4" by 25' Heavy Duty Ducting.
This ducting can be used to vent lighting systems and cooling systems. When cooling lighting systems it is best to take air from outdoors and run that cool air through the reflectors, then shoot the heated air back outdoors. This will keep temperatures down and if your using bottle carbon dioxide it will keep your co2 levels up.
Price: $26.89 / each
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— Ships from Portland, Oregon USA.