Air-mover & dehumidifier sizing typicals

Structural drying uses two machines: air movers to evaporate water off surfaces and LGR dehumidifiers to pull it out of the air. A common rule of thumb is about one air mover per 50–70 sq ft and one LGR dehumidifier per ~500 sq ft at Class 2. These are labeled IICRC/AHAM planning typicals — the water class, materials and airflow change the real count. Use them in the drying-equipment tool.

Affected areaAir movers (~60 sq ft each)LGR dehumidifiers (~500 sq ft each)
200 sq ft4 units1 unit
500 sq ft9 units1 unit
1,000 sq ft17 units2 units
2,000 sq ft34 units4 units

Air movers = ceil(area ÷ coverage); dehumidifiers = ceil(area ÷ LGR coverage). Labeled IICRC/AHAM planning typicals — the water class, materials and airflow change the real count; a certified technician confirms the plan.

Related calculators

Structural Drying EquipmentSize structural drying: how many air movers and LGR dehumidifiers to dry a room from the affected square footage, using labeled IICRC/AHAM coverage typicals.Air Scrubber & Negative-Air CFMSize negative-air scrubbers by required CFM from room volume and your ACH target — the ACH formula, a worked example and an air-quality FAQ, no lead-gen.