1. Important Safety Information
Read and understand all instructions before installation and operation. Failure to follow these instructions may result in electric shock, fire, property damage, or personal injury.
- Always disconnect power at the service panel before wiring or servicing the unit.
- All wiring must be performed by a qualified electrician in accordance with all applicable codes and standards.
- This unit is designed for general ventilating use only. Do not use to exhaust hazardous or explosive materials and vapors.
- To reduce the risk of fire or electric shock, do not use this fan with any solid-state speed control device unless specifically approved for this product.
- Ensure proper grounding.
- Do not install this fan over a tub or shower enclosure.
2. Product Overview
The Broan-NuTone L400 is a high-capacity ventilator fan designed for effective air circulation in various indoor environments. It features a robust galvanized steel housing and dual centrifugal blower wheels for efficient and quiet operation.
Image 2.1: Front view of the Broan-NuTone L400 ventilator fan with its white enamel steel grille.
Image 2.2: Side view of the L400 fan, showing the metal duct connector for exhaust.
3. Installation Instructions
This section provides general guidance for installing your L400 ventilator fan. For detailed, step-by-step instructions, refer to the official Installation Manual (PDF) available from the manufacturer.
3.1 Mounting Location
- The fan can be installed in either the ceiling or a wall.
- Ensure the chosen location provides adequate space for the unit (Product Dimensions: 11.75"D x 12.25"W x 21.5"H) and ductwork.
- The unit includes 8-way adjustable brackets for flexible mounting.
3.2 Ducting Options
The L400 fan offers versatile ducting configurations:
- Horizontal Discharge: Ductwork exits horizontally from the unit.
- Vertical Discharge: Ductwork exits vertically from the unit.
- In-Line Ducting: Requires a separate adapter for in-line configurations.
The unit features a 4-1/2" x 18-1/2" duct connector. Ensure compatible ductwork is used.
Image 3.1: Dimensional drawing illustrating the housing and grille measurements for installation planning.
Image 3.2: Top view of the fan unit, highlighting the duct openings and automatic backdraft dampers.
4. Operating Instructions
The Broan-NuTone L400 ventilator fan is designed for continuous or intermittent operation to maintain air quality.
- Power On/Off: The fan is typically controlled by a standard wall switch (Push Button type) connected to the electrical supply.
- Airflow: The fan operates at 434 Cubic Feet Per Minute (CFM) to effectively move air.
- Quiet Operation: Engineered for low noise levels, rated at 2.3 Sones.
- Automatic Backdraft Dampers: These dampers prevent outside air from entering when the fan is not operating.
- Optional Speed Control: For adjustable blower speed and sound level, a Broan Electronic Variable Speed Control (available separately) can be used.
5. Maintenance
Regular maintenance ensures optimal performance and longevity of your ventilator fan. Always disconnect power before performing any maintenance.
5.1 Grille Cleaning
- Periodically remove the white enamel steel grille.
- Clean the grille with a mild detergent and a damp cloth. Do not use abrasive cleaners.
- Ensure the grille is completely dry before reattaching.
Image 5.1: Detail of the grille attachment, showing how it connects to the fan housing for easy removal and cleaning.
5.2 Motor and Blower Wheel Inspection
- After disconnecting power and removing the grille, inspect the blower wheels for dust and debris accumulation.
- Clean the blower wheels carefully with a soft brush or vacuum cleaner.
- The motors are permanently lubricated and do not require additional lubrication.
6. Troubleshooting
If your Broan-NuTone L400 fan is not operating correctly, consult the following common issues before contacting customer support.
- Fan does not turn on:
- Check if the circuit breaker is tripped or the fuse is blown.
- Ensure the wall switch is in the "ON" position.
- Verify all electrical connections are secure (consult a qualified electrician if unsure).
- Reduced airflow or excessive noise:
- Check the grille and blower wheels for dust and debris accumulation. Clean as described in Section 5.
- Inspect ductwork for obstructions or kinks.
- Ensure the backdraft dampers are operating freely and are not stuck.
- Verify the fan is securely mounted and not vibrating against surrounding structures.
- Fan runs continuously:
- If an optional speed control or timer is installed, ensure it is functioning correctly.
If issues persist after troubleshooting, contact Broan-NuTone customer support or a qualified service technician.
7. Specifications
| Feature | Detail |
|---|---|
| Brand | Broan-NuTone |
| Model Name | L400 |
| Style | 434 CFM |
| Air Flow Capacity | 434 Cubic Feet Per Minute |
| Noise Level | 2.3 Sones |
| Voltage | 120V |
| Wattage | 57 watts |
| Amperage | 1.4 amps |
| Product Dimensions | 11.75"D x 12.25"W x 21.5"H |
| Duct Connector Size | 4-1/2" x 18-1/2" |
| Item Weight | 23 Pounds |
| Power Source | AC |
| Switch Type | Push Button |
| Included Components | 8-way adjustable brackets |
| Certification | UL Listed |
8. Warranty and Support
For warranty information and technical support, please refer to the official Broan-NuTone website or contact their customer service department directly. Keep your proof of purchase for warranty claims.
Online Resources: www.broan-nutone.com
Installation Manual (PDF): Download PDF
