The maximum amount of bending of the longest side for unstrengthened ducts is defined in DIN 4740 Part 5 for PVC and in DIN 4741 Part 5 for PPs.
Material
All ducts and fittings can be supplied in the following materials:
PPs, flame-resistant according to DIN 4102 B1
PE, specially stabilised for outdoor use
PVC, flame-resistant according to DIN 4102 B1
PP
Calculation
On the basis of the following date, COLASIT calculates and defines the optimum type of strengthening as required:
♦ max. edge length
♦ max. over-pressure and under-pressure in the ducting
♦ Temperature of medium passing through
♦ Permitted amount of bending
Types of strengthening
External strengthening using welded-on reinforcement profiles or internal stiffening using tubing.
Documents
The following documentation is available in PDF format: