Industrial Backward Inclined Fans & Blowers
Precision-engineered for efficiency, quiet operation, & 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.
Industrial Backward Inclined Fan Overview
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.
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.
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 and direct
AirPro designs and builds both standard and custom industrial fans with an unsurpassed level of quality and service. All of our products are also backed by our industry-leading 3-year warranty.
Backward Inclined Fan & Blower Types
BIHS
Backward-Inclined, High-Volume, Single-Width
High-volume backward inclined blower for clean or lightly contaminated, non-abrasive airstreams. Designed for lower static pressure applications, it delivers efficient airflow with temperatures up to 1,800°F, static efficiency up to 80%, and a non-overloading power curve.
BIMS
Backward-Inclined, Medium-Volume, Single-Width
Medium-volume backward inclined blower for clean or lightly contaminated, non-abrasive airstreams. Ideal for applications requiring less volume than the BIHS and less pressure than the BCMS, it offers temperatures up to 1,200°F, static efficiency up to 82%, and a non-overloading power curve.
BILS
Backward-Inclined, Low-Volume, Single-Width
Low-volume backward inclined blower for clean or lightly contaminated, non-abrasive airstreams. Ideal for applications requiring less volume than the BIMS and lower static pressures than the BCLS, it offers temperatures up to 1,200°F and static efficiency up to 78%.
BIHD
Backward-Inclined, High-Volume, Double-Width
High-volume backward inclined fan for clean or lightly contaminated, non-abrasive airstreams. Its double-width BIHS design increases airflow capacity, with temperatures up to 1,000°F, static efficiency up to 74%, and a non-overloading power curve.
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: BIHU (backward inclined, high-volume, un-housed)
- Application: Commercial HVAC
- Description: Size 270; Class 2; Arr. 4V; 1.8 HP; 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.
Applications
Common Industrial Backward Inclined Fan Applications
Dust Collection
Dust collection systems pull dust-laden air through a collector or baghouse. Backward inclined fans are a strong fit because they provide efficient, reliable induced draft airflow.
Dilution Air
Dilution air systems add clean air to reduce temperatures and contaminant concentrations. Backward inclined fans are a strong fit for efficient airflow in clean air applications.
Tempering Air
Tempering air systems control air temperature before it enters the process. Backward inclined fans are a strong fit for moving clean air efficiently.
