分类	分级	厚度（mm）	抗张强度（kN/m)		挺度（mN.m）	过滤效率（%）a	过滤阻力（Pa）a
			MD	CD
ASHRAE	F6	0.32-0.35	1.2	0.5	≥1.5	≥15	≤15
	F7					≥45	≤35
	F8					≥60	≤60
	F9					≥80	≤90
HEPA	NK-H-95 W (H10W)	0.32-0.35	1.2	0.5	≥1.2	≥95	≤160
	NK-H-29W (H11W)					≥99	≤200
	NK-H-295W (H12W)	0.3-0.33				≥99.5	≤260
	NK-H-39W					≥99.9	≤300
	NK-H-395W					≥99.95	≤320
	NK-H-397 W (H13W)					≥99.97	≤360
	NK-H-49W					≥99.99	≤380
ULPA	NK-U-495W (H14W)	0.3-0.33	1.2	0.5	≥1.2	≥99.995	≤400
	NK-U-59W					99.999	≤450
	NK-U-69W					99.9999	≤560

分类	分级	厚度（mm）	抗张强度（kN/m)		过滤效率（%）b	过滤阻力（Pa）b
			MD	CD
HEPA	NK-H-95Y (H10Y)	0.32-0.35	0.3	0.15	≥90	≤130
	NK-H-29Y (H11Y)				≥98	≤180
	NK-H-295Y (H12Y)	0.3-0.33			≥99.2	≤200
	NK-H-39Y				≥99.8	≤260
	NK-H-395Y				≥99.92	≤340
	NK-H-397Y (H13Y)				≥99.96	≤350
	NK-H-49Y				≥99.98	≤365
ULPA	NK-U-495 Y (H14Y)	0.3-0.33	0.3	0.15	≥99.99	≤380
	NK-U-59Y				99.992	≤400