The general rule of thumb is at least double the exhaust size hole compare to the hole the fan is blowing into. At least that is modern fire fighting rule of thumb.
Is the any way to put a screen in a doorway and leave the door open? That will help a lot. They make these new cool magnetic screens that auto close behind you.
__________________
שְׁמַע יִשְׂרָאֵל ה' אֱלֹהֵינוּ ה' אֶחָד
|