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IMC + NFPA coordinationListed design required

Kitchen Hood Design
Coordination Worksheet

Compare scheduled exhaust airflow with the requirement already established by the hood design, then record whether listing and suppression documents are coordinated.

Who it's for: mechanical engineers and contractors reconciling kitchen hood exhaust airflow at construction documents.

Documented design comparison
scheduled airflow ÷ verified requirement

How to use this calculator

1
Complete the hood and suppression design
Use the adopted code, appliance information, hood listing, manufacturer documents, and suppression-system listing.
2
Enter the verified airflow
Use the requirement for the exact hood, configuration, duty, appliances, and installation.
3
Enter the scheduled airflow
Use the coordinated mechanical schedule value on the current documents.
4
Resolve document gaps
An unresolved listing or suppression status must remain unresolved; this worksheet does not decide it.

The formula

Airflow ratio = scheduled exhaust airflow ÷ verified required exhaust airflow.
Difference = scheduled − required.
No hood type, airflow, makeup air, duct, or suppression-system size is calculated.

Worked example

Example
A listed hood design requires 2,400 CFM and the mechanical schedule shows 2,500 CFM. The arithmetic ratio is 1.042 and the difference is +100 CFM. This does not validate capture and containment or system compliance.

When this estimate will be off

  • Does not classify cooking effluent, select Type I or Type II, determine whether a hood or suppression system is required, or establish exceptions.
  • Does not size exhaust, makeup air, ducts, fans, grease removal, clearances, controls, fuel/power interlocks, extinguishing agent, piping, or nozzles.
  • Does not validate the hood or suppression-system listing, appliance arrangement, capture and containment, commissioning, inspection, or maintenance.
  • A scheduled airflow no lower than an entered requirement is only a document comparison, not code or performance approval.

Frequently asked questions

A common mistake: Does not classify cooking effluent, select Type I or Type II, determine whether a hood or suppression system is required, or establish exceptions.

No. Enter the designation already established for the exact appliances, effluent, hood, listing, adopted code, and authority interpretation.

No. Listed-system design, appliance/nozzle coverage, agent, piping, controls, and installation must follow the applicable listing and qualified design documents.

The result remains explicitly unresolved even if scheduled airflow is numerically no lower than the entered requirement.

Sources

This free Kitchen Hood Airflow Checker is built and maintained by DataDrivenAEC, using the relevant codes and standards. It does not substitute for professional judgment.