Name: DFBZ Series Square Wall-Mounted Axial Flow Fans
SKU: -1

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Fan Features

The DFBZ and BDFBZ series new axial fans are an improved design based on the T35-11 series axial fans. They are new exhaust fans suitable for wall mounting. In addition to retaining all the performance characteristics and advantages of the T35-11 series fans, they offer the following features:

(1) Stable operation and airflow, ensuring even airflow into and out of the fan.

(2) Low vibration and noise: Strict quality controls are applied to the manufacture of the fan’s key components, reducing vibration and noise to low levels. The measured effective vibration velocity is 1.3 mm/s (standard: 6.3 mm/s²), and the A-weighted sound pressure level is 30.4 dB(A) (standard: 38 dB(A)).

(3) Protection against rain and natural wind backflow: A gravity louver is fitted at the fan outlet. Its counterweight is adjusted during manufacture. When the fan stops, the air valve closes automatically to prevent rainwater and natural wind from entering the room. When the fan is running, the airflow opens the gravity louver automatically.

(4) Easy installation: The fan casing is square. During building design, a square opening is reserved in the wall according to the fan model. The fan is inserted into the wall opening from the outside. A rubber sheet is placed between the fan and the wall, and the gap is filled with cement mortar. The mounting plate is then secured with M10 expansion bolts to clamp the gravity-louver flange.

Applications and Operating Conditions

(1) These fans are widely used for ventilation in power plants, substations, general factories, warehouses, offices, and residences.

(2) The gas conveyed by the fan must be free of sticky substances, fibrous materials, and significant dust.

(3) The gas temperature must not exceed 40°C.

Models and Applications

(1) DFBZ series: Steel axial fans for exhausting air or other non-corrosive gases.

(2) BDFBZ series: Explosion-proof axial fans with steel casings and aluminum impellers, for exhausting flammable or explosive gases that are non-corrosive.

Fan Specifications

Each fan series is available in three speeds (see the performance data tables), with impeller peripheral speed not exceeding 60 m/s. There are 13 impeller diameters, from small to large: 2.8, 3.15, 3.55, 4, 4.5, 5, 5.6, 6.3, 7.1, 8, 9, 10, and 11.2. Each size has five impeller blade installation angles: 15°, 20°, 25°, 30°, and 35°. Airflow ranges from 552 to 58,343 m³/h, and pressure from 32 to 420 Pa. Explosion-proof axial fans have an airflow range of 550 to 58,300 m³/h and a pressure range of 30 to 390 Pa, offering a wide operating range and selection.

Fan Construction

(1) Fans of the same model number and size in each series have identical overall dimensions. Each fan consists of an impeller, a circular-inlet/square-outlet casing, a collector, a safety guard, a gravity louver, and a motor.

(2) The fan collector is formed in one piece with a curved, streamlined profile to reduce airflow inlet losses.

(3) Improved YSF and YBF series motors designed specifically for fans are used to increase efficiency.

