Universal Oval-to-Round Fitting (Oval Duct)
The straight fitting that joins an oval duct to a round duct, in line with each other.
AirGreen codeAG-VC-02402
514 316-2973 · sales@airgreen.ca
Quick facts
The universal oval-to-round fitting joins an oval duct to a round duct on the same axis. It does not turn the air: it only changes the shape of the duct. It is the basic transition fitting in the oval family, available in 5 and 6 in.
Going from oval to round where there is room
Oval duct only makes sense in tight spaces. As soon as the duct leaves the wall or ceiling cavity, it is simpler to go back to round: fittings, dampers and equipment are almost all round. The universal fitting makes that switch in a straight line, for example under a wall’s bottom plate, in a basement or at the inlet of an air exchanger.
Choosing the right transition
- Universal fitting: straight transition, for most cases.
- Extended fitting: straight transition with a longer body, depending on the space available.
- 90° oval-to-round elbow: when you also need to turn at the same spot.
Installation
Pick the size of your oval duct; the round side takes the matching round duct. Screw both joints and seal them with aluminum tape or mastic. If you want to adjust the branch’s airflow, install a round damper on the round duct that follows, in a spot that will stay accessible.
Installed by AirGreen across Greater Montréal
We connect oval risers to round duct systems in Montréal, Laval, Longueuil, on the South Shore and on the North Shore. RBQ licence 5645-9605-01, subcategory 15.8 Ventilation. For availability or a quote, call us at 514 316-2973 or email sales@airgreen.ca with the size and quantity.
Changing shape without changing direction
The duct comes out of the wall and carries straight on, but round: the universal transition makes that change without a turn.
- Oval duct leaving a cavity onto a round duct on the same axis
- Connecting an oval riser to an existing round system
- Linking an oval run to a round appliance collar or damper
- Repairs on mixed round and oval systems
2 sizes, one page
Each size has its own AirGreen code. Tap a row to select it.
Size of the oval duct and of the matching round duct.
Specifications
From the manufacturer’s documentation. A value the manufacturer does not publish is not listed.
What to know before installing
- Choose the oval duct size; the round end takes the matching round duct.
- If you also need a 90° turn, the oval-to-round elbow does both at once.
- If there is room for a longer transition, see the long oval-to-round transition.
- Screw and seal both joints.
You may also need
Extended Oval-to-Round Fitting (Oval Duct)
90° Oval-to-Round Elbow (Oval Duct)
Galvanized Oval Duct – 60 in Length
Galvanized Round Pipe – 60 in Length
Galvanized Round Damper (Balancing Key)
Galvanized Round End Cap
Cleats for Galvanized Duct (C and S)
45° Flat Oval Elbow (Oval Duct)Ventilation ductsSee all
Frequently asked questions
Universal or long?
Both join an oval duct to a round duct on the same axis. The long one has a longer body; the choice mostly depends on the room available.
Can I add a damper?
Yes, on the round duct that follows, with a round damper of the same diameter.
Which sizes are available?
5 and 6 in.
Can you install it?
Yes. We connect oval risers to the round system on our installations across Greater Montréal.
Simple, sealed oval-to-round transitions
Tell us the size and the quantity: we confirm availability and send you a quote. Or let our technicians install it for you.
Specifications from the manufacturer’s documentation, checked on October 7, 2026.