M1502.4.1 Material and size. Exhaust ducts shall have a smooth interior finish and be constructed of metal having a minimum thickness of 0.0157 inches (0.3950 mm) (No. 28gage).
(a) can I use metal spiral pipe (not sure if it meets the "smooth" definition) ? e.g.,: https://www.homedepot.com/p/Master-Flow-4-in-x-5-ft-26-Gauge-Spiral-Pipe-26SP4X60/205330690 (b) does it need to be 4" or can it be a larger diameter