when using a cool tube do I

A- Blow the air onto the bulb, or suck it from the bulb

B- If im sucking it from the bulb do I suck cold air from out side the room or do I suck air from inside the room? ( when I say room I mean small wardrobe)

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Everything I say on here is total Bullsh*t , I just make things up for fun. All my pictures are downloaded from the interwebby thing