CAT CLASS: HQ-10463

1,000-2,000 cfm Confined Space Ventilator

The 1,000-2,000 cfm confined space ventilator class represents the standard-duty tier for vessel and tank entry operations, rated for 25 to 50 feet of attached ducting. These units bridge the gap between light-duty portable blowers and high-capacity industrial ventilation systems, handling typical permit-required confined space environments. The size class sits in the middle of the confined space ventilator ladder, with units delivering 1,200 to 1,970 cfm airflow.

Models

Brands

Cat classes

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

Key specifications

Specification	Typical range	What it means
Airflow	1,200–1,970 cfm	Rated delivery with duct resistance factored into performance curves
Duct Length Capacity	25–50 ft (7.6–15.2 m)	Maximum effective duct run before airflow degrades below acceptable ventilation rates
Application Zone	Standard vessels and tanks	Sized for entry work in typical industrial confined spaces

How to choose

This size class suits standard vessel entry, tank cleaning, and moderate-depth confined space work where 25 to 50 feet of ducting connects the blower to the entry point. When duct runs exceed 50 feet, when ventilating larger vessels above 10 feet in diameter, or when air change rates demand higher volumes, the 2,000+ cfm Confined Space Ventilator delivers the necessary airflow with less performance loss. For shallow manholes, utility vaults, or short-duct applications where portability is prioritized, the Up to 1,000 cfm Confined Space Ventilator offers sufficient ventilation with easier handling.

What this size handles

Entry and purging of horizontal storage tanks 6 to 10 feet in diameter
Ventilation of process vessels during maintenance turnarounds
Fume extraction from coating or cleaning operations inside tanks
Air supply for welding or grinding work in confined vessels
Continuous ventilation during multi-worker entry in vertical silos
Solvent vapor control in paint booths and confined coating areas

Safety & operation

Air monitoring must confirm acceptable atmosphere before and during ventilation; blowers do not substitute for gas detection
Duct connections require secure attachment to prevent disconnection during operation and loss of ventilation
Blower placement must remain outside the confined space to avoid introducing exhaust or recirculating contaminated air
Static bonding and grounding apply when ventilating spaces with flammable vapor hazards

Transport & logistics

Most units in this class are hand-portable by two workers or moved on hand trucks
Typical weight and footprint allow transport in pickup beds or van cargo areas without special securing

Power & supply

Electric models typically draw 115V single-phase, compatible with standard job-site circuits
Higher-output units may require 230V single-phase or dedicated 20A circuits to avoid breaker trips

Frequently asked

How does duct length affect airflow in this size class?

Airflow degrades with friction loss as duct length increases. Units rated for 25 to 50 feet of ducting maintain sufficient air changes within that range, but performance drops significantly beyond the rated duct length, often requiring a step up to the 2,000+ cfm Confined Space Ventilator class.

What differentiates this class from smaller confined space blowers?

The 1,000-2,000 cfm class handles longer duct runs and larger vessel volumes than the Up to 1,000 cfm Confined Space Ventilator, which is optimized for short-duct, shallow-entry applications where portability outweighs airflow demand.

Can this size class provide both supply and exhaust ventilation?

Most models in this class are configured for either supply (positive pressure) or exhaust (negative pressure) operation. Supply mode forces fresh air into the space, while exhaust mode pulls contaminated air out; the choice depends on the specific confined space hazard and entry protocol.