DOAS Sizing Calculator

Space & Occupancy

Building Area (ft²)

Space Type

Diversity Factor (%)

OA per Person (CFM/person)

OA per Area (CFM/ft²)

Occupant Density (ft²/person)

Design Conditions

Outdoor DB — Summer (°F)

Outdoor WB — Summer (°F)

DOAS Supply Temp — Cooling (°F)

Outdoor DB — Winter (°F)

DOAS Supply Temp — Heating (°F)

Energy Recovery?

DOAS Sizing Results

Total OA CFM

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CFM

Design Occupants

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people

Cooling Coil — Total

—

tons

Cooling Coil — Sensible

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tons

Heating Coil

—

MBH

ERV Pre-Cooling Saved

—

tons

System Summary

Parameter	Without ERV	With ERV	Unit

Do the full calculation in AIM Works

This calculator handles one step. AIM Works runs the complete MEP design workflow — thermal load calculations, duct & pipe networks, equipment selection, code compliance, and an AI design assistant — in one tool.

✓ ASHRAE 62.1 ventilation + CLTD/CLF/RTS load methods

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