6x14 Metal Wall Vents: Free Area, Airflow and Duct Fit
A 6x14 wall vent has a free area of 20.1 square inches and a calculated airflow of 70 CFM, and it drops into a duct opening of 146.1 x 349.3 mm.
- Duct opening
- 5.75″ × 13.75″
- Metric
- 146.1 × 349.3 mm
- Best free area
- 20.1 sq in
- Comes in
- Flush Wall · Framed Wall
6x14 is the largest wall size still built on the 146.1 mm duct width, so it is the biggest step you can take without changing the opening width, at 20.1 square inches of free area and 24 percent open.
Free area and airflow at this size
| Product | Free area | Open | Airflow | Price | |
|---|---|---|---|---|---|
| Flush Wall Vent [Metal] | 20.1 sq in | 24% | ≈ 70 CFM | from $49.99 | View 6x14 |
| Framed Wall Vent [Metal] | 20.1 sq in | 24% | ≈ 70 CFM | from $54.99 | View 6x14 |
Free area is the open cross-section air actually passes through, not the outside of the cover. How we calculate it.
Measuring for this size
The rough opening is 146.1 mm by 349.3 mm, so the extra 50.8 mm over the 6x12 runs along the length only, and in a ceiling install that length normally crosses a joist or a strapping run that has to be headed off.
Is the 6x14 the largest wall vent on a 6-inch duct?
Yes. It is the last size built on the 146.1 mm duct width, at 20.1 square inches of free area and 70 calculated CFM. Everything above it moves to a wider duct, with the 8x14 at 196.9 mm and the 10x10 at 247.7 mm.
What does a 6x14 ceiling install involve?
Heading off the opening in most cases. The cut is 146.1 mm by 349.3 mm, and in typical ceiling framing that 349.3 mm length crosses a joist or a strapping run, so both ends have to be blocked rather than cut straight through. Plan the layout before cutting.
Do you sell the 6x14 in a 5-pack?
Yes. Both the Flush Wall Vent and the Framed Wall Vent come as a single and as a 5-pack in 6x14. Shipping is free on every order, so there is no penalty for mixing 5-packs with singles for the odd openings.
How do I measure for a replacement vent?
Measure the duct opening, not the old cover. Pull the existing vent out, measure the hole itself across the width and the length in millimetres, and match that to the duct dimension listed on this page. Vent sizes are named for the duct, so a vent called 4x10 has a face larger than 4 by 10 inches. Measuring the faceplate is the single most common reason a size arrives wrong.
What happens if I order the wrong size?
Email support@khansupply.co with your order number and the millimetre measurements of your opening, and we will work out which size actually fits and sort out the exchange. Every Khan Supply vent also carries a 2-year warranty against defects, which is separate from a fit exchange.
What does shipping cost?
Nothing. Shipping is free on every order across North America, on a single vent and on a 5-pack alike. You will get tracking by email once the order is on its way. If a vent arrives damaged, photograph the box and the part and email support@khansupply.co, Monday to Friday 9 to 5 ET, and we reply within one business day.
Every Khan Supply vent is all metal, not plastic, and ships free across North America with a 2-year warranty. If a size is wrong, email support@khansupply.co and we sort out the exchange. Mon-Fri 9-5 ET, one business day reply.
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