10 Best Foundation Vents of December 2025

• Designed to work effectively
• Convenient and easy to use
• Durable and long lasting
• Country of Origin: United States
• Included Components: Brown Auto Vent

Air Vent

• This are hand tool pin punches
• This are highly durable
• This is manufactured in China

LL Building Products

• Sturdy Galvanized Steel Construction Increases Product Durability and Lifespan
• Install from Outside or Inside of Crawl Space
• 18" x 10" to Cover Block Foundation Wall Openings
• Professional Modern Decorative Designs with Over 80% Open Area
• Mounting Hardware Included

Tjernlund

• Higher Grade Look & Finish: picture frame shadow box frame with recessed screen
• One size covers range of rough openings 5” x 14” (4-7/8” x 13-½” to 6” x 14-½”)
• Also fits 5" x 13" and 4.5" x13 openings with modification
• Easy & quick labor saving install from outside under 2 min. No stucco or siding replacement req.
• Heavy .023 1/8 inch mesh pitch Galvanized mesh offers added protection of keeping swarming bees and wasps out Along with meeting Insurance and Building Codes

EZRvent

• Stamped aluminum - Sliding damper
• 45 sq. in. free area
• #8 mesh screen with lintel
• Fits 16 x 8" opening - Overall size: 17" L X 7.8" H
• Image may slightly differ from actual product due to mfg design changes.

Air Vent Inc

• Replaces old-style manual vents
• Fits standard 8 X 16 in vent opening
• Automatically opens at 70 deg F and closes at 40 deg F (approximately)
• The key mechanism, bi-metal coil, fully enclosed in protective cover
• Stainless steel compression spring with 1 adjustable screw for easy installation

WITTEN AUTOMATIC VENT

• Size- 16"x8"x1/2" made of ABS paintable open area 38.2 sq. in, metal screen, need 6 screws to install it
• Made according to 2012 International Residential Code, Chapter 4, Section R408

Speedvent

• ▼ Air Out ▼ Dimensions L x W x H: 18" x 9" x 2". ▼ Seven Leaves AC Axial Fan. (Dual fans with power cord).
• ▼ Built-in dehumidistat (20% - 80% RH Range). dB level 50-61. ▼ Youtube Video: https://youtu.be/abtAAu2J6Ec
• ▼ Freeze protection thermostat. ▼ UL listed components used. ▼ Measure your crawl space vent opening size before purchasing.
• ▼ Benefits: 1. Reduces moisture in crawl spaces / foundation to protect home and occupants. 2. Increases air circulation to prevent condensation and wood rot. 3. Exhausts vent radon gas, treated wood gases and odors, prevents migrating into living areas. 4. ON/OFF automatically with SET humidity % level. 5. Exchange the outdoor and indoor air, improve room air quality and balance the humidity.
• ▼ It helps to reduce radon level in crawl space, since radon (density) is heavier than air, radon will precipitate in lower floors. ▼ 100% Stainless Steel 430 Grade panel & housing box for longer life in humid environment. (Better than other brands' Galvanized Steel.)

Durablow

• Fits standard 8 inch x 16 inch vent openings
• No electrical hook-up
• High-density thermo plastic construction with stainless steel metal parts

Witten Automatic Vent

• UPC: 008661500013
• Weight: 1.500 lbs

Witten Automatic Vent