Fire-Resistant Vents

This is incorrect &#; a half-truth at best.  Some modern houses are engineered to require a precise amount of ventilation.  Most homes in Marin are much older, and their vent openings were not calculated so precisely (if at all).  If you have a brand new home that had the ventilation calculated exactly to the square inch, then it&#;s true, these vents might reduce airflow and require a small number of additional vents to be installed to bring the airflow back up to where it was.  Keep in mind that many of these newer homes ALREADY HAVE EMBER RESISTANT VENTS, since these vents have been in common use since on new construction.

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So, yes, these vents may move slightly less air than older vents.  Many homes have more than adequate airflow, so it&#;s not going to cause problems.  If there were inadequate airflow, it&#;s usually quite easy to add additional vents to make up for the reduced flow through ember-resistant vents.  We strongly recommend that these vents be installed on all homes in Marin&#;s WUI and adjacent areas &#; they are approved by the State Fire Marshal, and any contractor that recommends otherwise is likely just unfamiliar with them or unwilling to do the extra work to add new ventilation.

Michael,

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You should be fine to use screen door material as long as it is very close to the radiator face. There is a similar material used on NASCAR and dirt cars to keep the rads clean (Outerwear is the brand name stuff). If you put it too far forward, the drag and airflow limitations get really big really fast. Put it at the slowest airflow area (right in front of the radiator) to reduce the effects as much as possible.

All of this goes for wire meshes at the inlets too, just not as badly.

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