New standards in manufacturing the entrance doors

Starting July 1st, 2016 Republic of Belarus will implement new requirements to the production of entrance doors — STB 2433-2015 “Door blocks. General technical conditions”. This standard applies to hinged door units, which are designed to be installed in the openings in external and internal walls of the buildings.

Thermal resistance

According to the new standards of heat resistance exterior door units in heated buildings are divided into three classes:

Class of thermal resistance
Т1 Т2 Т3
Thermal resistance, m2·°С/W
1,0 and more
from 0,60 to 0,99 
from 0,35 to 0,59 

Waterproof and air permeability

Air permeability and waterproof of the entrance door blocks in heated buildings, as well as the entrance to the apartments and interior door frames are divided into five classes.

Class of air permeability and waterproofing
Air permeability, m3/(h·m2), при Р = 100 Pа
Limit to waterproofing, Pа
А 3 600
B 9 500
C 17 400
D 27 300
F 50 150

Sound insulation

Sound insulation of interior and exterior door units in the apartments are divided into the following four categories. Please note, door units with less than 25 dB sound insulation have no classification.

Category of sound insulation А В С D
Index of sound insulation in dB   36 — 34       33 — 31       30 — 28       27 — 25    

Resistance to wind blowing load

Resistance to wind blowing load on exterior door frames are divided into classes according to the following table:

Class on resistance to wind blowing loads Possible flexing of the door block Difference in pressure, Pа
А1
А2
А3
1/300
1/200
1/150
from 1000 and more
B1
B2
B3
1/300
1/200
1/150
from 800 to 999 
C1
C2
C3
1/300
1/200
1/150
from 600 to 799 
D1
D2
D3
1/300
1/200
1/150
from 400 to 599
E1
E2
E3
1/300
1/200
1/150
from 200 to 399

Durability class

All doors classify according to its resistance to mechanical loads.

Name of the indicator Indicators of durability class
1 2 3 4
Resistance to static vertical loads applied on the door surface, Н 400 600 800 1000
Resistance to static twisting, Н 200 250 300 350
Resistance to hitting of soft heavy object, J 30 60 120 180
Resistance to hitting of solid object, J 1,5 3,0 5,0 8,0

According to STB 2433-2015 standards “Door blocks. General technical conditions” all doors produced by Steel Line meet requirements of the 4th highest class of durability.

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