Fan Performance

Performance Data for DFBZ Axial Fans

Machine No. No	Impeller diameter (mm)	Impeller Peripheral Speed (m/s)	Spindle Speed (r/min)	Blade Angle (deg)	Flow Rate (m³/h)	Total pressure Pa)	Total Pressure Efficiency (%)	Required shaft power (kW)	Selected shaft power (kW)	Motor Power (kW)	Approx. Weight /kg
2.8	280	42.5	2900	15	1224	128	0.64	0.068	0.078	0.120	22
				20	1742	141	0.68	0.100	0.115	0.180
				25	2360	143	0.69	0.147	0.169	0.180
				30	2495	165	0.68	0.168	0.193	0.250
				35	2778	186	0.64	0.224	0.258	0.370
		21.5	1450	15	613	32	0.64	0.0085	0.0097	0.025	18
				20	873	35.2	0.68	0.0126	0.015	0.025
				25	1133	35.7	0.69	0.0163	0.019	0.025
				30	1251	41.2	0.68	0.021	0.024	0.040
				35	1392	46.6	0.64	0.0282	0.032	0.040
3.15	315	47.8	2900	15	1944	170.1	0.67	0.137	0.158	0.180	26
				20	2681	186.6	0.71	0.196	0.225	0.250
				25	3418	189.2	0.72	0.250	0.288	0.370
				30	3753	217.7	0.71	0.320	0.368	0.370
				35	4155	247	0.67	0.425	0.489	0.550
		23.9	1450	15	972	42.5	0.67	0.017	0.020	0.025	20
				20	1340	46.6	0.71	0.024	0.028	0.040
				25	1709	47.2	0.72	0.031	0.036	0.040
				30	1877	54.9	0.71	0.040	0.046	0.060
				35	2087	61.7	0.72	0.053	0.061	0.090
3.55	355	53.9 27.0	2900	15	2783	216.1	0.67	0.249	0.286	0.370	38
				20	3839	237	0.71	0.356	0.409	0.550
				25	4895	240.3	0.72	0.454	0.523	0.550
				30	5375	279	0.71	0.587	0.673	0.750
				35	5951	313.6	0.67	0.77	0.886	1.1
			1450	15	1394	54	0.67	0.031	0.036	0.040	25
				20	1923	59.2	0.71	0.045	0.052	0.060
				25	2452	60.2	0.72	0.057	0.066	0.090
				30	2692	69.7	0.71	0.074	0.085	0.090
				35	2981	78.4	0.67	0.095	0.109	0.120
4	400	60.7	2900	15	3980	274.3	0.67	0.453	0.521	0.550	46
				20	5489	300.9	0.71	0.646	0.743	1.1
				25	6999	305.1	0.72	0.824	0.948	1.1
				30	7685	354	0.71	1.064	1.224	1.5
				35	8500	398.2	0.67	1.384	1.592	2.2
		30.4	1450	15	1993	68.6	0.67	0.057	0.066	0.090	32
				20	2749	75.2	0.71	0.081	0.093	0.120
				25	3505	76.2	0.72	0.103	0.118	0.120
				30	3849	88.5	0.71	0.141	0.162	0.180
				35	4261	99.5	0.67	0.173	0.199	0.250
4.5	450	34.2	1450	15	2838	35.8	0.67	0.102	0.117	0.120	40
				20	3914	95.2	0.71	0.146	0.168	0.180
				25	4991	96.2	0.72	0.186	0.214	0.250
				30	5480	112	0.71	0.240	0.276	0.370
				35	6067	126	0.67	0.317	0.364	0.370
5	500	38.0	1450	15	4289	112.6	0.71	0.189	0.217	0.250	50
				20	5763	124.8	0.75	0.266	0.306	0.370
				25	7273	129.6	0.77	0.338	0.389	0.550
				30	7907	145.6	0.75	0.426	0.490	0.550
				35	8712	164.6	0.71	0.561	0.645	0.750
		25.1	960	15	2839	49.1	0.71	0.055	0.0633	0.370	48
				20	3815	54.4	0.75	0.077	0.089	0.370
				25	4972	56.8	0.77	0.098	0.112	0.370
				30	5235	63.5	0.75	0.123	0.141	0.370
				35	5768	71.8	0.71	0.162	0.186	0.370

Performance Data for DFBZ Axial Fans (Continued)

