are fans you can get from home depot lowes etc any good? fans at stores like home depot seem very cheap $30-50 bucks but whenever i check out fans online from growing websites they are much more expensive. fans like vortex and others are hundreds of dollars. why the difference in price? should i spend the extra money for a more expensive fan or can i use a cheaper fan from home depot? i want a 6in inline fan and my grow closet isnt to big about 6-7feet long width 2-3 feet and a ceiling of about 8 ft tall.