Mm Manufacturing 400-7X6 Tapered Reducer 7x6 Duct Fitting

Product Description

The MM MANUFACTURING 400-7X6 is a tapered round duct reducer designed to transition between two different duct diameters in forced-air HVAC systems. This fitting steps down from a 7-inch inlet to a 6-inch outlet using a smooth tapered profile that reduces turbulence and pressure drop at the transition point. Weighing 0.45 pounds, it is a lightweight, easy-to-handle fitting suited for new construction ductwork runs, equipment changeouts, and service repairs. HVAC installers and sheet metal contractors use this type of fitting wherever a trunk-to-branch or equipment-to-duct diameter change is required.

This reducer is part of the MM MANUFACTURING 400 series, which covers 42 size combinations ranging from 4 inches x 3 inches up to 24 inches x 22 inches. The 400-7X6 fits residential and light commercial forced-air applications where a 7-inch-to-6-inch round duct transition is needed. It is commonly installed on supply or return ductwork trunks, air handler collars, and inline duct runs where airflow must be stepped down to match downstream branch sizing.

Key Features

• Tapered profile reduces turbulence at the diameter transition compared to abrupt step reducers
• 7-inch inlet to 6-inch outlet configuration for common residential duct sizing
• Lightweight at 0.45 pounds for easy single-technician handling and installation
• Part of a 42-size series allowing consistent fitting selection across a wide range of duct diameters
• Overall dimensions of 7 inches length x 7 inches width x 6.5 inches height

Compatibility

Designed as an OEM-style replacement and standard fitting for residential and light commercial round duct systems requiring a 7-inch to 6-inch tapered reduction.

Installation Notes

This fitting is typically installed by licensed HVAC technicians or sheet metal contractors working on forced-air duct systems. Power down the air handling unit or furnace at the disconnect before modifying any ductwork. Secure the fitting with sheet metal screws and seal all joints with listed duct sealant or UL 181-rated tape per applicable mechanical codes. Do not rely on friction fit alone in pressurized duct runs.

Technical Specifications

• Inlet Diameter: 7 inches
• Outlet Diameter: 6 inches
• Length: 7 inches
• Width: 7 inches
• Height: 6.5 inches
• Weight: 0.45 pounds

Standard Information

• Brand: MM MANUFACTURING
• Manufacturer Part Number: 400-7X6