Start with target CFM and duct size, then capture straight length, elbows, transitions, grilles, filters, and termination.
Duct fan pressure intake tool
Duct Fan Static Pressure Estimator
Collect duct route, airflow, fittings, filters, and restriction notes before inline or cabinet fan review.
CFM airflow target Duct size and length Elbow fitting count Curve fan curve
Calculator Steps
Input Workflow
The estimator should collect the installed resistance story before anyone compares fan families.
Equivalent review length is only a review aid for pressure class.
Low-restriction paths fit inline fan review; higher-restriction paths fit cabinet or higher-pressure review.
Keep sound target, service access, controls, and mounting location attached to the review.
Tie fan curves, airflow, pressure, sound, electrical, and certification data to the selected model.
Result Notes
Calculation Output
A duct note can point the equipment family, but final static pressure requires project-specific duct calculation and product fan curve review.
Equivalent path
Length, elbows, filters, grilles, and termination explain why delivered airflow may differ.
Map the full route.Pressure class
Restrictive paths may shift review from inline fan to cabinet or higher-pressure fan families.
CFM and pressure before diameter.Sound and access
Fan location, service access, and sound target can change the practical equipment family.
Attach installation notes.Fan curve
Final airflow at static pressure needs the exact product fan curve.
Review fan curve.Duct matrix
Duct Pressure Matrix
| Duct condition | Project facts | Equipment family | Review note |
|---|---|---|---|
| Short simple run | CFM, duct size, length, termination | Inline duct fans | Still confirm airflow |
| Long or elbow-heavy run | Equivalent path, elbows, transitions, access | Inline or cabinet fan review | Static pressure can dominate |
| Filter or grille restriction | Filter type, grille, service access, replacement plan | Cabinet or fan-filter review | Restriction changes delivered airflow |
| Quiet occupied area | Fan location, duct route, sound target | Inline, cabinet, or remote mounting review | Installed sound differs from catalog sound |
Product Match
Equipment Families
Duct pressure output should keep inline, cabinet, or higher-pressure fan review tied to CFM, duct path, restriction, sound, and service notes.
Related Pages
Applications and Guides
Applications
Charts and references
FAQs
Technical FAQs
Why is this an estimator?
Pressure loss depends on exact duct, fittings, filters, and installation details, so the estimator prepares a review rather than certifying a number.
Which inputs create the biggest pressure changes?
Long duct runs, tight elbows, filters, grilles, dampers, and small terminations usually drive pressure higher.
How should the result be used with fan selection?
Use it to identify whether inline, cabinet, or utility fan review is appropriate before checking model fan-curve data.