Rigid instead of flex duct before EF5 filter stack

Ed W

New member
Has anyone replaced the flex duct that connects the filter stack on the EF5 to the outlet with an 8” Nordfab elbow? Seems like it would help reduce the back pressure from the impeller.


I don't have one but suspect the flex is there to allow more location/positioning options for the filters. With a rigid elbow the filters would need to be supported in the right spot to attach it without stresses on any parts. The hose allows for less precise positioning. In short it is easier to work with. You are right in that a smooth elbow would reduce the back pressure.