Extended Oval-to-Round Fitting (Oval Duct)
The long-body oval-to-round transition, to get through a plate or floor in one piece.
AirGreen codeAG-VC-02501
514 316-2973 · sales@airgreen.ca
Quick facts
The extended oval-to-round fitting joins an oval duct to a round duct on the same axis, like the universal fitting, but with a longer body. That length lets it pass through a sole plate, a floor or another thickness and make the transition in a single piece. It is available in 5 and 6 in.
Fewer pieces between the wall and the basement
At the foot of a riser, the oval duct has to go through the wall’s sole plate and the subfloor before meeting the round branch. With a short transition, you often have to add a piece of oval or round duct, which means one more joint in a hard-to-reach spot. The extended fitting covers that distance in one go. Fewer joints in a closed cavity means less risk of air leaks that no one will ever see.
Universal or extended?
- Universal fitting: when the transition is made in the open, in an unobstructed spot.
- Extended fitting: when it has to pass through a thickness or reach a duct that is farther away.
The exact body length is not shown here. If space is critical, send us the distance to cover before ordering.
Installation
Take the size of your oval duct. Cut the opening in the sole plate or the floor, slide the fitting in, then screw and seal both joints with aluminum tape or mastic before closing up.
Installed by AirGreen across Greater Montréal
We build oval duct risers and their connections 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 you need.
A transition that goes through the obstacle
Between the wall cavity and the basement sit the plate and the floor: the long transition can pass through them and go from oval to round in one piece.
- Taking an oval riser through a plate or floor to a round branch
- Transition between an oval duct and a round duct farther away
- Replacing a transition-plus-stub assembly
- Mixed round and oval forced-air or air exchanger 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.
- Measure the thickness to get through before choosing between the long and the universal transition.
- The body length is not listed here: ask for it if space is critical.
- Screw and seal both joints.
You may also need
Universal 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 End Cap
Cleats for Galvanized Duct (C and S)
45° Flat Oval Elbow (Oval Duct)
90° Flat Oval Elbow (Oval Duct)Ventilation ductsSee all
Frequently asked questions
When should I choose the long transition?
When the transition has to pass through a plate, a floor or another thickness, or reach a round duct farther away, without adding a stub of duct.
How long is it?
It is not listed here. Write to us with the distance to cover and we will confirm before you order.
Can it be cut?
We advise against cutting a transition: you risk damaging the joint. Adjust the straight duct instead.
Can you install it?
Yes. We build oval-duct risers and their connections across Greater Montréal.
Risers connected in one piece
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.