Harden Your Home Against Wildfires - Covering Vents & Openings
Vent openings are vulnerable spots for ember entry into the home. Many vents use wire mesh coverings. Some building codes set the minimum mesh size for these at 1/4 inch. Smaller mesh sizes can become clogged by paint, cobwebs, debris, etc. that will reduce airflow. Unfortunately, the 1/4-inch mesh is ineffective in preventing ember entry into the attic, eave, and crawl space vents. For existing homes, consider the following:
Replace 1/4-inch mesh with 1/8-inch mesh if building codes and required airflow allow. Be sure to keep the mesh openings unclogged.
Use metal wire mesh, not plastic or fiberglass.
Don’t store combustible materials, such as paper, clothing, etc., in the attic or crawl space.
Do not plant shrubs in front of or underneath vent openings.
Create pre-made covers out of plywood to install over vent openings if a wildfire is approaching and there is time.
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