flow still has something left after a long duct run.

Wide working range — 412 to 75,552 m³/h and 198 to 3,209 Pa across the series
Concentrated discharge — the directed outlet suits ducted exhaust and air supply
Faster air exchange — heat and fumes leave the space instead of settling near the floor

LWFDF4-72 centrifugal fan delivering powerful airflow through a red inlet ring for efficient ventilation

Backward-Curved Impeller for Stable Airflow

The backward-curved impeller is designed for smooth and stable airflow delivery. Dynamically and statically balanced, it helps maintain reliable operation with good aerodynamic performance.

Because the blades lean away from the direction of rotation, air leaves the wheel gradually rather than being thrown off the tips. That keeps the pressure curve flatter and the airflow steadier as the resistance of the duct system rises. Each impeller is balanced before it is fitted to the shaft, so the wheel turns without the shake that slowly loosens fasteners and wears bearings.

Backward-curved blades — smooth, stable airflow delivery
Static and dynamic balancing — less vibration at any speed from 500 to 2,900 r/min
Good aerodynamic performance — output holds steady as system resistance changes

Backward-curved impeller of LWFDF4-72 centrifugal fan, dynamically and statically balanced

Thickened Carbon Steel Casing

Fine craftsmanship and a spray-painted finish provide a durable surface with good wear resistance and a reinforced structure for reliable long-term operation.

The volute is rolled from thickened carbon steel and coated after welding, so it keeps its profile under continuous static pressure instead of flexing and drumming. That matters in workshops where dust, moisture and fumes are present every day. The mounting base is welded as one piece with the casing, which keeps the unit sitting flat and stops it from walking across the floor once the fan is running.

Thickened steel material — holds its shape under sustained static pressure
Spray-painted finish — good wear resistance and surface corrosion protection
Reinforced structure — one-piece base and stiffened casing for long service life

Thickened carbon steel casing of LWFDF4-72 centrifugal fan with spray-painted blue finish and orange belt guard

Reliable Motor for Continuous Operation

The motor is selected to match the fan's operating requirements, providing reliable power for continuous ventilation and air-conveying applications.

Every frame is paired with a motor rated for its own duty point, from 0.25 kW on the smallest belt-drive unit up to 18.5 kW on the Type A 7.1A and 75 kW on the belt-drive 12A. Where the duty point is likely to shift, the belt-drive versions let you change the pulley ratio and re-tune fan speed instead of replacing the fan. 2-pole motors at 2,900 r/min suit high-flow duty; 4-pole and 6-pole motors are used where lower speed and quieter running matter more than maximum output.

Matched power ratings — 0.25 kW to 75 kW across the series
2, 4 and 6-pole options — speed chosen for the flow, pressure and noise target
Adjustable transmission ratio — belt drive lets you re-tune speed on site

Matched industrial motor for LWFDF4-72 centrifugal fan, rated for continuous ventilation operation

Low Vibration & Stable Operation

The balanced impeller and the optimized fan structure help reduce vibration and maintain smooth, stable operation during continuous use. Vibration is usually what wears a fan out first, so it is worth designing out from the start rather than correcting later.

Balanced rotating assembly

Impeller and shaft are balanced as a set, so less vibration reaches the casing and bearings.

Stiffened volute

A rigid casing does not drum or flex, which keeps the running tone low and steady.

One-piece mounting base

The load is spread evenly across the floor, so the unit stays level and does not shift.

Built for continuous duty

Suited to fans that run from opening to closing: canteen exhaust, plant ventilation, drying lines.

Three Configurations. One Reliable Solution.

Designed to match different air-gas handling requirements. The casing and impeller platform stays the same; motor, electrics and surface treatment are specified to suit the gas.

Standard

General Ventilation

The base build, used for everyday air exchange, supply and exhaust in workshops, warehouses, commercial buildings and canteens.

Explosion-Proof

Flammable Gas

Motor and electrical components specified for flammable gas duty, so the fan can be used where gas or solvent vapour may be present in the air stream.

Anti-Corrosion

Corrosive Gas

Casing and impeller finishes specified for corrosive gas exhaust, for chemical, plating, laboratory and waste-air lines.

Two Drive Configurations for Different Installation Needs

Select a suitable configuration according to the installation space, duct direction, equipment layout and maintenance requirements.

Type A | Direct Drive

Compact Structure, Space-Saving Installation

The motor sits on the fan shaft, so there is no belt to tension or replace and the footprint stays small — useful inside packaged units and tight plant rooms. Simple drive configuration, easy system integration. Covers sizes 2A to 7.1A with air volume up to 20,513 m³/h.

Type C | Belt Drive

Separate Motor Arrangement, Flexible Installation

The motor mounts on its own base and drives the fan through V-belts, so it can sit where there is room and the transmission ratio can be adjusted when the duty point changes. Suitable for industrial ventilation systems. Covers sizes 2.5A to 12A with air volume up to 75,552 m³/h.

Wide Industrial Applications

Covers a wide range of industrial and commercial ventilation scenarios — from general air exchange to flammable and corrosive gas handling.

