no it is open to the room. i just moved the ballast outside of the room. that light just gives off so much heat. the blower i have is pretty dam powerful. its definitly blowing hot air out of the room. im really not sure what else to do except get a small wattage light. and on the calmag ive been reading that u only need that with ro or distilled water. im using tap at about 120 ppm. im gonna make that spray you were talking about. and try it out. i guess ill just have to see if the plants flower well at this temp. they have been growing excellent so far so hopefully they keep it up.