Wildfire Knowledge Graph · Built Environment
A vent assembly designed and installed to reduce entry of wind-driven embers while still providing required ventilation.
In plain language
A vent assembly designed and installed to reduce entry of wind-driven embers while still providing required ventilation.
Why it matters
Ember-resistant Vent is useful because it separates one specific part of wildfire behaviour, exposure, operations or evidence from nearby concepts that can otherwise be mixed together.
Ember-resistant vent: test conditions and installation still matter
An ember-resistant vent is designed to reduce the passage of burning particles into vulnerable building spaces under specified conditions. Design approaches can include fine mesh or tested assemblies, but there is no reason to assume every screened opening has equivalent performance.
An appropriate vent selection must account for the jurisdiction’s rules, opening location, airflow requirements and product approvals. Blocking an attic or crawlspace vent altogether without engineering assessment may cause moisture and ventilation problems and may violate building codes.
Assessment example: compare the documented ember-resistance test and approval for the exact vent model, then check installation gaps, surrounding combustible trim and debris accumulation. A certified product incorrectly installed can leave a pathway that a product label does not capture.
Fire exposure may involve radiant heat and direct flames as well as embers. A vent’s ember screening result should not be recast as a universal statement that the complete wall or roof assembly withstands every wildfire exposure.
Continue with Ember Intrusion, Eave Vulnerability and home-hardening guidance.