Industrial Backward Inclined Fans & Blowers

Precision-Engineered for Efficiency, Quiet Operation, and Long-Term Reliability

AirPro // Products

Highly Efficient Backward Inclined Industrial Fans

AirPro’s backward inclined (BI) fans and blowers are engineered for maximum efficiency and quiet operation in clean air and high-temperature environments. Featuring flat, backward-inclined blades, these fans reduce airflow interference, resulting in lower energy consumption and minimal sound levels. Their non-overloading horsepower design makes them ideal for low-pressure applications, helping you cut operating costs without sacrificing performance.

Whether you’re moving clean air in a production facility or managing high-temperature exhaust in a demanding environment, our backward inclined blowers deliver dependable airflow and long-lasting value.

Request a Quote

Backward Inclined Fan Description

Every backward inclined fan in our lineup is constructed by welding high-grade metals together to build a product fit to handle rugged, industrial environments. Our customers count on these fans to keep their operations running 24/7, and we deliver with craftsmanship that ensures reliability, efficiency, and airflow accuracy.

Backward Inclined Fan & Blower Types

BIHS

Backward-Inclined, High-Volume, Single-Width

The backward inclined blower moves high volumes of clean air at lower static pressures. It is available in belt-driven, direct-driven, and direct-coupled arrangements with varying impeller and housing widths.

BIMS

Backward-Inclined, Medium-Volume, Single-Width

Designed for medium air volume levels, the BIMS operates at its peak performance point with static efficiencies in excess of 80%. This product is ideally suited for clean air applications demanding less volume than the BIHS is ideally suited for, and less pressure than the BCMS is ideally suited for.

BILS

Backward-Inclined, Low-Volume, Single-Width

Designed as a narrower wheel offering in a backward inclined profile, the BILS moves lower air volumes than the BIMS at lower static pressures than the BCLS. Its rugged construction lends itself to simpler manufacturing and thus a nice option to consider when the application case fits it well.

BIHD

Backward-Inclined, High-Volume, Double-Width

This backward inclined fan model is similar to the BIHS except that the impeller and housing are double the width. This gives the BIHD a higher air flow capacity.

Industrial Backward Inclined Fan Performance & Design

Volume: up to 500,000 cfm
Pressure: up to 60”wg
Temperature: up to 1800°F
Static Efficiency: up to 82%
Drive: Belt & Direct

Choosing the ideal model depends on your system’s required air volume, static pressure, gas temperature, and whether the airflow is clean or particulate-laden. AirPro’s experienced application engineers will review your specifications and help you select the optimal fan solution to ensure reliable, efficient performance in your specific operating environment.

Get In Touch

FEATURED FAN

Un-Housed Blower for High Volumes of Clean Air

AirPro designed this backward inclined, high-volume, un-housed fan (BIHU) for a commercial HVAC application requiring high volumes of clean air at lower static pressures. We developed this type of backward inclined fan with a focus on high efficiency without compromising mechanical strength.

This fan features a welded carbon steel un-housed wheel with a piezometer ring installed in the spun inlet cone. Credit to our design team for creating a very functional, application-specific fan for the customer’s needs.

Product Type: BIHV/BIHU
Application: Commercial HVAC
Description: Class 2, Arr. 4 V, 1.8hp, 150ºF max temp design
Performance: 14,000 CFM @ 30″ wg static pressure

How the Backward Inclined Fan Works

Backward inclined high-volume fans operate similarly to backward curved designs. Air enters through the center of the wheel, hits the hub, and exits along the blades. The flat blade configuration and gradual leading edge reduces friction quickly and improves construction efficiency, resulting in an economical and high-performing product line.

For high-volume, low-pressure applications, fan selection depends heavily on airflow needs. Double-width blade models boost capacity without increasing wheel diameter and are compatible with belt drive, direct drive, or direct-coupled setups—making them a reliable choice for efficient industrial air movement.