Abib and Jaluria (1992a, b) showed the entering airflow could cause mixing through wall flows and mixing to manifest opposite the ventilation opening with one doorway. The velocity of this air inflow also influences this mixing. Babrauskas (2005) lists a number of unpublished tests of holes through Wooden flooring and https://johnnyiynan.dm-blog.com/26829559/the-2-minute-rule-for-fire-investigation