Machine No. No	Impeller Diameter (mm)	Impeller Peripheral Speed (m/s)	Spindle Speed (r/min)	Blade Angle (deg)	Airflow (m³/h)	Total Pressure (Pa)	Total Pressure Efficiency (%)	Required Shaft Power (kW)	Adopted Shaft Power (kW)	Motor Power (kW)	Approx. Weight /kg
5.6	560	42.5	1450	15	6025	140.9	0.71	0.332	0.382	0.370	67
				20	8097	156.1	0.75	0.468	0.538	0.550
				25	10168	162.6	0.77	0.590	0.686	0.750
				30	11110	182.1	0.75	0.749	0.861	1.1
				35	12239	206	0.71	0.986	1.137	1.1
		28.1	960	15	3989	61.8	0.71	0.096	0.110	0.370	61
				20	5361	68.4	0.75	0.136	0.156	0.370
				25	6732	71.3	0.77	0.173	0.199	0.370
				30	7355	79.8	0.75	0.210	0.241	0.370
				35	8103	90.3	0.71	0.286	0.329	0.370
6.3	630	47.8	1450	15	8579	178.3	0.71	0.598	0.688	0.750	90
				20	11528	197.6	0.75	0.844	0.971	1.1
				25	14477	205.8	0.77	1.075	1.236	1.5
				30	15817	230.5	0.75	1.350	1.533	1.5
				35	17426	260.7	0.71	1.777	2.044	2.2
		31.7	960	15	5680	78.2	0.71	0.174	2.00	0.370	76
				20	7632	86.6	0.75	0.245	0.282	0.370
				25	9585	90.2	0.77	0.312	0.359	0.370
				30	10472	101.0	0.75	0.392	0.451	0.750
				35	11534	114.3	0.71	0.516	0.680	0.750
7.1	710	53.9	1450	15	12280	226.5	0.71	1.088	1.251	1.5	115
				20	16561	250.9	0.75	1.533	1.763	2.2
				25	20722	261.4	0.77	1.954	2.247	3
				30	22641	292.7	0.75	2.454	2.822	3
				35	24944	331.1	0.71	3.23	3.715	4
		35.7	960	15	8130	99.3	0.71	0.316	0.363	0.75	91
				20	10925	110	0.75	0.445	0.512	0.75
				25	13720	114.6	0.77	0.567	0.652	0.75
				30	14990	128.4	0.75	0.713	0.820	1.1
				35	16514	145.2	0.71	0.938	1.079	1.1
8	800	60.7	1450	15	17567	287.6	0.71	1.976	2.272	3	165
				20	23605	318.6	0.75	2.785	3.203	4
				25	29644	331.8	0.77	3.548	4.081	5.5
				30	32389	371.6	0.75	4.458	5.127	5.5
				35	35682	420.3	0.71	5.867	6.747	7.5
		40.2	960	15	11630	126.1	0.71	0.574	0.660	0.75	130
				20	15628	139.6	0.75	0.808	0.929	1.1
				25	19626	145.4	0.77	0.928	1.067	1.1
				30	21444	162.9	0.75	1.294	1.488	1.5
				35	23624	184.2	0.71	1.703	1.958	2.2
9	900	45.2	960	15	16560	159.5	0.71	1.034	1.189	1.5	175
				20	22252	176.7	0.75	1.456	1.674	2.2
				25	27944	184.1	0.77	1.856	2.134	2.2
				30	30532	206.2	0.75	2.331	2.680	3
				35	33937	233.2	0.71	3.069	3.529	4
10	1000	50.3	960	15	22716	197	0.71	1.75	2.013	2.2	230
				20	30524	218.2	0.75	2.467	2.837	3
				25	38333	227.3	0.77	3.143	3.615	4
				30	41882	254.5	0.75	3.948	4.54	5.5
				35	46141	287.9	0.71	5.197	5.976	7.5
11.2	1120	56.3	960	15	31914	247	0.71	3.085	3.548	4	245
				20	42884	273.7	0.75	4.347	5.000	5.5
				25	53855	285.1	0.77	5.539	6.370	7.5
				30	58841	319.3	0.75	6.958	8.002	11
				35	64825	361.1	0.71	9.158	10.532	11

