Highly efficient cell folded HEPA filters type FyaS classes H11-H14

Cell folded filters type FyaS (class of HEPA, ULPA filters) are designed for highly efficient (final) air purification and sterilizing filtration in medical institutions, pharmaceutical industry enterprises, as well as in clean rooms of other industries (microelectronics, microbiology, food, etc. .). Filters can be used to replace LAIK filters with filter material FPP, FPA, because have higher efficiency and operational reliability. Filters can also be used to clean exhaust air from dangerous microorganisms and radioactive aerosols in biological laboratories, nuclear power plants, etc.

Design of FyaS filters (class to HEPA, ULPA)

FyaS filters consist of a housing, inside of which filter material is laid in folds. To prevent adjacent folds from sticking together, separators made of aluminum foil or special threads are placed between them and glued to the surface of the filter material. The filter housing can be made of a special aluminum profile, aluminum or stainless steel sheet or sanded plywood. Filters made of aluminum profiles can be made with a depth of 78; 150 and 300 mm. In cases where the filter housing is made of plywood, aluminum or stainless steel sheet, the depth of the filters may be different from that indicated above. The filter material, including aluminum or filament separators, is sealed in the housing by pouring a special sealant around the entire perimeter. The filter housing forms a flange (pressing surface) around the entire perimeter, the size of which for an aluminum profile is 15mm, for plywood 12mm, and for a housing made of aluminum and stainless steel sheets 18mm. A rubber seal is glued to this flange (on one or both sides). It should be noted that when choosing filters installed in the structure of the cleanest room (ceiling, walls), through which air is supplied in laminar mode (velocity in the filter no more than 0.45 m/s), it is advisable to install filters with thread separators.

Selecting a filter based on its characteristics

FyaS filters with aluminum separators are produced with basic depth dimensions of 150 and 300 (292) mm. These filters are manufactured in 2 variants:
– basic with the amount of filter material indicated in the table. 1;
– economical, in which the increase in filter surface area compared to a basic filter with a depth of 150 mm is about 1.3 times, and for filters with a depth of 300 (292) mm – 1.5 times (Table 1).

The advantages of an economical filter are lower initial aerodynamic resistance, as well as an increased service life, which, according to operating experience, for filters with a depth of 150 mm can be 1.5-1.7 times longer, and for filters with a depth of 300 (292) mm, 1.8 -2.0 times compared to the base case. Filters with thread separators are currently produced only in an economical version with a housing depth of 78, and a similar filter package can be installed in a housing with a depth of 150 mm to replace filters with aluminum separators in an economical version.

It should be noted that most manufacturers produce filters with a filtration surface corresponding to the base one, which you need to pay attention to when choosing filters.

Table 1

Overall dimensions of the inlet section, mm	Filter surface area, m2
	depth 150 mm		depth 300 (292) mm
	base	economical	base	economical
305×305	2.0	2.6	3.5	5.2
530×530	6.4	8.4	11.2	16.8
305×610	4.2	5.4	7.2	10.8
530×1130	14.0	18.3	24.4	36.6
610×610	8.4	11.0	14.6	22.0
610×1220	17.4	22.7	30.2	45.4
460×920	9.8	12.8	17.0	25.6

Technical characteristics of FyaS filters

The main technical characteristics of filters of the FyaS type are given in table. 2, 3, 4 and 5.

table 2

Filter class FyaS according to GOST R 51251-99 (EN 1822)	Nominal specific air load m3/h, per m2 of inlet cross-sectional area (velocity through the filter, m/s)		Efficiency *, % not less	Aerodynamic resistance, Pa**
				initial					recommended final
				for filters with thread separators (economical)	for filters with aluminum separators
					depth 150		depth 300 (292)
	78 (150)	300 (292)			base	economical	base	economical
H11	1620(0.45)	5375(1.49)	95	55	65	50	135	120	600
H13	1620(0.45)	5375(1.49)	99.95	105	130	100	250	190	600
H14	1620(0.45)	5375(1.49)	99.995	140	150	120	300	230	600

* – efficiency is determined according to the methodology of the European standard EN 1822

The temperature of the air being purified should be in the range from -40° to +40° C and the relative humidity no more than 95%. The environment and filtered air must not contain aggressive gases and vapors. The filter should reach operating mode (reach the required efficiency) no more than 2 hours from the start of purging. The performance of filters (main standard sizes) is given in table. 3; 4 and 5.

Table 3

Description of the gab. FyaS filter sizes	Cleaning class according to GOST R 51251-99	Nominal capacity, m3/h	Initial resistance at rated capacity, Pa		Produce at maximum start. resistance 250 Pa, m3/h		Overall dimensions, mm
							height	width	depth
			base	economical	base	economical
0 05	H11	150	–	55	–	688	305	305	78
0 02		450	–	55	–	2063	530	530	78
0 5		300	–	55	–	1375	610	305	78
0 04		970	–	55	–	4446	530	1130	78
0 6		600	–	55	–	2750	610	610	78
0 03		1200	–	55	–	5500	610	1220	78
1 05		150	65	50	500	700	305	305	150
1 02		450	65	50	1500	2100	530	530	150
15		300	65	50	1000	1400	610	305	150
1 04		900	65	50	3000	4200	530	1130	150
16		600	65	50	2000	2800	610	610	150
1 03		1200	65	50	4000	5600	610	1220	150
3 09		2300	130	120	3910	4255	460	920	300 (310)
3 05		500	130	120	850	925	305	305	300 (292)
3 02		1500	130	120	2550	2775	530	530	300 (292)
3 5		1000	130	120	1700	1850	610	305	300 (292)
3 6		2000	130	120	3400	3700	610	610	300 (292)
3 03		4000	130	120	6800	7400	610	1220	300 (292)

