How to Size a Smoke-Exhaust Fan and Fire Damper Package for Underground Parking
A practical selection guide for underground parking garage ventilation: zone airflow, damper actuator signals, ceiling-height duct routing and noise limits.
An underground parking garage is judged twice: every day as a ventilation space, and within minutes as a smoke-exhaust system in a fire. Getting the fan and damper package right before ordering is what lets both roles pass - and what keeps the package inside a low ceiling with shared shafts and structural beams.
Start from zones, not from the building
Fire inspection is passed zone by zone, so airflow and pressure must be confirmed per zone. A fan sized on a whole-building average will leave individual zones short when the dampers close off adjacent areas.
- Confirm required airflow and static pressure for each smoke zone, including make-up air.
- Place smoke exhaust fans and mixed-flow fans for main extraction and make-up air paths.
- Add jet fans where induction is needed to move smoke toward extraction points.
Match the fire damper to the alarm interface
A fire damper is only as good as its actuator and control signal. Confirm actuator type, voltage and signal against the fire alarm interface before ordering, and schedule smoke exhaust fire dampers at every zone and shaft boundary so the sequence is unambiguous on site.
Route ducts against the real ceiling, including beams
Duct sizes must be checked against available ceiling height at every beam crossing, not against a nominal clear height. Where shafts pass beneath residential or office floors, add silencers so boundary noise stays within limits during daily operation.
What to send for a checked selection
Send the ventilation drawings, zone schedule and alarm interface details. A supplier that reviews airflow per zone, damper signals and beam crossings together will return a package that passes inspection the first time. See the underground parking garages application for the typical equipment package, or review smoke exhaust fans and fire dampers in the catalogue.
Send the list and the application. The first response should help you decide what needs to be confirmed next.
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