safest way dave Gilmour is to inlet air actively (big tent) or passively (small) from outside to the tent and vent out into house for security reasons, u don't want a big ir signal from venting externally, also I save a lot on heating venting into the house and get nice filtered oxygenated air indoors
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Love um so farNice scales man..how are u liking em.love the 30yr warranty!