Broan attic fans are engineered to address common residential ventilation challenges by mitigating heat and moisture accumulation in attics and garages. These systems are critical for maintaining energy efficiency, structural integrity, and indoor air quality in U.S. homes. Based on the installation instructions, technical specifications, and maintenance protocols detailed in official Broan documentation, this article provides a comprehensive guide for the proper installation, configuration, and ongoing care of Broan attic ventilation fans, particularly the FIN-180B Basic Supply Fan and the 356BK Powered Attic Ventilation Fan models.
Understanding the correct installation practices, safety requirements, and maintenance schedules is essential to ensure optimal performance and longevity of Broan attic fans. This guide is structured to provide step-by-step instructions, key technical considerations, and actionable insights drawn directly from manufacturer documentation.
Overview of Broan Attic Ventilation Systems
Broan offers two primary attic ventilation fan models in the context of this guide: the FIN-180B Basic Supply Fan and the 356BK Powered Attic and Garage Ventilation Fan. Both models are designed for residential use, with distinct capabilities and installation requirements.
The FIN-180B is a supply fan intended for indoor air distribution and is part of a balanced ventilation system. It is used in conjunction with an air handler unit (AHU) and supports both low and high airflow ranges (30–180 CFM). It is suitable for homes where continuous indoor air quality is a concern, particularly in colder climates.
The 356BK is a roof-mounted powered attic ventilation fan designed to remove hot air and moisture from attic spaces. With a 1600 CFM capacity and a precision-balanced 14-inch metal blade, it is ideal for cooling attics during summer and reducing humidity in winter. The 356BK also features an adjustable thermostat and a built-in birdscreen to prevent animal and insect intrusion.
Both models are subject to specific installation and maintenance requirements to ensure safe and efficient operation. The following sections provide detailed instructions for installation, configuration, and maintenance based on the manufacturer's documentation.
Installation Requirements and Safety Considerations
Before installing any Broan attic ventilation system, it is crucial to review and adhere to the safety guidelines and installation requirements specified in the manufacturer's documentation. These guidelines are outlined to reduce the risk of fire, electrical shock, or personal injury.
General Safety Guidelines
- Use only for residential purposes: Broan attic fans are explicitly labeled for residential use only. They are not suitable for commercial applications or for providing combustion air to fuel-burning appliances.
- Electrical safety: Always turn off the power at the service panel before servicing or cleaning the unit. Do not operate the fan with a damaged cord or plug. For the FIN-180B model, avoid routing the cord under carpeting or furniture.
- Thermal limitations: The 356BK should not be installed in attics where temperatures may exceed 160°F. The FIN-180B should not be used in environments below 14°F.
- Avoid interference: Do not use the fan with solid-state speed control devices, as they may interfere with the unit's operation.
Installation Environment
Proper installation begins with selecting the correct location and ensuring the unit is mounted securely. Key considerations include:
- Accessibility: Choose a location that allows for regular maintenance and cleaning. A minimum clearance of 14¼ inches is required for the unit door to open.
- Mounting options: The fan can be mounted under a ceiling, on a wall, or hung using threaded rods. Each mounting method requires specific hardware and screw specifications, as outlined in the installation guide.
- Duct placement: The unit must be mounted at least 3.3 feet away from any accessible duct opening to ensure optimal airflow and prevent obstructions.
Step-by-Step Installation Instructions
Broan provides detailed installation instructions for both the FIN-180B and 356BK models. The following outlines the key steps for each.
For the FIN-180B Basic Supply Fan
Unboxing and Inspection
- Remove the unit from its packaging and inspect for any visible damage.
- Locate the installation hardware in a plastic bag included with the unit.
- Place the unit on a protected surface.
Determine Airflow Requirements
- Consult local building codes to determine the required airflow for your space.
- Adjust the airflow settings using a small flat-blade screwdriver. The low range is 30–100 CFM, and the high range is 110–180 CFM.
Mounting the Unit
- Choose a location that allows for easy access and meets the clearance requirements.
- For ceiling or wall mounting, use four 8-18 x 0.375-inch screws to attach the brackets. Use four 10-12 x 0.625-inch screws to secure the unit to the ceiling or wall framing.
- If installing in an attic, ensure the temperature does not exceed 160°F. Secure the unit to the joists using the same screw specifications.
