Will it fit my existing 16 x 8 opening?

It is made for a standard 16 in. x 8 in. opening and installs with four screws. Measure the rough opening first, since older frames can be slightly off.

Do I need mortar to install it?

No. It screws into the frame with no mortar, which makes it a straightforward replacement.

How do I open and close it?

The damper is manual and operated from the outside with a push-pull motion. You adjust it by hand each season.

How much airflow does it provide?

The net free area is 67 sq. in. That is modest, so a large crawlspace may need several vents.

Is this a good price?

At $16.93 at The Home Depot as of November 4, 2026, it is in line with typical foundation vent pricing. Check the price history before buying several.

What do buyers say about the Foundation Vent Replacement for 16 x 8 Openings?

Rated 3.7 out of 5 from 72 ratings.

Foundation Vent Replacement for 16 x 8 Openings

3.7

Best price now

$16.93at The Home DepotObserved at 3:33 PM

Prices are checked against each store and labelled with when.

Visit The Home Depot

Foundation Vent Replacement for 16 x 8 Openings

3.7

Best price now

$16.93at The Home DepotObserved at 3:33 PM

Prices are checked against each store and labelled with when.

Visit The Home Depot

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Our take on the Foundation Vent Replacement for 16 x 8 Openings

This is a manual foundation vent that drops into a standard 16 in. x 8 in. crawlspace opening and replaces an old or broken vent. It has a 67 sq. in. net free area, a push-pull damper you operate from outside, and an aluminum screen. It installs with four screws and no mortar. At $16.93 at The Home Depot as of November 4, 2026, it is a low-cost repair part rather than a big-ticket purchase.

Best forReplacing a rusted or broken crawlspace ventNew construction with standard 16x8 openingsHomeowners who want a manual, no-wiring ventSealing a crawlspace against cold and pests by hand

Pros

Fits the common 16 in. x 8 in. opening
No mortar needed; four screws to install
Push-pull damper opens and closes from outside
Aluminum screen keeps out pests
Low price at $16.93

Cons

Manual operation means you go outside to adjust it
ABS resin and vinyl frame, not metal
Small 67 sq. in. net free area limits airflow
Only one store listed at the quoted price

Foundation Vent Replacement for 16 x 8 Openings prices at every store

The Home DepotNew
Availability unknown
$16.93Free shippingObserved at 3:33 PM
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Foundation Vent Replacement for 16 x 8 Openings price history

Lowest price we've seen: $16.93 on Nov 4 at The Home Depot. Tracked across 1 store since Nov 4.

What reviewers say

Ratings average 3.7 out of 5 from 72 buyers, which suggests a workable replacement part with some fit and durability complaints.

Pros

Easy screw-in installation
Fits standard openings
Damper works smoothly

Cons

Some units arrive damaged or warped
Fit can be loose in older openings
Plastic feels thin

From The Home Depot

Replacement manual foundation vent for 16 in. x 8 in. openings
For replacement or new construction
No mortar installation
67 sq. in. net free area (NFA)
Black ABS resin construction

Returns: Return this item within 90 days of purchase; free and easy returns in store or online.
Shipping: Free delivery; ship to store available; 57 ready to ship.

About the Foundation Vent Replacement for 16 x 8 Openings

The GAF Master Flow Replacement Manual Foundation Vent allows air to circulate, helping reduce moisture and decay in the crawlspace, with a NFA of 67 sq. in. No mortar is needed, only 4 screws to install. It opens and closes easily with the push-pull damper and is made of durable ABS Resin. Has heavy-duty screen and fits the standard 8 in. x 16 in. opening.

Specifications

Opening size: 16" x 8"Source
Net free area: 368 Square CentimetersSource
Glass type: Double Pane Obscure GlassSource

Questions and answers

Will it fit my existing 16 x 8 opening?: It is made for a standard 16 in. x 8 in. opening and installs with four screws. Measure the rough opening first, since older frames can be slightly off.
Do I need mortar to install it?: No. It screws into the frame with no mortar, which makes it a straightforward replacement.
How do I open and close it?: The damper is manual and operated from the outside with a push-pull motion. You adjust it by hand each season.
How much airflow does it provide?: The net free area is 67 sq. in. That is modest, so a large crawlspace may need several vents.
Is this a good price?: At $16.93 at The Home Depot as of November 4, 2026, it is in line with typical foundation vent pricing. Check the price history before buying several.
Where is the Foundation Vent Replacement for 16 x 8 Openings cheapest?: At The Home Depot, for $16.93, as of our latest check.
What do buyers say about the Foundation Vent Replacement for 16 x 8 Openings?: Rated 3.7 out of 5 from 72 ratings.