Specifications of the exhaust fan in the distribution box

Exhaust fans for distribution boxes are typically centrifugal or EC motor-driven box fans with capacities ranging from a few hundred to over 28,000 CFM, designed for indoor/outdoor installation, variable speed control, and high-temperature tolerance.

Key Specifications

1. Fan Type and Design

• BEFx Box Fan: Multi-use, variable-volume centrifugal fan suitable for indoor/outdoor installation, including bathroom, kitchen, or dryer exhaust. Features a scroll-free housing with inlet and outlet on the same centerline to minimize lint build-up and double-wall insulation for fire, noise, condensation, and heat protection .
• BESB Box Fan: Low-energy fan with backward-curved B-wheels and sound-dampening insulation, available in seven sizes with nine capacities. EC motor-equipped for efficient operation .
• BESF Box Fan: Compact fan with forward-curved F impeller, sound-damping insulation, and optional EC motor for fast flow changes . 2. Airflow Capacity
• BEFx fans: Over 6,000 CFM, up to 28,000 CFM, AMCA FEI certified .
• BESB and BESF fans: Capacities vary by size, suitable for low to medium airflow applications, with measurement points for airflow verification . 3. Motor and Control
• BEFx: Includes EDrive E3 Motor Controller (NEMA 4X) for indoor/outdoor use, allowing precise speed adjustment .
• BESB/BESF: Equipped with EC motors for energy efficiency and low noise, with optional speed control for variable airflow . 4. Temperature and Environmental Ratings
• BEFx: UL 705 standard for power ventilators, suitable for venting lint-laden air .
• BESB: Normal operation up to 80°C; outdoor versions can handle hot air up to 200°C .
• BESF: Normal operation up to 60°C . 5. Installation Options
• Fans can be curb-mounted, inline, suspended, or standing on a flat surface. Multi-position hinged doors allow easy access for maintenance .
• BESB/BESF fans are suitable for indoor or outdoor mounting depending on the model, with condensate drains included or optional . 6. Noise and Certification
• All models feature sound-dampening insulation. BEFx and BESB fans comply with AMCA standards for sound and air performance .
• BEFx is the only variable-volume AMCA FEI certified centrifugal fan with high airflow capacity . 7. Additional Features
• Safety screens, removable bushings, and dynamically balanced fan sheaves are standard for larger fans (10,000 CFM and above) to ensure reliable operation .
• Fans may include provisions for wall or plenum mounting and are compatible with electronic actuators for adjustable airflow . These specifications ensure that exhaust fans in distribution boxes provide efficient ventilation, temperature tolerance, low noise, and easy maintenance, making them suitable for industrial, commercial, and residential applications.