kyhowey
Silver Member
Builder with a slab-on-grade floor. Someone decided to run 4" PVC under the slab for the dryer vent. HVAC inspector called me to see what I thought. Code says it must be constructed with "rigid metal duct, having smooth interior with joints running in the direction of air flow."
What do you think of PVC since it's under a concrete slab? As I type this, it looks like the HVAC inspector will let it go this time with a "don't do it again" warning. He is going to require a window well on the exterior to maintain clearance from the finished grade.
What do you think of PVC since it's under a concrete slab? As I type this, it looks like the HVAC inspector will let it go this time with a "don't do it again" warning. He is going to require a window well on the exterior to maintain clearance from the finished grade.