Free calculator

Air Mover Calculator

Estimate how many air movers a room needs for a water-damage drying setup. Enter the room size, count the wet walls, and pick the class of loss — you'll get a transparent number you can sanity-check against the job.

This is a field rule-of-thumb estimate to start a drying plan, not a substitute for monitoring. Adjust based on materials, containment, and daily moisture readings.
Get the printable worksheet
Recommended
air movers
Affected floor area
From floor area
Wet walls
Closets / alcoves
Coverage assumed

Drying Equipment Worksheet

Fill this in on site and attach it to your file.

FieldValue
Job / claim # 
Room / area 
Air movers placed 
Dehumidifier(s) 
Class of loss 
Ambient temp / RH 
Day 1 readings 
Day 2 readings 
Day 3 readings 

How this calculator works

The estimate combines three things every drying tech weighs in their head — and makes them explicit so you can adjust:

  • Floor area airflow. One air mover per a coverage area of affected floor, where the coverage tightens as the class of loss rises (more water, faster airflow needed).
  • Wet walls. Add one air mover per wet wall to drive evaporation up vertical surfaces.
  • Closets & alcoves. Add one for each enclosed space that won't see airflow from the main room.

Coverage by class (assumptions)

ClassFloor coverage per air mover
Class 1~300 sq ft
Class 2~175 sq ft
Class 3~125 sq ft
Class 4~100 sq ft (specialty)

These are starting assumptions, not a standard. Real placement depends on materials, containment, equipment type, and — above all — your daily moisture readings. Treat the number as a sane starting point, then monitor and adjust.

Reference only. Vigilince makes no compliance claim — final equipment decisions are the professional's, verified on site.
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