Ductmate Angle (3.5×3.5×0.7mm)

4.50 out of 5
(2 customer reviews)


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Ductmate – DM 25 is a galvanized, roll-formed flange used in conjunction with DM corner pieces, cleat and gasket to connect ductwork together.


2 reviews for Ductmate Angle (3.5×3.5×0.7mm)

  1. 5 out of 5


    The Ductmate Angle is a versatile and reliable component for ductwork installations, providing stability and support in various HVAC systems.

  2. 4 out of 5

    Haroon Zahid

    easy available and deliver efficiently

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About Item:

Four bolt flange systems meet a SMACNA classification of T24, the strongest transverse connection in rectangular duct.

Ductmate and Ward style flange systems use integral mastic which seals the flange to the duct wall and a butyl gasket between the flanges to virtually eliminate air leakage, making for the highest pressure class of ductwork.

Using Ductmate Flange allows fabricators to drop down a gauge thickness. It might also mean less internal or external reinforcements as it’s a stronger connection than TDC / TDF which is rolled to the same gauge as the Duct Wall.

Used by TDC / TDF shops for jobs that require a lot of job site revisions and installations or in high pressure systems.

Fab shops using Ductmate will cite the ability of using 60″ long duct sections vs 56″: less transverse connections required. They will also cite no notching of duct and no additional sealing.

And finally the aesthetics: visually, there is no end to end connection that looks as good as the Ductmate 4 Bolt system.



Ductmate Flange comes in three different sizes—small, standard and extra large

These days many would argue that there is an increasing % of instances in which the drawings don’t work without job site modification and there are offsets and transitions required because of plans that worked on paper but not on the job site.

With that in mind there is increasing value in the fact that the Ductmate system is one that can be taken off for duct modification in the field vs TDC duct in which the profile is built on the ductwork.

Trim Cut Duct

Sometimes the shop knows ahead that the duct will have to be trimmed back, they aren’t sure how much though. Like pants and alterations, it’s a lot easier to leave something longer and just trim shorter. In these instances, the shop will run it as any other section of duct, but leave the edge end of the duct raw with the intention of trimming it shorter on site.

No sealant required

One of Ductmate’s biggest selling features is that unlike Slip & Drive or TDC/F Duct, there’s no additional sealant required over the transverse joints.

Both Ductmate 35 and J Flange have the permanently tacky 5511 already in the sleeve so that the ductwork slides over the raw edge into the mastic and a sealed connection is assured.

No End Notches are required

This 2 piece duct is going to be connected with Ductmate Flange, thus no profile was formed on the edge. A Notch was therefore not needed because there was no flange or hem to impede the bending process

Ductmate suggests No Notch because if there’s a notch, that means there’s a hole to fill with mastic and an opportunity for leakage.

Screws required in assembly, Snap Cleats along with Carriage Bolts & Nuts used in connection

Drill screws are used in the fabrication process to attach the Ductmate sleeve to the ductwork. However, when hanging two sections in the field, all that is required is 6″ snap cleats and 3/8″ x 1″ carriage bolts/nuts.

The factory recommends cleats instead of screws.

Adding screws through the face Ductmate flange to connect the two mating frames may compromise the integrity of the applied gasket and integral sealant that’s in the flange wall.


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