St0ney

This method is required with CO2 enrichment. Air from outside the growing space is passed through the reflector and back outside. This removes heat directly from the light without pulling the atmosphere from the room. A second blower is required for periodic general venting to prevent excessive moisture buildup in the air (excessively high humidity).
Place the HID blower so it pulls air from the light, and size it from the above application guide for Venting of Heat from HID Light. Place the general venting blower so air is drawn from the top of the space where the air is hottest and vented out. Size it by the above application guide for General Venting. Blowers are rated by the amount of air they move in CFM (Cubic Feet per Minute). Bear in mind that with any duct attached, a blower will only move about 1/2 the rated CFM.

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"A man's ethical behavior should be based effectually on sympathy, education, and social ties; no religious basis is necessary. Man would indeed be in a poor way if he had to be restrained by fear of punishment and hope of reward after death." -- Albert Einstein