Is "round duct" flex duct or rigid spiral duct?

This calculator is for rigid duct only, so the proper answer is rigid.

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Manufacturer	Trane
Country of Origin	USA
Item model number	TD1
Product Dimensions	26.04 x 22.23 x 0.33 cm; 86.18 g
ASIN	B01BUGXB7G

Trane TD1 Ductulator with Sleeve, Duct Sizing Calculator

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