Honeywell ab1 Duct Air Booster Fan 305 Cfm

Product Description

The HONEYWELL ab1 is a cut-in duct air booster fan designed to increase airflow in low-flow supply air ducts. It installs directly into square or round duct sections without requiring a full duct replacement, making it a practical solution for balancing airflow in problem rooms or zones. The unit delivers up to 305 CFM, giving HVAC technicians a straightforward way to address weak supply runs in existing residential or light commercial forced-air systems. This type of booster is typically installed by licensed HVAC technicians during system balancing or as a callback fix for comfort complaints.

The ab1 is suited for residential and light commercial forced-air HVAC applications where a specific supply run delivers insufficient airflow to a room or zone. Its cut-in design works with both square and round duct configurations, accommodating common duct geometries found in trunk-and-branch and plenum-style distribution systems. It is commonly deployed in retrofit scenarios where extending or resizing ductwork is not practical.

Key Features

• Delivers up to 305 CFM to boost supply airflow in underperforming duct runs
• Compatible with both square and round duct cut-in installations
• Retrofit-friendly design installs into existing duct sections
• Useful for room-by-room airflow balancing without full duct modification

Compatibility

Designed as an OEM-style replacement and retrofit booster for residential and light commercial forced-air duct systems accepting square or round cut-in fan installations.

Installation Notes

Installation should be performed by a licensed HVAC technician familiar with low-voltage wiring and duct system design. Power to the air handler and any related circuits must be shut off at the breaker before cutting into the duct or making electrical connections. Follow all applicable local mechanical and electrical codes, including NEC requirements for in-duct electrical equipment. Do not install in ducts carrying combustion air or in return-side ductwork unless explicitly rated for that application.

Technical Specifications

• Maximum Airflow: 305 CFM
• Duct Configuration: Square or Round Cut-In

Standard Information

• Brand: HONEYWELL
• Manufacturer Part Number: ab1