a 200-300 cfm exhaust fan can easily pull air from 10 feet away and cool down your entire room , if it has 1 - 1000 watt HID bulb to deal with

if you have a sourse of cool air(new air coming into the room as the hot hair is pulled out).. like a basement... you dont even nee to pull the air straight from the hood.. you just need to change the air in the room... regularly.. and then have a fan blowing on your plants...

: )