And i wont. Anythng over 24 inches just gets to be a hassle to heat and keep the humidity high enough. I wont let my boas drop below 65% humidity. And too dry of humidity will definitely cause cracking in the lung. Take for example you. ever be in a really dry environment for a long time and the inside of your nose dries out and in extreme cases, you get a little nose bleed? Or your in a dry environment and your skin dries and cracks? The same thing will happen to a boa's lung as they are designed for high humidity. Look at where they come from, the humidity there can get up to 90+%. And it pretty much never drops to 45%.
And yes, too stagnant of air can cause an RI but only if there is bacteria or mold or fungus which is usually created by people trying to mist cages too much with too low of airflow and the cage never being able to dry out. Like i said, air humidity is different than just being wet. A mister or humidifier will raise the air humidity but not create a single drop of actual water unless you have it set to high lol.
Anyways, not going to debate anymore. OP, my opinion is ditch that cage and use the money to buy a PVC cage that is 72x30x18 or 24. You will be much happier and it will be much easier to keep the environment spot on.
Here is an example of my cages. The left side is 48x24x12 and 48x24x15. The right side is 72x30x18 cages.
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