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From where? Bringing in outside air is what a 'fresh air' system does like an ERV or HRV
by kshahkshah 3y ago
From where? Bringing in outside air is what a 'fresh air' system does like an ERV or HRV
- SkyPuncher 3y agoMost older homes simple have an outdoor draft/damper for makeup air. You’ll draw in a lot of dirty outside air with that setup if you don’t block/reduce outside air intake. It will still go through a filter, but it’s going to cause the filter to dirty very quickly.