There really isn't any set formula to follow. If there is any way to place a few of the round vents along the back wall, situated closer to the floor, that should be plenty. Even with your current set up, depending on the gap in the front, you may have plenty of air flow; believe me, it doesn't take a lot to create the proper environment so don't fret too much over it. It sounds like the way you have things now should be fine. I am assuming you open the doors once every day or so and that will provide lots of fresh air exchange.
>>doesn't size of the cage have something to do with it also? My cage is wooden and according to a formula from the cage forum is about 270 gallons. I have hinged doors on the front and there is a gap along the sides. The top and bottom are reinforced so no gap. I also have 2 3" round shower drain vents in the front between the doors. One hi and one low. Should I close these off and move them to the back for crossflow? The sides are mostly glass and would not be enough room. From what you are saying, and talking to Bob at Pro-Products, I may have enough venting, just not placed properly. Is there a general rule of how many square inches of venting per cubic footage of cage space?
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>>I'm having a humidity issue so I'm trying to install an ultrasonic humidfier system in his cage which is driving my venting concern. Right now his cage will stay between 30's and 50's without my constant attention. It only started with the forced air heat in my house for the winter drying out the air in the house. I have a furnace humidifier but I guess it doesn't work to well. I just want to make sure I'm not assuming I understand what you are saying and make sure my snake has what he needs.
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>>Thanx Rob!
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>>DZ
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>>"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf." -- George Orwell
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Rob Carmichael, Curator
The Wildlife Discovery Center at Elawa Farm
Lake Forest, IL