Performance Data Table for BDFBZ Series Explosion-Proof Axial Fans

Machine No. No	Impeller Diameter (mm)	Impeller Peripheral Speed (m/s)	Shaft speed r/min)	Blade Angle (deg)	Flow Rate (m³/h)	Total Pressure (Pa)	Total Pressure Efficiency (%)	Required Shaft Power (kW)	Selected shaft power (kW)	Motor Power (kW)	Approx. Weight /kg
2.8	280	42.5	2900	15	1102	122	0.64	0.058	0.067	0.180	29
				20	1568	134	0.68	0.086	0.099	0.180
				25	2304	136	0.69	0.087	0.100	0.180
				30	2246	157	0.68	0.144	0.166	0.180
				35	2500	177	0.64	0.192	0.221	0.250
		21.5	1450	15	552	30	0.64	0.007	0.008	0.120	25
				20	786	33	0.68	0.010	0.012	0.120
				25	1020	34	0.69	0.014	0.016	0.120
				30	1126	39	0.68	0.018	0.021	0.120
				35	1253	44	0.64	0.024	0.028	0.120
3.15	315	47.8	2900	15	1750	162	0.67	0.117	0.135	0.180	33
				20	2413	177	0.71	0.167	0.192	0.250
				25	3076	180	0.72	0.213	0.245	0.370
				30	3378	207	0.71	0.273	0.314	0.370
				35	3739	235	0.67	0.364	0.419	0.550
		23.9	1450	15	875	40	0.67	0.015	0.017	0.120	27
				20	1206	44	0.71	0.021	0.024	0.120
				25	1538	45	0.72	0.027	0.031	0.120
				30	1689	52	0.71	0.035	0.040	0.120
				35	1870	59	0.67	0.045	0.052	0.120
3.55	355	53.9	2900	15	2505	205	0.67	0.213	0.245	0.370	46
				20	3455	225	0.71	0.304	0.350	0.550
				25	4406	237	0.72	0.403	0.463	0.550
				30	4838	265	0.71	0.502	0.577	0.750
				35	5356	298	0.67	0.640	0.736	1.100
		27.0	1450	15	1255	51	0.67	0.027	0.031	0.120	33
				20	1731	56	0.71	0.038	0.044	0.120
				25	2207	65	0.72	0.055	0.063	0.120
				30	2423	66	0.71	0.063	0.072	0.120
				35	2683	75	0.67	0.083	0.095	0.120
4	400	60.7	2900	15	3582	261	0.67	0.388	0.446	0.550	54
				20	4935	286	0.71	0.403	0.463	1.100
				25	6299	290	0.72	0.704	0.810	1.100
				30	6916	336	0.71	0.910	1.050	1.100
				35	7657	378	0.67	1.200	1.380	1.500
		30.4	1450	15	1794	65	0.67	0.0485	0.056	0.120	40
				20	2474	71	0.71	0.069	0.080	0.120
				25	3155	72	0.72	0.088	0.101	0.120
				30	3464	84	0.71	0.114	0.131	0.180
				35	3835	95	0.67	0.150	0.173	0.250
4.5	450	34.2	1450	15	2554	82	0.67	0.09	0.10	0.120	48
				20	3523	90	0.71	0.11	0.13	0.180
				25	4492	92	0.72	0.16	0.18	0.250
				30	4932	106	0.71	0.21	0.24	0.370
				35	5460	120	0.67	0.27	0.31	0.370
5	500	38.0	1450	15	3860	107	0.71	0.16	0.19	0.250	58
				20	5187	119	0.75	0.23	0.26	0.370
				25	6513	123	0.77	0.29	0.33	0.370
				30	7136	138	0.75	0.37	0.42	0.550
				35	7841	156	0.71	0.42	0.49	0.750
		25.1	960	15	2555	47	0.71	0.05	0.05	0.370	56
				20	3434	52	0.75	0.66	0.76	0.370
				25	4313	54	0.77	0.84	0.97	0.370
				30	4712	60	0.75	0.11	0.13	0.370
				35	5191	68	0.71	0.14	0.16	0.370

Performance Data Table for BDFBZ Series Explosion-Proof Axial Fans (Continued)

Machine No. No	Impeller Diameter (mm)	Impeller Peripheral Speed (m/s)	Spindle Speed (r/min)	Blade Angle (deg)	Flow Rate (m³/h)	Total Pressure (Pa)	Total Pressure Efficiency (%)	Required Shaft Power (kW)	Adopted Shaft Power (kW)	Motor Power (kW)	Approx. Weight /kg
5.6	560	42.5	1450	15	5423	134	0.71	0.28	0.33	0.370	77
				20	7287	148	0.75	0.40	0.46	0.550
				25	9151	154	0.77	0.51	0.59	0.750
				30	9999	173	0.75	0.64	0.74	1.1
				35	11015	196	0.71	0.84	0.97	1.1
		28.1	960	15	3590	59	0.71	0.08	0.095	0.370	71
				20	4825	65	0.75	0.12	0.13	0.370
				25	6059	68	0.77	0.15	0.17	0.370
				30	6620	76	0.75	0.19	0.21	0.370
				35	7293	86	0.71	0.25	0.28	0.370
6.3	630	47.8	1450	15	7721	169	0.71	0.51	0.59	0.750	100
				20	10375	188	0.75	0.72	0.83	1.1
				25	13029	196	0.77	0.92	1.06	1.5
				30	14235	219	0.75	1.16	1.33	1.5
				35	15683	248	0.71	1.52	1.75	2.2
		31.7	960	15	5112	74	0.71	0.15	0.17	0.370	86
				20	6869	82	0.75	0.21	0.24	0.370
				25	8627	86	0.77	0.27	0.31	0.370
				30	9425	96	0.75	0.34	0.39	0.750
				35	10384	109	0.71	0.44	0.51	0.750
7.1	710	53.9	1450	15	11052	215	0.71	0.93	1.07	1.5	126
				20	14851	238	0.75	1.31	1.51	2.2
				25	18650	248	0.77	1.67	1.92	2.2
				30	20377	278	0.75	2.10	2.42	3
				35	22450	315	0.71	2.77	3.19	4
		35.7	960	15	7317	94	0.71	0.27	0.31	0.75	102
				20	9833	105	0.75	0.38	0.44	0.75
				25	12348	109	0.77	0.49	0.56	0.75
				30	13491	122	0.75	0.61	0.71	0.75
				35	14863	138	0.71	0.80	0.92	1.1
8	800	60.7	1450	15	15870	273	0.71	1.69	1.94	2.2	185
				20	21245	303	0.75	2.41	2.77	4
				25	26680	315	0.77	3.03	3.48	4
				30	29150	353	0.75	3.81	4.38	5.5
				35	32114	399	0.71	5.01	5.76	7.5
		40.2	960	15	10467	120	0.71	0.49	0.56	0.750	150
				20	14065	133	0.75	0.69	0.79	1.1
				25	17663	133	0.77	0.80	0.92	1.5
				30	19299	155	0.75	1.11	1.28	1.5
				35	21262	175	0.71	1.40	1.68	2.2
9	900	45.2	960	15	14904	152	0.71	0.89	1.02	1.5	190
				20	20027	169	0.75	1.25	1.44	2.2
				25	25150	175	0.77	1.59	1.83	2.2
				30	27479	196	0.75	1.99	2.29	3
				35	30273	222	0.71	2.63	3.02	4
10	1000	50.3	960	15	20444	187	0.71	1.50	1.73	2.2	255
				20	27472	207	0.75	2.11	2.42	3
				25	34500	216	0.77	2.69	3.09	4
				30	37694	242	0.75	3.38	3.89	4
				35	41527	274	0.71	4.45	5.12	7.5
11.2	1120	56.3	960	15	28723	235	0.71	2.64	3.04	4	280
				20	38596	260	0.75	3.72	4.28	5.5
				25	48470	271	0.77	4.74	5.45	7.5
				30	52957	303	0.75	5.94	6.83	7.5
				35	58343	341	0.71	7.78	8.95	11

Overall Dimensions and Installation Opening Dimensions for DFBZ Series Axial Fans

Overall and Installation Dimensions for DFBZ/BDFBZ No. 2.8–11.2 Axial Fans

Dimensions / Machine No.	①	A	B	E
2.8	283	380	340	345
3.15	318	415	375	345
3.55	358	455	415	370
4	404	500	460	390
4.5	454	560	510	390
5	505	610	560	390
5.6	565	670	620	400
6.3	636	740	690	425
7.1	716	820	770	465
8	806	930	860	500
9	910	1030	960	600
10	1010	1130	1060	700
11.2	1130	1250	1180	750

Note: The BDFBZ model has the same dimensions as the standard model. The motor is exposed for convenient wiring. Please discuss and confirm any special requirements in advance.

Frequently Asked Questions

DFBZ Series Square Wall-Mounted Axial Flow Fans

Please provide the model, airflow, total/static pressure, installation orientation, air inlet and outlet configuration, material, insulation, motor voltage/frequency, control method, filter module, smoke control and fire protection requirements, quantity, and packaging requirements. Performance, dimensions, and certification information are subject to the confirmed product and order documents.

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