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Air Vent rabl Automatic Foundation Vent

Air Vent rabl Automatic Foundation Vent

3.9· 176 ratings

Best price now

$19.88at Max WarehouseObserved at 3:09 PM

Compared across 3 stores. Prices are checked against each store and labelled with when.

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Our take on the Air Vent rabl Automatic Foundation Vent

The Air Vent RABL is an automatic foundation vent for crawlspaces, sized for a 16 in. x 8 in. rough opening. A bi-metal coil opens the louvers near 70°F and closes them near 40°F, so the crawlspace vents itself without you crawling under the house. The black plastic frame has a honeycomb grille that blocks pests while letting air through. At $19.88 at Max Warehouse as of November 4, 2026, it sits at the low end of what the four new listings charge.

Best forCrawlspace owners in cold-winter climatesReplacing a broken or manual foundation ventHomeowners sealing a crawlspace against pests and dampDIY installs in a standard 16 x 8 opening
Pros
  • Opens and closes on temperature with no power or wiring
  • Standard 16 in. x 8 in. rough opening fits most foundation cutouts
  • Honeycomb grille keeps out insects and rodents
  • Black plastic frame resists rot and needs no painting
  • Cheap enough to replace several vents at once
Cons
  • Plastic frame and louvers feel light compared with cast-metal vents
  • Bi-metal coil can stick or drift out of calibration over years
  • Not a substitute for a vapor barrier or powered ventilation
  • Net free area is modest, so large crawlspaces need several units

Air Vent rabl Automatic Foundation Vent prices at every store

  • Max WarehouseNew

    In stock

    $19.88Observed at 3:09 PM
    Visit store
  • WalmartNew

    In stockSold by bestbrandsupply

    $31.13Observed at 3:33 PM
    Visit store
  • ThePaintStore.comNew

    Availability unknown

    $20.66Observed at 3:33 PM
    Visit store

Also available at

  • eBayCheck price at eBay
  • WalmartCheck price at Walmart
  • Ace HardwareCheck price at Ace Hardware
  • DK HardwareCheck price at DK Hardware

Air Vent rabl Automatic Foundation Vent price history

Lowest price we've seen: $19.88 on Nov 4 at Max Warehouse. Tracked across 5 stores since Nov 4.

What reviewers say

Owners rate it around 3.9 out of 5. Most like that it installs in a standard opening and works without power; the common complaints are the plastic build and coils that stop opening or closing after a few seasons.

Pros
  • Fits a standard 16 x 8 opening with little trimming
  • Opens and closes on its own as temperatures swing
  • Grille keeps pests out
  • Good value for the price
Cons
  • Plastic louvers can warp or crack
  • Some units stick open or shut within a few years
  • Coil calibration varies between units
  • Less airflow than expected

About the Air Vent rabl Automatic Foundation Vent

Air Vent Inc. Air Vent Automatic Foundation Ventilator. Foundation Vents allow air to enter and exit the crawlspace. This airflow helps to remove heat and moisture. Fully closes at approximately 40, opens at 70. The crossflow of air helps protect against foundation problems. Heavy-duty construction, Premium bi-metal coil, Honeycomb grill, 16 in. x 8 in. rough opening, 50 sq. in. of net free area airflow each, Opens and closes automatically, Provides a functional way to vent the crawl space of the house. Easy to install, Fights damp rot, mold and mildew, Fights insect and pest infiltration. No. RABL: Size: 8 In. x 16 In., Type: Automatic, Net Free Area: 65 Sq. In., Color: Black, Material: Plastic, Pkg Qty: 1, Package Type: Box No. RABR: Size: 8 In. x 16 In., Type: Automatic, Net Free Area: 65 Sq. In., Color: Brown, Material: Plastic, Pkg Qty: 1, Package Type: Box No. RAGR: Size: 8 In. x 16 In., Type: Automatic, Net Free Area: 65 Sq. In., Color: Gray, Material: Plastic, Pkg Qty: 1, Package Type: Box

Specifications

Type
Vent
finish
BlackSource
color
BlackSource
size
16" x 8"Source

Questions and answers

Is the Air Vent RABL worth it?
For a standard 16 x 8 crawlspace opening, yes. It costs $19.88 at Max Warehouse as of November 4, 2026 and needs no power or wiring. If your crawlspace has serious moisture, pair it with a vapor barrier.
What temperature does it open and close?
It opens at roughly 70°F and fully closes at about 40°F. Between those points the louvers sit partly open.
Will it fit my existing foundation opening?
It is made for a 16 in. x 8 in. rough opening. Measure the cutout before ordering; a smaller or larger hole needs a different size or a frame adapter.
How many vents do I need?
Plan on one vent per 1,500 square feet of crawlspace floor as a rough rule, and more in humid climates. Each RABL provides about 50 to 65 square inches of net free area.
How does it compare with a manual foundation vent?
It costs a few dollars more than a fixed louver but closes itself in cold weather, which manual vents can't do. That saves you two trips under the house each year.
When is it cheapest?
Foundation vents usually drop in fall and early winter, when crawlspace work slows. The current $19.88 at Max Warehouse is already near the bottom of the four new listings.
Where is the Air Vent rabl Automatic Foundation Vent cheapest?
At Max Warehouse, for $19.88, as of our latest check.
What do buyers say about the Air Vent rabl Automatic Foundation Vent?
Rated 3.9 out of 5 from 176 ratings.
Where can I buy the Air Vent rabl Automatic Foundation Vent?
6 stores we checked sell it, including ThePaintStore.com, Walmart, Max Warehouse, eBay, Ace Hardware.

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