HVAC Duct Tools Manual D

HVAC Duct Tools — Manual D duct sizing and field checks, built for the trade.

Whether you're sizing a duct at the truck or making a fast call in an attic, HVAC Duct Tools gives you defensible numbers in seconds — no account, no tracking, nothing to configure.

FREE FIELD TOOLS • Quick Size — enter CFM and get the duct size, round or rectangular, with velocity and the governing constraint. The ductulator, in your pocket. • Duct Check — enter an existing duct (round or rectangular), airflow, and role to read back its friction rate and velocity, with a clear undersized / adequate / oversized verdict at the as-built size. • Static Pressure Check — enter supply and return static plus your equipment's rated max to get total external static pressure (TESP), a clear over / within / under verdict, and which side dominates.

BUILT HONEST • Every result shows what it assumes, so you can sharpen it. • Plausibility checks flag implausible inputs as "check your inputs," never a confident wrong answer. • Stocked round sizes and role-based velocity limits reflect real-world practice.

PRIVATE BY DESIGN • Works fully offline. No sign-in, no cloud, no analytics — nothing you enter leaves your phone.

HVAC Duct Tools is a field estimator based on ACCA Manual D methods. It is a professional aid, not a substitute for a stamped Manual D design or measured commissioning."