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Rules of stiffening the ventilation ducts with the standard quality::

Side dimension (mm)	Sheet thickness (mm)	Sheet thickness (mm)
	Class N	Class S
100 - 500	0,60	0,70
501 - 1000	0,80	0,90
1001 - 2000	1,00	1,10
2001 - 4000	1,10	1,20

A [mm]	B [mm]	L [mm]	Liczba st [szt]
∞	∞	<1000	0
>=1000	>=1500	1000÷1499	1
>=800	>=600	1500÷1999	1
>=800	>=800	1500÷1999	1+
>=300	>=1250	1500÷1999	1
>=800	>=300	>=2000	1
>=800	>=500	>=2000	1+
>=2000	>=250	>=1500	2

+ (cross bracing)

Remark: duct's length module - 1500 mm.

Rules of using the rims in the ventilation ducts and fittings with the standard quality:

Size of the rim depending on the side length [m]
Side length [mm]	<=1000	>1000	>2500
Size of the rim	P20	P30	P40

Pressure stages for the ducts according to DIN 24 190/24 191:

Pressure stage	1	2	4	5
Admissible pressure	1000	25000	-630	-1000

Depth of the ducts' walls according to DIN 24 190/24 191:

Sides' length	Pressure stage
	1 and 4	2 and 5
100-530	0,6	0,7
531-1000	0,8	0,9
1001-2000	1,0	1,1
2001-4000	1,1	1,2

Class tightness to DIN 24 194:

Class tightness	System kanałowy	Leakiness indicator [f] with the pressure difference [ΔP]
		200 Pa	400 Pa	1000 Pa
I	without any requirements
II	higher requirements	0,84*10E-3	1,32*10E-3	2,4*10E-3
III	the highest requirements	0,28*10E-3	0,44*10E-3	0,8*10E-3

Class tightness to PN-B-76001:1996:

Class tightness	System kanałowy	Leakiness indicator [f] with the pressure difference [ΔP]
		200 Pa	400 Pa	1000 Pa
A	without any requirements	0,84*10E-3	1,32*10E-3	2,4*10E-3
B	higher requirements	0,28*10E-3	0,44*10E-3	0,8*10E-3

[f] - ducts' leakiness indicator [m3/s*m2],
[ΔP] - the difference between the pressure inside the duct and the environment [Pa].