Foundation Vents
Ground-level venting, ground-level risk.
Foundation vents sit low on the home, moving air through the crawlspace, cellar, or basement to keep moisture from building up underneath. That same low position puts them in the path of wind-blown embers, which travel well ahead of a fire front and can ignite a home from the inside out through an unprotected opening.
Multiple Flange Options
Every vent opening is a gap in the home’s fire defense.
Wildfire Tested & Code Compliant
Class A siding, stucco, and other fire-resistant cladding protect a home’s exterior surfaces well — but every unprotected vent opening is still a gap in that protection, and the foundation is no exception. V2 Vents close that gap with a stainless steel ember mesh that blocks embers on contact, no activation or reset required, while the V2 Matrix’s intumescent layer stands as a second line of defense against radiant heat and direct flame, expanding to seal the opening when it matters most.
*Some foundation, eave, and soffit models cross-apply between categories — the same vent body fits more than one installation context.
Built for Any Wall Material
Flange styles available:
- Stucco Flange
- Stucco Milcore
- Foam Back Flange
- Fiber Cement Flange
- Flange Front
- Plater Ground Flange
- *Custom Flange*
Foundation / Crawlspace Applications: Flange Styles
Flange Front Foundation Vents
Stucco Foundation Vent
Foam Back Foundation Vent
Fiber Cement Foundation Vent
* These diagrams are conceptual, not installation instructions — consult a licensed building professional for project-specific guidance.
Critical Step
Sealing the Install with EverKem
- Use EverKem 814+ intumescent fire caulking on every V2 Vents installation. Round eave vents use EverKem 136 mortar-based caulking instead, where mounting hardware isn’t practical and flanges run minimal.
- Installation: Run a bead of EverKem behind the nailing flange before setting the vent — this keeps the seam between vent and building material airtight, closing off any gap embers could use to get in.
Close the Gap at the Foundation
Have a question about V2 Vents, wildfire-resistant construction, retrofit work, custom sizes, or a code-aware project? Get in touch and take the next step towards wildfire safety today.
No Baffles.
More Airflow.
Skipping the baffle lets air circulate more freely under the floor, especially in summer — good circulation is what keeps condensation from turning into mildew, mold, and rot underneath the house.
Without an airflow-restricting baffle, each vent delivers more net free area per square inch.
California’s Chapter 7A / CWUIC Chapter 5 Wildland-Urban Interface (WUI) code requires ember- and fire-resistant vents in high-risk fire zones — V2 Vents are built toward that standard, as recommended by the California State Fire Marshal (OSFM).
* Available for both new construction and as retrofit kits over existing openings.
Quality Manufacturing
What’s Built Into Every V2 Vent
V2 Matrix Intumescent Technology
Reacts at critical temperatures to defense against heat and flames
Exceptional Airflow
Our Net-Free-Vent-Area (NFVA) specifications are verified by accredited 3rd parties for airflow performance you can trust!
Code-Aware Design
Built to align with Wildland Urban Interface code in California’s Chapter 5 (Chapter 7A) -> CWUI and beyond -> IWUI etc.
Independently Tested
Evaluated to ASTM E2886 and ASTM2912 for resistance to ember entry and direct flame impingement in both, horizontal and vertical directions.
Foundation V2 Vents Spec Table
Protect the Part of the Home You Don’t See
* Within 5 miles of the coast, copper, stainless steel, or a powder-coated finish holds up better than standard galvanized against salt air. *
Foundation-Soffit V2 Vent
| MFG. PART # | DESCRIPTION | Flange Style | NFVA (sq. in.) | Cut Out (in.) | SPEC SHEET |
|---|---|---|---|---|---|
| FSVFS1824AV | 18" x 24" FOUNDATION ACCESS VENT | Flange Front | 177 | 17.5 x 23.5 |
 |
| FSVFS414FB | 4" x 14" FOAM BACK FLANGE SET BACK 1-1/2" | Foam Back | 24 | 3.5 X 13.5 |
|
| FSVFS414FC | 4" x 14" FIBER CEMENT FLANGE SET BACK 3/8" | Fiber Cement | 24 | 3.5 X 13.5 |
|
| FSVFS414FF | 4" x 14" FLANGE FRONT | Flange Front | 24 | 3.5 X 13.5 |
|
| FSVFS414S | 4" x 14" STUCCO SET BACK 3/4" | Stucco | 24 | 3.5 X 13.5 |
|
| FSVFS614FB | 6" x 14" FOAM BACK FLANGE SET BACK 1-1/2" | Foam Back | 41 | 5.5 X 13.5 |
|
| FSVFS614FC | 6" x 14" FIBER CEMENT FLANGE SET BACK 3/8" | Fiber Cement | 41 | 5.5 X 13.5 |
|
| FSVFS614LFF | 6" x 14" FLANGE FRONT | Flange Front | 20 | 6 X 14 |
|
| FSVFS614FF | 6" x 14" FLANGE FRONT | Flange Front | 41 | 5.5 X 13.5 |
|
| FSVFS614S | 6" x 14" STUCCO SET BACK 3/4" | Stucco | 41 | 5.5 X 13.5 |
|
| FSVFS814FB | 8" x 14" FOAM BACK FLANGE SET BACK 1-1/2" | Foam Back | 62 | 7.5 X 13.5 |
|
| FSVFS814FC | 8" x 14" FIBER CEMENT FLANGE SET BACK 3/8" | Fiber Cement | 62 | 7.5 X 13.5 |
|
| FSVFS814FF | 8" x 14" FLANGE FRONT | Flange Front | 62 | 7.5 X 13.5 |
|
| FSVFS814LFF | 8" x 14" FLANGE FRONT | Flange Front | 31 | 8 X 14 |
|
| FSVFS814S | 8" x 14" STUCCO SET BACK 3/4" | Stucco | 62 | 7.5 X 13.5 |
|
Let’s Build a Safer Future!
Give us a call or submit your information via the form and a team member will get back to you.
Phone
(916) 652-7424
Hours
Mon. – Fri. 8AM – 4PM Pacific Time
