hybridway2
Amare Shill
You do Not want to draw cold outside air through your hps hoods. For a few reasons. One major one is the negative effects the cold air has on the bulb. HPS/MH bulbs need to burn hot to maintain their spectrum, efficiency & efficacy or longevity. Unlike leds, cooling an hps beyond venting ambient is not good. Goal is to remove the excess heat w/o cooling the bulbs past a certain point.Sounds like you just need to dump the heat from the lights outside. An isolated system that draws outside air in and pushes it through the lights and back outside would do the trick. Plus not evacuate the c02 from your space.
I run a single 8" Fan/Filter mounted up high and Y'd to 2 6" ducts which push through my hoods. From the other side of the Hood air is moved outside my "Grow Box" which is just dumped inside my garage. I am in a very mild summer climate. When garage temps rise to the set point on my gable vent fan the garage is vented and thus cooled.
Works like a charm for me
Draw from inside the house or wherever (if cold winter months) & dump outside or heat something with it.
