Galvanized Universal Register Boot
The versatile boot that connects a round branch to a register’s rectangular opening, in seven sizes.
AirGreen codeAG-VC-01404
514 316-2973 · sales@airgreen.ca
Quick facts
The galvanized universal register boot (boot) connects a round forced-air branch to the rectangular opening of a register. As its name suggests, it is the all-purpose model of the family: it is designed for the most common configurations, which makes it a good boot to keep on hand on a job site.
Fewer models to plan for, more flexibility on site
During a renovation, the position of a joist, a brace or a plumbing pipe often decides how the branch will reach its register. With a universal boot, the installer keeps some leeway to adapt the fitting at installation. For a branch that arrives horizontally under a floor register, the angled boot is also an option; for an opening far from the duct, see the extended boot.
Seven sizes
- 2-1/4 × 10 in: 5 in collar
- 3-1/4 × 10 in: 4, 5 or 6 in collar
- 4 × 10 in: 4, 5 or 6 in collar
The size reads as opening (width × length) × collar diameter. Choose the opening based on the register and the collar based on the branch.
Installation
Hold the boot in position before cutting the floor or drywall. Fasten it securely, screw the duct to the collar and seal the joints with duct sealant or aluminum tape. The register is not included.
Supplied and installed by AirGreen in Greater Montréal
We install forced-air outlets 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 full size and quantity.
One boot for the usual cases
On site you don’t always know ahead of time exactly how each branch will meet its register: the universal boot covers the most frequent layouts.
- Floor, wall or ceiling outlets on a forced-air system, depending on the layout
- Jobs where you want a single boot model on hand
- Replacing an existing boot with the same opening
- Adding an outlet during a renovation
7 sizes, one page
Each size has its own AirGreen code. Tap a row to select it.
| Dimensions | AirGreen code |
|---|---|
| 2-1/4 × 10 × 5 in | AG-VC-01401 |
| 3-1/4 × 10 × 4 in | AG-VC-01402 |
| 3-1/4 × 10 × 5 in | AG-VC-01403 |
| 3-1/4 × 10 × 6 in | AG-VC-01404 |
| 4 × 10 × 4 in | AG-VC-01405 |
| 4 × 10 × 5 in | AG-VC-01406 |
| 4 × 10 × 6 in | AG-VC-01407 |
Rectangular opening (width × length) × round collar diameter, in inches.
Specifications
From the manufacturer’s documentation. A value the manufacturer does not publish is not listed.
What to know before installing
- Sizes read width × length of the opening, then round collar diameter.
- The 2-1/4 × 10 in opening comes only with a 5 in collar in this model.
- Dry-fit the boot on site before cutting the floor or drywall.
- Seal the collar and the edge of the opening with mastic or foil tape.
You may also need
Galvanized Angled Boot
Extended Galvanized Outlet (Boot)
Galvanized Round Pipe – 60 in Length
Galvanized Tapered Reducer
Adjustable Galvanized Round 90° Elbow
Galvanized Round End Cap
Cleats for Galvanized Duct (C and S)
Galvanized Oval Duct – 60 in LengthVentilation ductsSee all
Frequently asked questions
What does “universal” mean?
It is a boot designed to suit the most common ways of bringing a branch under a register. If your case is unusual, send us a photo and measurements and we will confirm the right model.
Which sizes are available?
2-1/4 × 10 × 5 in, 3-1/4 × 10 × 4, 5 or 6 in, and 4 × 10 × 4, 5 or 6 in.
Is the register included?
No, the boot is the sheet-metal fitting only. The register is chosen to match the opening.
Can you install it?
Yes. We install forced-air boots on our new installations and renovations across Greater Montréal.
Boots that adapt to your job
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.