i say hav it blow cuz iv got 2fans, ones a thin tall ocilating fan and the other a small
normal fan but i dont even use the small one. all i do is hav the tall fan rite by the door to suck fresh air in and blow it on my plants and i put it on ocilation occasionaly to hav it blow all the hot air out for a while and remove hot pockets. just my 2cents too