Questioning About Crawlspace Air Flow? In order to ventilate additional effectively, putting in sub ground fans will permit you to extract moisture and damp/stale air from the sub flooring space and substitute it with current air drawn from the surface by a variety of sub floor followers. Sometimes this http://raymondqssrp.blogofoto.com/26400762/rapid-products-for-sub-floor-ventilation-sydney-an-inside-look