Master flow 4 in.
Connecting round duct to square duct.
The table is based on the ducts friction loss formula.
Measure the diameter of your round duct.
Secure the round duct to the.
Overlap one side as you normally would and create a butt joint on the other.
Flange insert box with gasket.
Use a draw band connector to complete the butt joint.
Run the tool around the end of the duct so that you have multiple parallel crimps.
The table below can be used to compare equivalent diameters for rectangular and round circular ducts.
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The equivalent diameter is the diameter of a circular duct or pipe that gives the same pressure loss as an equivalent rectangular duct or pipe.
Divide the diameter by 2 to get the radius of the circular duct cross section.
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Select duct pieces for the connection that have crimped and uncrimped ends.
The diameter is the largest distance from one side of a circle to the.
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20 in x 25 in x 16 in duct square to round.
How to convert a round duct to rectangular step 1.
Good information when installing your return air.
If your supplier doesn t carry draw band connectors make your own by cutting a piece of pipe to overlap the ends and then screw and tape the band into place.
That piece should slide right into the uncrimped piece giving you a secure connection to tape.
The rectangular dimensions and the air flow volume are adapted to the equal friction loss.
Royal metal products 8 x 4 x 4 in.
Round metal duct pipe model bcp6x24 4 98 4 98.
If the ducts are difficult to.
Insert the crimped end of the round duct into the uncrimped end of the next round duct.
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Imperial 4 in x 4 in galvanized steel round duct elbow.
In the example in step 1 8 2 4.
If you don t want to spring for a dedicated tool i ve seen where people use needle nosed pliers to do the crimping.
How to connect duct work.
26 gauge round metal duct pipe model 26cp4x24 5 67 5 67.
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Master flow 6 in.
Slide the round duct coming from the new heater over the round collar of the square to round until it slides past the rubber gasket surrounding the collar.
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Shows you how to connect square ductwork.
