5 600 watt digitals setup ?

ive been doing things for a while but would like some of your thoughts ..here it is i have 5 /600 watt digitals and i need to cool for a closed room environment ...what size fan can i get away with and also id rather push the air so keeping any unwanted smell inside getting scrubbed if you had this setup how would you set it up the hoods are xtrasun 6"cooled should i just use a 6'fan for all of them ..

run all of your lights inline and use a 12" fan at both ends one pushing one pulling.