CAT CLASS: HQ-10469

24-42 in High-Velocity Drum Fan

The 24-42 in high-velocity drum fan size class covers units with fan diameters from 24 to 36 inches, designed to move air across rooms, bays, and shop floors. These mid-range drum fans deliver airflow from approximately 15 to 3,850 cfm, bridging the gap between smaller portable units and large industrial models. This class represents the most common size for general-purpose ventilation in commercial and light industrial settings.

Models

Brands

Cat classes

Pick a size class — capacity and reach differ across the range.

Key specifications

Specification	Typical range	What it means
Fan Diameter	24–36 in (61.0–91.4 cm)	Diameter of the drum opening; determines airflow capacity and throw distance.
Airflow	15–3,850 cfm	Cubic feet per minute of air moved; varies by motor speed and blade design.
Available Brands	Schaefer, Pinnacle Climate Technologies, Master	Manufacturers represented in this size class across the rental industry.

How to choose

The 24-42 in class is appropriate for moving air through open shop floors, warehouse bays, drying multi-room areas, or ventilating medium-sized enclosed spaces. When the work area is confined to a single small room or workstation, the Up to 24 in High-Velocity Drum Fan offers easier handling and placement. For large open warehouses, manufacturing floors, or applications requiring sustained airflow across distances exceeding 50 feet, the 42+ in High-Velocity Drum Fan provides the necessary throw and volume.

What this size handles

Ventilating a two-bay automotive shop during paint or coating work
Drying floors and walls in a 2,000–5,000 sq ft commercial space after water damage
Circulating air across a warehouse receiving area or staging floor
Cooling workers in an open fabrication shop or assembly bay
Exhausting fumes or dust from a medium-sized workshop with open doors
Providing airflow in a greenhouse or agricultural building

Safety & operation

Position fans to prevent tipping; secure on level surfaces and away from foot traffic
Maintain clearance around intake and discharge openings to prevent airflow restriction and motor overheating
Verify that electrical circuits can handle the motor load, especially when operating multiple units
Guard grilles prevent contact with blades but do not eliminate entanglement hazards with loose materials or clothing

Transport & logistics

Units in this class typically weigh 40–120 lbs and move by hand truck or two-person carry
Standard pickup trucks and cargo vans accommodate one or more units; no dedicated trailer required
Drum fans in this range fit through standard doorways and service entrances

Power & supply

Most models in this class operate on 120V single-phase power via standard 15A or 20A circuits
Larger 36 in units may require 240V power or dedicated circuits; confirm amperage draw before deployment
Corded electric operation with power cords typically 10–25 ft in length

Frequently asked

What differentiates a 24 in model from a 36 in model in this class?

Fan diameter directly affects airflow volume and throw distance. A 36 in model moves significantly more air and projects it farther than a 24 in unit, but also weighs more and may require higher amperage.

Can units in this class be used outdoors?

Many models are rated for outdoor use in dry conditions, but exposure to rain or standing water poses electrical hazards. Verify the unit's ingress protection rating and keep electrical connections dry.

How does airflow in cfm relate to cooling or drying performance?

Higher cfm increases air movement speed and evaporation rate. Effective drying or cooling also depends on placement, humidity, and air exchange with the outside environment.