Product designation according to
UNI EN 1856-2: 2009

Steel single wall with FKM seal.
Temperature	Pressure	Condensate	Corrosion	Flue liner material specification	Sootfire	Minimum distance to combustible material
T250 max 250 °C	P1 200 Pa	W Wet utilization	Vm Corrosion class	L01120 Normal steel S 235 JRG 2	0 No resistance (with seal)	100 100 mm
T250 max 250 °C	N1 40 Pa	D Dry utilization	Vm Corrosion class	L01120 Normal steel S 235 JRG 2	G Resistant (without seal)	500M 500 mm