Optional Preheater Installation
- If the ambient temperature is below 14°F, consider installing an in-line heater at least 12 inches away from the supply fan.
- The heater must be sized according to Manual J or ASHRAE standards and equipped with an airflow and over-temperature sensor.
Final Checks and Power Connection
- Ensure the unit is securely mounted and all components are in place.
- Connect the power supply according to the wiring instructions provided in the manual.
For the 356BK Powered Attic Fan
Site Preparation
- Choose a location on the roof or ceiling where the fan can effectively exhaust hot air from the attic.
- Ensure the installation site is free from obstructions and can support the weight of the fan.
Mounting the Fan
- Follow the manufacturer's instructions for securing the unit to the roof or ceiling using the provided hardware.
- Ensure the unit is level and the mounting brackets are properly tightened.
Electrical Connections
- Turn off the power at the service panel before connecting the fan.
- Follow the wiring diagram in the installation guide to connect the unit to the 120V power supply.
Thermostat Configuration
- The 356BK includes an adjustable thermostat for automatic operation. Adjust the setting according to the desired temperature level.
- Test the thermostat to ensure the fan activates when the attic temperature reaches the set point.
Birdscreen Installation
- Install the mesh birdscreen to prevent animals and insects from entering the attic through the fan opening.
- Ensure the screen is tightly secured and does not restrict airflow.
Final Testing
- Once installed, power on the unit and test its operation.
- Listen for unusual noises and verify that the fan is exhausting air as intended.
Configuration and Airflow Adjustments
Proper configuration is essential for the efficient operation of Broan attic fans. Both the FIN-180B and 356BK models offer customizable settings that can be adjusted to meet the specific needs of a home.
Airflow Settings for the FIN-180B
- The fan supports two airflow ranges: Low (30–100 CFM) and High (110–180 CFM).
- Use a small flat-blade screwdriver to adjust the settings on the electrical compartment cover.
- The airflow should be set according to the required ventilation rate for the space being served.
Thermostat Settings for the 356BK
- The 356BK features a built-in adjustable thermostat that allows the fan to operate automatically based on attic temperature.
- The thermostat can be set to activate the fan at a user-defined temperature threshold.
- This feature helps reduce manual intervention and ensures the attic remains within a safe temperature range.
Maintenance and Servicing
Regular maintenance is crucial for the longevity and performance of Broan attic fans. Both models require periodic inspection and cleaning to ensure optimal operation.
Cleaning and Filter Maintenance
- The FIN-180B includes a metal filter that should be cleaned every 6 months using water and mild soap.
A MERV filter may be installed as an optional upgrade. If used, the main filter should remain as a prefilter.
The 356BK does not include a filter but requires the birdscreen to be inspected and cleaned regularly to prevent blockages.
Annual Inspection
- At least once a year, the unit should be inspected by qualified service personnel.
- The inspection should include checking for wear and tear on mechanical and electronic components.
- Ensure the wiring and connections are secure and free from damage.
Troubleshooting Common Issues
- If the fan fails to operate correctly due to external noise or power surges, turn off the power at the service panel and wait 10 seconds before restoring power.
- If the fan runs continuously or does not respond to thermostat settings, check the wiring and thermostat configuration.
Warranty and Support
Broan provides warranty support for both the FIN-180B and 356BK models, provided the installation and maintenance guidelines are followed.
- To qualify for warranty service, the owner must notify the company within 7 days of discovering a defect and provide proof of purchase.
The warranty covers repairs or replacements for defects in materials or workmanship, provided the unit is used in accordance with the manufacturer's instructions.
The company does not reimburse for repairs or replacements made without prior written approval.
- The most current warranty terms can be reviewed on the Broan website at www.broan.com.
Conclusion
Broan attic fans are reliable and efficient solutions for residential ventilation needs. Whether installing the FIN-180B Basic Supply Fan as part of a balanced indoor air system or the 356BK Powered Attic Ventilation Fan to manage attic temperature and moisture, proper installation and maintenance are essential for optimal performance.
By following the manufacturer's guidelines—ranging from safety precautions to airflow configuration and annual servicing—users can ensure their Broan ventilation systems operate effectively for years. These systems not only enhance indoor comfort but also contribute to energy savings, structural preservation, and improved air quality.