Table 4

Description of the gab. FYAS filter sizes	Cleaning class according to GOST R 51251-99	Nominal capacity, m3/h	Initial resistance at rated performance, Pa		Productivity at maximum start. resistance 250 Pa, m3/h		Overall dimensions, mm
							height	width	depth
			base	economical	base	economical
0 05	H13	150	–	105	–	350	305	305	78
0 02		450	–	105	–	1050	530	530	78
0 5		300	–	105	–	700	610	305	78
0 04		970	–	105	–	2263	530	1130	78
0 6		600	–	105	–	1400	610	610	78
0 03		1200	–	105	–	2800	610	1220	78
1 05		150	130	50	288	363	305	305	150
1 02		450	130	50	863	1088	530	530	150
15		300	130	50	575	725	610	305	150
1 04		900	130	50	1725	2175	530	1130	150
16		600	130	50	1150	1450	610	610	150
1 03		1200	130	50	2300	2900	610	1220	150
3 09		2300	250	120	2300	2875	460	920	300 (310)
3 05		500	250	120	500	625	305	305	300 (292)
3 02		1500	250	120	1500	1875	530	530	300 (292)
3 5		1000	250	120	1000	1250	610	305	300 (292)
3 6		2000	250	120	2000	2500	610	610	300 (292)
3 03		4000	250	120	4000	5000	610	1220	300 (292)

Table 5

Designation of overall dimensions of the filter FyaS	Cleaning class according to GOST R 51251-99	Nominal capacity, m3/h	Initial resistance at rated performance, Pa		Overall dimensions, mm
					height	width	depth
			base	economical
0 05	H14	150	–	140	305	305	78
0 02		450	–	140	530	530	78
0 5		300	–	140	610	305	78
0 04		970	–	140	530	1130	78
0 6		600	–	140	610	610	78
0 03		1200	–	140	610	1220	78
1 05		150	150	120	305	305	150
1 02		450	150	120	530	530	150
15		300	150	120	610	305	150
1 04		900	150	120	530	1130	150
16		600	150	120	610	610	150
1 03		1200	150	120	610	1220	150
3 09		2300	300	240	460	920	300 (310)
3 05		500	300	240	305	305	300 (292)
3 02		1500	300	240	530	530	300 (292)
3 5		1000	300	240	610	305	300 (292)
3 6		2000	300	240	610	610	300 (292)
3 03		4000	300	240	610	1220	300 (292)

Filter markings

As mentioned earlier, FyaS filters can be manufactured in various designs:
housing type (aluminum, plywood, stainless steel);
separators (aluminum, thread);
cleaning class (H10 – H14); rubber seal (on one or 2 sides);
overall dimensions along the inlet section and depth;
amount of filter material (basic and economical);
the presence or absence of a grate at the outlet of the filter.

An example of marking a typical filter for placing an order FyaS – E 13 N 0 05. 3 A

Table 6

Explanation of the designation	Possible options
“E” – designation of manufacturing option based on the amount of filter material	“E” – economical											“__” – no index – basic
“13” – digital designation of the cleaning class according to GOST R 51251-99	10; eleven; 12; 13; 14
“N” – type of separators	“N” – thread					“C” – aluminum foil separators
“0” – single digit – designation of filter depth	depth, mm								78				150				292				300			310
	designation								0				1				2				3			4
“05” – two-digit or single-digit number – designation of the dimensions of the inlet section	Size, mm width height			305 305			610 305				610 610				530 530			1130 530				920 460			1220 610
	designation			05			5				6				02			04				09			03
“3” – single digit – designation of the location of the sealing gaskets and the presence of a grid at the outlet	Option	no seal			inlet seal					outlet seal						seal on both sides				inlet seal; output grid
	designation	0			1					2						3				4
“A” – designation of body material	Material type		aluminum sheet					aluminum profile						sanded plywood					stainless steel sheet				galvanized sheet
	designation		A					P						F					N				WITH

An example of marking a non-standard filter for placing an order FyaS – 13 S 635x570x470. ZF

Explanation:

• 13 – cleaning class according to GOST R 51251-99 – “H13”;
• C – separators made of aluminum foil;
• 635x570x470 – overall dimensions (width x height x depth) mm;
• 3 – sealing on 2 sides;
• F – filter housing made of polished plywood.

Maintenance of analog HEPA, ULPA filters

During operation of the filter, its aerodynamic resistance should be monitored using pressure gauge readings. The filter must be replaced when the pressure drop reaches: specified in the passport; selected in the project; based on the available pressure in the ventilation system. When installing filters with rubber seals, the clamping force should not exceed 1000 kgf. When carrying and installing unpacked filters, it is permissible to grasp the filter only by the housing. When installing a filter into a filter cell from a room, it is allowed to support the filter by touching the filter bag only through a three-layer corrugated cardboard gasket.