33
7.3.3 Material and installation
Flue gas discharge:
Rigid single walled: stainless steel (316), aluminium or plastic (to comply with building
regulations).
Flexible: stainless steel (316).
Construction: all joints and seams should be gastight and watertight with the horizontal
runs graded towards the boiler to allow condensate free drainage to the boiler.
Horizontal lenghts in excess of 4M should incorporate a condensate drain.
The flue outlet should terminate with reduction cone and bird guard only (chinamans
hat or GLC type terminals etc. should not be used). Use vertical flue terminal
MG 87973 for classification C33 and use horizontal flue terminal MG 87996 for
classification C13. Flue material for classification C6 must comply EN 483 annex N
and must always be in draft condition.
Air supply:
Single walled, rigid or flexible: aluminium, stainless steel and plastic (to comply with
building regulations).
7.3.4 Single boiler conventional flue
Fig. 07
Flue gas discharge duct without bends, single boiler, conventional flue.
04.W4H.79.00002
