Floor vents / Choose your installation

4×12 metal floor vent covers

Keeping the floor or laying a new one? Compare the installation styles below. The 4×12 label is a nominal size; check your opening against the selected product drawing.

Choose how it fits into your project

Options for Canada · CAD

Check the fit before ordering

1. Measure the opening

Remove the old cover. Measure the clear width and length in several places, including where a duct edge or flooring overhang narrows the space.

2. Check the frame and support

Compare the exact model’s drawing with the opening and the surrounding surface. The outside frame and the part entering the duct are different dimensions.

3. Plan the flooring

Confirm the floor build-up and inlay thickness. An Undermount needs planning at the subfloor stage; a Drop-In still needs a correctly supported fit.

Dimensions and airflow estimates

The figures below are the existing drawing-based calculations. The listed duct geometry is used in those calculations; it is not a cutting template or an installation-clearance allowance. Confirm the exact product drawing before modifying the opening.

4×12 geometric calculations
Style and product sizeDuct geometry, mmGeometric free areaCFM at 500 fpm
Drop-In
4×12
98 × 30017.5 sq in≈ 61
2-in-1 Drop-In
4×12
98 × 30017.5 sq in≈ 61
Undermount
4×12
98.9 × 301.915.3 sq in≈ 53

CFM is calculated from geometric free area at an assumed 500 feet per minute. These figures are not measured airflow or pressure-drop results. Inserts, dampers and the installed system can change the effective opening and airflow. The 2-in-1 estimate uses the Drop-In drawing and does not establish performance with its metal insert fitted. Read the calculation method →

Between sizes or planning an inlay?

Send the opening measurements, flooring thickness and a photo to our support team before ordering. We can help you check the model and drawing.

Ask about fit →