Convention Applied by the app hvac.room.airflow-defaults
Room airflow by type
The cubic feet per minute per square foot the app assumes for a room type when no target is given — office 1.0, conference and break 1.5, storage 0.5.
| When | The app uses |
|---|---|
| office | 1 cfm/ft² |
| conference | 1.5 cfm/ft² |
| break room | 1.5 cfm/ft² |
| storage | 0.5 cfm/ft² |
- Source
- trade practice · light-commercial supply-air rule of thumb
- Editions checked
- —
- Used by
- Room Sizer Duct Schedule
- Amendments
No state or local amendment to this rule is on file. Not on file means the model code as written — check your jurisdiction.
A working figure the trade uses and the app defaults to. Shops override these most.
When a Room Sizer room has a type but no airflow, the app needs a starting target to balance a system against. These are the rules of thumb a design-build estimator uses to check a plan before an engineer's schedule exists: about one CFM per square foot for an office, more for a full conference or break room, less for storage.
What the app does with it
A room's target airflow is its floor area times this rate unless you give the room its own; the air-balance badges compare the diffusers you counted in the room against that target. A room type of custom carries no rate.
What it does not do
This is supply air for sizing, not outdoor-air ventilation. ASHRAE 62.1 rates are per occupant plus per area and belong to the engineer.
Cited by section, not reprinted: the code text belongs to its publisher. Company practice is not a rule here — it lives with your pricing.