* Pressure ratings for filament wound duct are based on a strain of .001 in./in.
* Vacuum ratings are based on a 5 to 1 safety factor.
* Thicknesses shown are recommended minimums. Systems should be designed for actual operating conditions.
* Ershigs’ FRP duct can be provided with contact molded or filament wound construction.
* Thicknesses shown include a 100 mil structural | corrosion liner.
* Pressure ratings for contact molded duct are based on a 10 to 1 safety factor.