Axial fans ВО 25-188

№8	№9
№10	№11,2
№12,5

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General information

• low Pressure

• One-side suction

• Number of blades – 6

Fans ВО 25-188 are designated for antismoke ventilating systems; they are installed in the special air-supply and smoke-exhaust systems for generation of an excess pressure in stairway enclosures, entries, gateways and elevators’ wells of the buildings in order to prevent smoke ingress into these premises and provide a possibility to perform activities on fire-fighting and rescue of people and equipment.

Fan ВО 25-188 has two layouts, which are different by a way of shell mounting: flange mounting (layout 1) and mounting on a pillar (layout 2).

Each fan has a size 5 versions, differing position of the blades of the impeller and guide vanes.

The angle of the vanes of the impeller – 30? и35?

The installation angle guide blades – 5? и10?

Ability to work without the fan blades guide

Fans ВО 25-188 must be mounted out of attended premises and beyond the area where people stay permanently. They are designated for operationin the conditions of moderate (У) and tropical (Т) climates of the 3rdcategory of location as per GOST 15150.

• Ambient temperature: -40 to +45 ° С(-10 to +50 ° Сfor fans designated for tropical climate).

• In ordinary conditions transferred medium shouldnot contain adhesive substances, fibrous materials, steam or dust, have an aggressiveness towards carbon steels higher than air aggressiveness; content of dust and other solid admixtures should be more than 100 mg/m3.

• Average value of vibration velocity for externalvibration sources in the places of fans’ mounting – not more than 2 mm/sec.

Specifications of axial fans ВО 25-188

Fan No.	Modificat ion	The angle of the blades, degree		Еlectric motor		Parameters in operating area		Weight, kg		Fan volume, m?/hour
		Rotor	Guide vanes	Motor power, KW	Rate of impeller rotation, min-1	Capacity 10? х m?/hour	Total pressure, Pa	Weight, kg
								Layout
								01	02
8	01	35	10	11,0	1435	25,5-32,0	840-660	182	193	0,4
	02	35	5	7,5	1455	22,5-30,0	740-570	170	181
	03	35	*	5,5	1450	18,5-27,3	585-475	124	135
	04	30	5	5,5	1450	20,5-27,2	700-418	159	180
	05	30	*	4,0	1435	17,3-22,3	510-308	102	113
9	01	35	10	11,0	1435	29,3-45,0	710-430	237	253	0,5
	02	35	5	11,0	1435	27,5-41,5	670-395	237	253
	03	35	*	7,5	1455	26,4-40,4	635-340	178	194
	04	30	5	7,5	1455	23,5-38,0	645-305	221	237
	05	30	*	7,5	1455	21,8-35,0	585-250	138	194
10	01	35	10	15,0	1460	41,5-62,5	910-555	304	324	0,8
	02	35	5	15,0	1460	38,4-58,4	855-505	304	324
	03	35	*	15,0	1460	36,3-55,4	785-425	256	276
	04	30	5	11,0	1435	31,6-51,4	770-365	260	280
	05	30	*	11,0	1435	47,5-27,5	700-303	212	232
11,2	01	35	10	7,5	960	38,0-57,7	490-300	284	311	0,9
	02	35	5	7,5	960	35,3-54,0	463-273	284	311
	03	35	*	7,5	960	33,5-51,0	425-230	233	260
	04	30	5	5,5	950	29,5-47,7	423-203	268	295
	05	30	*	5,5	950	27,5-44,0	385-130	218	245
12,5	01	35	10	15,0	970	53,5-81,0	625-384	407	440	1,3
	02	35	5	15,0	970	49,5-75,0	590-347	407	440
	03	35	*	15,0	970	47,0-71,5	540-292	347	380
	04	30	5	11,0	970	41,7-67,7	550-260	377	410
	05	30	*	11,0	970	39,0-62,5	500-215	317	350

Overall and mounting dimensions of fans ВО 25-188

Overall and mounting dimensions of axial fans ВО 25-188

Fan No.	Dimensions, mm													N
Fan No.	А	А1	B	D	D1	D2	d	d1	H	H1	Lmax	L1	L2	N
8	700	310	740	820	504	865	18	14	945	495	565	410	260	16
9	800	350	846	900	504	940	18	10	1040	550	565	450	260	12
10	900	415	946	1000	504	1040	20	14	1140	595	735	485	225	16
11,2	1000	460	1060	1120	570	1170	22	10	1270	670	635	560	225	16
12,5	1100	530	1160	1250	627	1295	22	10	1422	750	785	630	225	16

Aerodynamic characteristic of fans ВО 25-188

ВО 25-188 №8

ВО 25-188 №9

ВО 25-188 №10

ВО 25-188 №11,2

ВО 25-188 №12,5

Acoustic characteristics of fans ВО 25-188

Acoustic characteristics measured on the pressure side to the nominal operation of the fans axial ВО 25-188 №8

№modification.	LpA, дБА	The value of Lpi, dB in the octave band f, Hz
№modification.	LpA, дБА	63	125	250	500	1000	2000	4000	8000
1	107	92	97	105	105	103	96	90	83
2	105	86	94	104	104	101	95	88	83
3	105	86	93	104	103	102	95	88	83
4	103	82	92	102	101	99	94	85	78
5	103	84	92	103	102	98	92	84	76

Acoustic characteristics measured on the pressure side to the nominal operation of the fans axial ВО 25-188 №9

№modification	LpA, дБА	The value of Lpi, dB in the octave band f, Hz
№modification	LpA, дБА	63	125	250	500	1000	2000	4000	8000
1	111	97	102	110	110	108	101	95	88
2	110	97	102	110	109	106	100	94	86
3	110	91	98	109	108	107	100	93	87
4	108	88	97	107	106	103	97	90	82
5	107	89	97	108	107	102	96	89	81

Acoustic characteristics measured on the pressure side to the nominal operation of the fans axial ВО 25-188 №10

№modification	LpA, дБА	The value of Lpi, dB in the octave band f, Hz
№modification	LpA, дБА	63	125	250	500	1000	2000	4000	8000
1	114	100	105	113	113	111	104	98	91
2	113	100	105	113	112	109	103	97	89
3	113	94	101	112	111	110	103	96	90
4	111	91	100	110	109	106	100	93	85
5	110	92	100	111	110	105	99	92	84

АAcoustic characteristics measured on the pressure side to the nominal operation of the fans axial ВО 25-188 №11,2

№modification	LpA, дБА	The value of Lpi, dB in the octave band f, Hz
№modification	LpA, дБА	63	125	250	500	1000	2000	4000	8000
1	108	94	99	107	107	105	98	92	85
2	107	94	99	107	106	103	97	91	83
3	107	88	95	106	105	104	97	90	84
4	105	85	94	104	103	100	94	87	79
5	104	86	94	105	104	99	93	86	78

Acoustic characteristics measured on the pressure side to the nominal operation of the fans axial ВО 25-188 №12,5

№modification	LpA, дБА	The value of Lpi, dB in the octave band f, Hz
№modification	LpA, дБА	63	125	250	500	1000	2000	4000	8000
1	112	98	103	111	111	109	102	96	89
2	111	98	103	111	110	107	101	95	87
3	111	92	99	110	109	108	101	94	88
4	109	89	98	108	107	104	98	91	83
5	108	90	98	109	108	103	97	90	82