
Appendix 1
Table 1: Relations between restriction, discharge system construction and type of gas
Type
Type of gas
Number of
tube length
Restriction
Remarks
90º bends
(meter)
(mm)
7kW
G20/G31
0
0
22,5
Direct connection to wall-terminal
0
1-10
22,5
1
1-10
22,5
Restriction is a fixed part
2
1-10
22,5
of venturi tube
3
1-6
22,5
4
1-2
22,5
12kW
G20
0
0
36
Direct connection to wall-terminal
0
1-10
none
1
1-10
none
2
1-10
none
3
1-6
none
4
1-2
none
G31
0
0
45
Direct connection to wall-terminal
0
1-10
none
1
1-10
none
2
1-10
none
3
1-6
none
4
1-2
none
16kW
G20/G31
0
0
45
Direct connection to wall-terminal
0
1-3
none
1
1-3
none
4
APPENDIX 1