Rolflex makes folding doors for industrial usage. For some applications the doors may be placed in a potentially explosive environment.
It is always the responsibility of the user to state which zone in compliance with ATEX 153 the door is going to be used, where these zones are located and which temperature class is necessary, and on this basis to determine whether the Compact folding door meets requirements.
The marking of the standard is structured as follows:
First Material group I or II , then Atex Category 1, 2 or 3, then the explosion protection code. Finally the temperature class is given, ranging from T1 to T6.
Directive 2014/34/EU (ATEX 114 Directive)
Directive 2014/34/EU reference: II 3 GD T6
This classification indicates:
o II: other explosive conditions than mining (mining is “I”)
o 3: stands for Category 3 (Zone 2 Gas, Zone 22 Dust)
o G: stands for Gas
o D: stands for Dust
o T6: stands for the temperature class
The mechanical elements of the door are therefore suited to a situation where an explosive gas or dust may occur in accordance with Zone 2 / 22 whereby that gas or dust must have a fire point that is higher than 85°C (T6).
In order to make the folding door suitable for placing in a potentially explosive environment a number of adjustments are made:
There are a few aspects that also must be taken account of:
For parts of the motor and electrical installation it depends which parts are in the ATEX zone. The temperature class of these components may naturally change the temperature class of the whole. For instance, if the drive is T4 then that will be the determinative temperature class for the door as a whole.