Industrial Ventilation

Supply and exhaust air for production halls, assembly shops and fabrication areas.

Large building ventilation system served by LWFDF4-72 centrifugal fans

Large Buildings

Air exchange for malls, terminals, gyms and public buildings with long duct runs.

Commercial canteen kitchen exhaust hood ventilated by an LWFDF4-72 centrifugal fan

Restaurants & Canteens

Kitchen exhaust and make-up air for canteens, restaurants and food service areas.

General exhaust system ductwork with an LWFDF4-72 centrifugal fan

General Exhaust Systems

Everyday extraction of stale air, heat, dust and odour from working spaces.

Flammable Gas Ventilation

Air handling in areas where flammable gas or solvent vapour may be present.

Corrosive Gas Exhaust

Exhaust of corrosive fumes from chemical, plating and laboratory processes.

LONGWELL — Trusted Industrial Fan Manufacturer Since 1990

Founded in 1990 in Yuyao, Ningbo — the heart of China’s advanced manufacturing belt — LONGWELL has grown from a precision fan component workshop into a vertically integrated ventilation technology group. Today we engineer AC, DC and EC fan and motor systems with 4,000 m²+ of manufacturing floor, dedicated aerodynamics and CFD simulation labs, and a global export network spanning Europe, the Americas and Asia-Pacific.

From material selection to final balancing, every LONGWELL fan is built on automated lines, computer-balanced impellers and 100% run-test before shipment. We are certified to ISO 9001:2015 and ISO 14001, with CE, UL/ETL, RoHS and EAC compliance, and performance tested to the AMCA 210/211 method.

35+Years of Engineering

30+Countries Served

60+In-House R&D Engineers

5M+Fan Units Shipped / Year

Production & Delivery

Automated lines, computer-balanced impellers and a 100% run-test on every unit, so each LWFDF4-72 fan arrives ready to install.

LONGWELL production line and quality control — fan housings, motor assembly and computer-balanced impellers

LONGWELL export packaging and container loading — fans wrapped, crated and loaded into containers for global shipment

Global Market & Client Preference

The LWFDF4-72 series is specified by HVAC distributors, equipment manufacturers and OEM clients across Europe, the Middle East, Southeast Asia and South America.

LONGWELL global presence — regional offices and partners in USA, Germany, Spain, Poland, Russia, Turkey, China and Dubai

LONGWELL exhibition displays at international HVAC trade fairs with clients and partners

Trusted by Leading Global HVAC Brands

24+ HVAC OEMs and equipment builders rely on LONGWELL for industrial centrifugal fans every year.

Complete Range of Professional & Certified

LONGWELL fans are independently certified to international quality, safety and energy-efficiency standards.

LONGWELL certification badge ribbon: CE, RoHS, ETL, CCC, UL, LVD, EAC, ISO, BSCI

LONGWELL certificate grid: BSCI, CE, UL/ETL, FCC, ISO 45001:2018, ISO 9001:2015, ISO 14001:2015

Frequently Asked Questions

Quick technical answers about the LWFDF4-72 centrifugal fan series.

What is the LWFDF4-72 centrifugal fan used for?

The LWFDF4-72 series is used for industrial and commercial ventilation, air exchange and exhaust — factory workshops, large buildings, restaurant and canteen kitchens, general exhaust systems, flammable gas areas and corrosive gas exhaust lines.

What is the difference between Type A and Type C?

Type A is direct drive: the motor is mounted on the fan shaft, which keeps the unit compact and the drive simple. Type C is belt drive: the motor sits on a separate base and drives the fan through V-belts, so the motor position, outlet direction and transmission ratio can be adjusted to suit the installation. Type A covers sizes 2A to 7.1A; Type C covers 2.5A to 12A and the larger air volumes.

What air volume and total pressure can the LWFDF4-72 reach?

Air volume ranges from 412 m³/h on the smallest Type A model up to 75,552 m³/h on the belt-drive LWFDF4-72-12A-75-4P. Total pressure ranges from 198 Pa up to 3,209 Pa.

Which configurations are available for different gases?

Three configurations are offered from one fan platform: Standard for general ventilation, Explosion-Proof for flammable gas, and Anti-Corrosion for corrosive gas. Motor, electrical parts and surface treatment are specified according to the air-gas condition on site.

What speed and motor power options does the series support?

Fan speed runs from 500 r/min up to 2,900 r/min depending on model and motor pole count. Matching motor power runs from 0.25 kW to 75 kW, with 2-pole, 4-pole and 6-pole motors available so the fan can be matched to the required flow, pressure and noise level.

Does LONGWELL offer OEM or custom options for the LWFDF4-72?

Yes. LONGWELL provides OEM/ODM support including custom casing and flange dimensions, mounting base changes, motor and voltage matching, special coatings for corrosive duty, and private label branding.

Need a Quote or Custom Specs?

Send us the air volume, total pressure and installation layout. Our engineers will match the right LWFDF4-72 model, drive type and configuration, and reply within 24 hours.

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