Nutone 885al Aluminum Wall Cap with Louver 3-4 Inch

Product Description

The NUTONE 885al is an aluminum wall cap with an integrated louver, designed to terminate 3-inch or 4-inch round duct runs at an exterior wall. It serves as the outdoor exhaust point for residential range hood and bath ventilation fan systems, preventing backdraft and blocking pests and debris when the fan is not running. The cap is fabricated from natural-finish aluminum at 0.025 inches material thickness and includes a 3-inch to 4-inch transition fitting, making it compatible with both duct sizes without requiring a separate adapter. HVAC technicians and ventilation installers handle this fitting as part of a complete exhaust duct assembly.

This wall cap is suited for residential applications where a range hood or bath exhaust fan terminates through an exterior wall using round duct. It accepts both 3-inch and 4-inch round duct directly, covering the two most common duct sizes found in kitchen and bathroom exhaust systems. The included transition piece eliminates an extra trip to the supply house when upsizing from 3-inch to 4-inch duct at the termination point. Manufactured in the USA by Broan-Nutone, LLC, this cap is a direct OEM accessory for Nutone ventilation products.

Key Features

• Aluminum construction at 0.025 inches material thickness for corrosion resistance in exterior applications
• Natural aluminum finish requires no painting and holds up to outdoor exposure
• Integrated louver closes when fan is off, blocking backdraft, insects, and debris
• Accepts 3-inch or 4-inch round duct — fits the two most common residential exhaust duct sizes
• Includes 3-inch to 4-inch transition fitting — no separate adapter needed
• Made in the USA by Broan-Nutone, LLC

Compatibility

Designed for use with 3-inch and 4-inch round duct systems serving range hoods and bath ventilation fans. Suitable as an OEM-style wall termination cap for Nutone and Broan ventilation products using round duct exhaust.

Installation Notes

Installation is typically performed by an HVAC technician or experienced ventilation installer. Power to the exhaust fan must be shut off at the breaker before beginning duct work at the fan end. The wall cap requires a penetration through the exterior wall sized to the duct diameter in use; seal around the cap flange with exterior-grade caulk to prevent air and moisture infiltration. Follow local building codes and manufacturer guidelines for exhaust duct termination clearances from windows, doors, and gas appliance vents.

Technical Specifications

• Material: Aluminum
• Material Thickness: 0.025 inches
• Finish: Natural Aluminum
• Compatible Duct Size: 3 inches round and 4 inches round
• Includes: 3-inch to 4-inch transition fitting
• Country of Origin: USA
• UPC: 784891997068

Standard Information

• Brand: NUTONE
• Manufacturer Part Number: 885al