This part of EN 13384 specifies methods for calculation of the thermal and fluid dynamic characteristics of chimneys serving more than one heating appliance.
This part of EN 13384 covers both the cases, either
a) where the chimney is connected with more than one connecting flue pipe from individual or several appliances in a multi-inlet arrangement; or
b) where the chimney is connected with an individual connecting flue pipe connecting more than one appliance in a cascade arrangement.
This part of EN 13384 deals with chimneys operating under negative pressure conditions (there can be positive pressure condition in the connecting flue pipe) and with chimneys operating under positive pressure conditions and is valid for chimneys serving heating appliances for liquid, gaseous and solid fuels.