45° Flat Oval Elbow (Oval Duct)
The 45° oval elbow that angles the duct off while staying flat in the ceiling.
AirGreen codeAG-VC-02202
514 316-2973 · sales@airgreen.ca
Quick facts
The 45° flat oval elbow turns an oval duct by 45° while keeping it in the same plane. It is used to run a diagonal path through a ceiling or a floor, or to soften a turn by making it in two steps. It is available in 5 and 6 in.
A shorter run, better airflow
Every turn and every metre of duct adds resistance. When an outlet sits diagonally from the starting point, a diagonal run shortens the path and avoids a series of right-angle turns. The 45° flat elbow also lets you get around a recessed light, an electrical box or a brace without dropping the ceiling.
Two common uses
- Simple offset: one elbow to angle off, a second to come back in line further along.
- Gradual turn: two 45° elbows separated by a short piece of duct replace a 90° elbow.
Installation
Lay out the route taking joists and obstacles into account, then cut the duct sections to the right length. Screw each joint and seal it with aluminum tape or mastic. Support the duct so the joints do not carry its weight. If the duct runs through an unheated space, insulate it.
Installed by AirGreen in Greater Montréal
We install oval 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.
Taking a diagonal shortcut
The shortest way to an outlet is sometimes on a diagonal: the flat 45° elbow angles the duct off without it sticking out.
- Angling an oval duct off in a ceiling or floor
- Getting around a pot light or a flat obstacle
- A gentle two-step turn, with two 45° elbows
- Air exchanger systems in low spaces
2 sizes, one page
Each size has its own AirGreen code. Tap a row to select it.
Oval duct size.
Specifications
From the manufacturer’s documentation. A value the manufacturer does not publish is not listed.
What to know before installing
- Choose the same size as the oval duct.
- Two flat 45° elbows can replace a 90° elbow with a more gradual turn.
- Check the diagonal route against the joists before cutting.
- Screw and seal both joints.
You may also need
90° Flat Oval Elbow (Oval Duct)
45° Vertical Oval Elbow (Oval Duct)
Galvanized Oval Duct – 60 in Length
Oval Ceiling Boot (Oval Duct)
Galvanized Round End Cap
Cleats for Galvanized Duct (C and S)
90° Oval-to-Round Elbow (Oval Duct)
Adjustable Galvanized Round 90° ElbowVentilation ductsSee all
Frequently asked questions
When should I pick 45° over 90°?
When a gentle turn is enough, or to get around an obstacle on an angle. Two 45° elbows with a short piece of duct between them also make a more gradual 90° turn.
Flat or vertical 45° elbow?
The flat elbow angles the duct within its plane, with no change in height. The vertical elbow makes it rise or drop.
Which sizes are available?
5 and 6 in.
Can you install it?
Yes. We install oval-duct systems on our ventilation jobs across Greater Montréal.
More direct duct routes
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.