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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📏 Master your airflow with precision and ease!

DURABLE PLASTIC BUILD - Sturdy yet lightweight material built to withstand daily wear.
EFFORTLESS PORTABILITY - Slim, lightweight design fits easily in your toolkit or pocket.
TRUSTED INDUSTRY STANDARD - Redesigned by Trane in 2016 for modern HVAC pros.
BATTERY POWERED EFFICIENCY - Reliable power source ensures consistent use on the job site.
PRECISION AT YOUR FINGERTIPS - Accurately calculate duct sizes for flawless HVAC performance.

The Trane Ductulator TD1 is a compact, battery-powered duct sizing calculator redesigned in 2016 to deliver precise HVAC duct measurements. Crafted from durable plastic and weighing just 86 grams, it offers portability and reliability for professional use.

RM406

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Product Dimensions	26.04 x 22.23 x 0.33 cm; 86.18 g
Part number	TD1
Material type	Plastic
Power source type	Battery Powered
Manufacturer	Trane
Item model number	TD1
ASIN	B01BUGXB7G

TraneDuctulator , Redesigned for 2016 by Trane

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