Ready to Buy?

Call us today at 1-888-820-6509 to set up your HD Supply account or create a web login for your existing account.

Have a Question?

If you need assistance, please contact us.

Find efficiencies, improve your bottom line and find the right product to meet business demands with help from HD Supply.

Preferences have been saved!

* All fields are required.

First Name

Last Name

Account Name

Business Type

Thank You!

We appreciate you signing up. Please check your email within a few hours for confirmation.

Need Assistance?

Visit our help center for useful tips on placing online orders, using web features, and more.

Visit Help Center

Privacy and Security Statement

Home
HVAC
DUCTING & VENTING
DUCT FITTINGS

Duct Fittings

Compare
Products:

Compare

11 result(s) for "Duct Fittings" Clear All Refinements REDUCER All Typically In Stock

Category

DUCT REDUCERS & INCREASERS

Brand

Master Flow

Brand/Model Compatibility

Universal

Duct Size (in.)

General Material

Galvanized Steel

HVAC Product Type

HVAC Part

Pack Size

Product Depth (in.)

Product Height (in.)

5.5

6.0

6.375

Product Width (in.)

Other Refinements

Clearance Items

Items per page: 24 48

Sort By:

Master Flow 4 in. to 3 in. Round Reducer

Compare

Master Flow 4 in. to 3 in. Round Reducer

Item # 3570311

The Master Flow 4 in. x 3 in. Round Reducer is made of galvanized steel. It features hemmed collar edges for enhanced strength and a secure fit. The reducer is used to transition from a 4 in. pipe to a 3 in. pipe in an HVAC system. It is suitable for most HVAC applications.

Hemmed collar edges for an improved fit and increased strength
Connects 4 in. pipe to 3 in. pipe in duct run
Seal seams with code-approved mastic, sealant or duct tape (sold separately)
Always insulate ductwork for greater system efficiency and comfort (insulation not included)

Units: Each

Qty:

Static:
A Static Favorites List is created by adding items to your list from Search and/or Browse results, product detail pages, and previous orders and invoices. You can also upload your list using the Excel template provided on the "Favorites List Management" page.

Dynamic:
A Dynamic Favorites List is automatically created from your purchase history based on the timeframe, ship-to name, and product categories you want included. This list updates each time you open it based on the criteria selected.

Enter a Name for your List:

Master Flow 4 in. to 3 in. 26-Gauge Round Reducer

Compare

Master Flow 4 in. to 3 in. 26-Gauge Round Reducer

Item # 3570321

The Master Flow 4 in. x 3 in. Round Reducer is made of 26-Gauge, galvanized steel. It is used to transition from a 4 in. pipe to a 3 in. pipe in an HVAC system. It features hemmed collar edges for strength and a snug fit. This round reducer is suitable for most HVAC applications.

Used to transition from a 4 in. pipe to a 3 in. pipe in an HVAC system
Always seal seams with building code-approved sealant or duct tape (not included)
Always insulate ductwork for greater system efficiency and comfort (insulation not included)
Hemmed collar edges for a snug fit and increased strength

Units: Each

Qty:

Enter a Name for your List:

Master Flow 6 in. to 4 in. Round Reducer

Compare

Master Flow 6 in. to 4 in. Round Reducer

Item # 3570313

The Master Flow 6 in. x 4 in. Round Reducer is made of galvanized steel. It features hemmed collar edges for enhanced strength and a secure fit. The reducer is used to transition from a 6 in. pipe to a 4 in. pipe in an HVAC system. It is suitable for most HVAC applications.

Hemmed collar edges for an improved fit and increased strength
Connects 6 in. pipe to 4 in. pipe in duct run
Seal seams with code-approved mastic, sealant or duct tape (sold separately)
Always insulate ductwork for greater system efficiency and comfort (insulation not included)

Units: Each

Qty:

Enter a Name for your List:

Master Flow 10 in. to 8 in. Round Reducer

Compare

Master Flow 10 in. to 8 in. Round Reducer

Item # 3570319

The Master Flow 10 in. x 8 in. Round Reducer is made of galvanized steel. It features hemmed collar edges for enhanced strength and a secure fit. The reducer is used to transition from a 10 in. pipe to a 8 in. pipe in an HVAC system. It is suitable for most HVAC applications.

Hemmed collar edges for an improved fit and increased strength
Connects 10 in. pipe to 8 in. pipe in duct run
Seal seams with code-approved mastic, sealant or duct tape (sold separately)
Always insulate ductwork for greater system efficiency and comfort (insulation not included)
Hemmed collar edges to provide strength and a snug fit

Units: Each

Qty:

Enter a Name for your List:

Master Flow 12 in. to 10 in. Round Reducer

Compare

Master Flow 12 in. to 10 in. Round Reducer

Item # 3570320

The Master Flow 12 in. x 10 in. Round Reducer is made of galvanized steel. It features hemmed collar edges for enhanced strength and a secure fit. The reducer is used to transition from a 12 in. pipe to a 10 in. pipe in an HVAC system. It is suitable for most HVAC applications.

