Behavior under Fire

METU-FORM Air-ducts
Rectangular Connections
Round Connections
Access Doors
Assembly and Accessories

Fire behavior of building materials

KR = no smoke
KBA = no burning drops / dripping

DIN 4102-1	Requirements	KR	KBA

A1	non-flammable	x	x
A2	non-flammable	x	x
B1	flame retardent	x	x
B2	normally flammable		x
B3	easily flammable

About Flame Retardant Building Materials

Although a directive in Germany (MLüAR 2005) stipulates that only non-combustible materials must be used on air ducts, materials classified as "flame-retardant" are nevertheless permitted.

Information provided without guarantees

High Temperature Tests