Question: What about flex PVC pipe?
Why is flex pipe pipe recommended inside the attic?
Cementing pvc pipe and pipe joints together can be very toxic. This is especially true inside the attic which tends to be a very closed area without adequate ventilation. IF flexible two inch pvc pipe is used, there is no need for cementing pvc pipe inside the attic. This is because a continuous length of pipe can be used inside the attic and joined to rigid pvc pipe outside the attic.