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Your specific task is calculate duct diameter from cfm and air velocity. Open the page, drop your input, get the result — typically under a second.
Your goal is calculate air velocity in a duct from cfm and duct dimensions. Same approach: paste in, get the result, move on. No account, no upload.
Both tools live in the same category, so the choice depends on the exact subtask. Duct Size focuses on calculate duct diameter from cfm and air velocity; Duct Vel focuses on calculate air velocity in a duct from cfm and duct dimensions. Try whichever description matches your goal more closely — they're both free.
Yes — both tools are free for unlimited personal use. The Pro plan unlocks higher limits and batch features but the core functionality stays free forever.
Absolutely. Many users chain multiple tools together — process a file with one, then feed the result into another. Nothing is uploaded, so chaining is essentially instant.
No. Both Duct Size and Duct Vel work without signup. We only ask for an email if you decide to subscribe to a paid plan.