Hemmed collar edges for an improved fit and increased strength
Connects 12 in. pipe to 10 in. pipe in duct run
Seal seams with code-approved mastic, sealant or duct tape (sold separately)
Always insulate ductwork for greater system efficiency and comfort (insulation not included)

Units: Each

Qty:

Enter a Name for your List:

Master Flow 5 in. to 4 in. Round Reducer

Compare

Master Flow 5 in. to 4 in. Round Reducer

Item # 3570312

The Master Flow 5 in. x 4 in. Round Reducer is made of galvanized steel. It features hemmed collar edges for enhanced strength and a secure fit. The reducer is used to transition from a 5 in. pipe to a 4 in. pipe in an HVAC system. It is suitable for most HVAC applications.

Hemmed collar edges for an improved fit and increased strength
Connects 5 in. pipe to 4 in. pipe in duct run
Seal seams with code-approved mastic, sealant or duct tape (sold separately)
Always insulate ductwork for greater system efficiency and comfort (insulation not included)
Maximum temperature rating of 390F, minimum temperature rating of -100F

Units: Each

Qty:

Enter a Name for your List:

Master Flow 8 in. to 6 in. Round Reducer

Compare

Master Flow 8 in. to 6 in. Round Reducer

Item # 3570317

The Master Flow 8 in. x 6 in. Round Reducer is made of galvanized steel. It features hemmed collar edges for enhanced strength and a secure fit. The reducer is used to transition from a 8 in. pipe to a 6 in. pipe in an HVAC system. It is suitable for most HVAC applications.

Hemmed collar edges for an improved fit and increased strength
Connects 8 in. pipe to 6 in. pipe in duct run
Seal seams with code-approved mastic, sealant or duct tape (sold separately)
Always insulate ductwork for greater system efficiency and comfort (insulation not included)

Units: Each

Qty:

Enter a Name for your List:

Master Flow 6 in. to 5 in. Round Reducer

Compare

Master Flow 6 in. to 5 in. Round Reducer

Item # 3570314

The Master Flow 6 in. x 5 in. Round Reducer is made of galvanized steel. It features hemmed collar edges for enhanced strength and a secure fit. The reducer is used to transition from a 6 in. pipe to a 5 in. pipe in an HVAC system. It is suitable for most HVAC applications.

Hemmed collar edges for an improved fit and increased strength
Connects 6 in. pipe to 5 in. pipe in duct run
Seal seams with code-approved mastic, sealant or duct tape (sold separately)
Always insulate ductwork for greater system efficiency and comfort (insulation not included)

Units: Each

Qty:

Enter a Name for your List:

Master Flow 7 in. to 4 in. Round Reducer

Compare

Master Flow 7 in. to 4 in. Round Reducer

Item # 3570315

The Master Flow 7 in. x 4 in. Round Reducer is made of galvanized steel. It features hemmed collar edges for enhanced strength and a secure fit. The reducer is used to transition from a 7 in. pipe to a 4 in. pipe in an HVAC system. It is suitable for most HVAC applications.

Hemmed collar edges for an improved fit and increased strength
Connects 7 in. pipe to 4 in. pipe in duct run
Seal seams with code-approved mastic, sealant or duct tape (sold separately)
Always insulate ductwork for greater system efficiency and comfort (insulation not included)

Units: Each

Qty:

Enter a Name for your List:

Master Flow 8 in. to 7 in. Round Reducer

Compare

Master Flow 8 in. to 7 in. Round Reducer

Item # 3570318

The Master Flow 8 in. x 7 in. Round Reducer is made of galvanized steel. It features hemmed collar edges for enhanced strength and a secure fit. The reducer is used to transition from a 8 in. pipe to a 7 in. pipe in an HVAC system. It is suitable for most HVAC applications.

Hemmed collar edges for an improved fit and increased strength
Connects 8 in. pipe to 7 in. pipe in duct run
Seal seams with code-approved mastic, sealant or duct tape (sold separately)
Always insulate ductwork for greater system efficiency and comfort (insulation not included)

Units: Each

Qty:

Enter a Name for your List:

Master Flow 7 in. to 6 in. Round Reducer

Compare

Master Flow 7 in. to 6 in. Round Reducer

Item # 3570316

The Master Flow 7 in. x 6 in. Round Reducer is made of galvanized steel. It features hemmed collar edges for enhanced strength and a secure fit. The reducer is used to transition from a 7 in. pipe to a 6 in. pipe in an HVAC system. It is suitable for most HVAC applications.

Hemmed collar edges for an improved fit and increased strength
Connects 7 in. pipe to 6 in. pipe in duct run
Seal seams with code-approved mastic, sealant or duct tape (sold separately)
Always insulate ductwork for greater system efficiency and comfort (insulation not included)

Units: Each

Qty:

Enter a Name for your List: