Resources & Guides / Building Codes & Standards / CBC Chapter 7A / ASTM E2886
ASTM E2886
Test Method for Evaluating Vents to Resist Embers and Flame
Overview
ASTM E2886 is the critical test standard for evaluating vents in wildfire-prone areas. This test method simulates both ember intrusion and direct flame impingement conditions that occur during wildfires. Products passing this test have demonstrated their ability to prevent fire penetration through ventilation openings.
Test Requirements
- Ember Intrusion Test: Vents exposed to glowing ember bed for 10 minutes
- Flame Impingement Test: Direct flame exposure at 1,100°F for 3 minutes
- Temperature monitoring on unexposed side (must remain below 350°F)
- Visual inspection for flame penetration or sustained ignition
- Cotton indicator test for ember passage
Performance Requirements
| Parameter | Requirement |
|---|---|
| Maximum mesh opening | 1/16" to 1/8" depending on application |
| Flame resistance | No flames on unexposed side |
| Temperature rise | Less than 350°F above ambient |
| Ember resistance | No ignition of cotton indicator |
Applications
- Soffit vents in eaves and cornices
- Foundation and crawl space vents
- Gable end attic vents
- Ridge vents and dormer vents
- Dryer and exhaust vents in WUI zones
Market Insights
Market Demand
Mandatory in California WUI zones affecting over 2 million homes. Expanding to Colorado, Oregon, and other western states.
Insurance Impact
Many insurers require ASTM E2886 compliance for coverage in high-risk areas. Can reduce premiums by 15-25%.
Compliance is Mandatory
All new construction and major renovations in California WUI zones must comply with ASTM E2886.