Well, I'm coming from the perspective of 'yurts are usually drafty and thus cold' unless one intentionally seals everything up tight, such as it sounds like you did--nicely done! Here we're talking about a DIY yurt though--notoriously drafty. A good point about ventilation, though. So I did some reading to figure out appropriate rates.
Basic idea: a room/building contains a certain volume of air (see Jafo's
volume thread), that air goes 'stale' if it just sits in the yurt so you want to swap it out or change it every so often. Usually expressed in 'air changes per hour', or ach. Incredibly drafty, delapidated house: 8 ach. Really tight modern house: 0.35 ach or less. Avg US home: 1-2 ach (
internet source). Once you know the numbers, you get the corresponding fan. Or just open your crown ring if you feel like winging it
Turns out people disagree how much to ventilate. One reasonable
internet engineering source suggests 4 ach min for most spaces but 1-2 ach for residences (10-18 ach for cooling down your house at night). There's an ANSI/ASHRAE Standard 62.1 or 62.2 which in general gives 7.5 cfm per person plus 1-3 cfm per 100 sq ft. So one person in a 20' yurt would need a 11-17 cfm fan. For Pacific's regular 20' yurt, that'd be 0.27-0.42 ach. Some would say ASHRAE estimates are way too high. Control your contaminant sources and you can go way lower. Btw, 20 cfm would be a tiny, really quiet, continuously running bathroom fan--a little goes a long ways.
Ventilation is important:
-It gets ride of chemicals (cleaning solvents; outgassing composite materials, mainly when heated; candle/kerosene fumes, etc)
-It controls humidity (helps prevent condensation potentially leading to mold/miildew)
-It vents things like cigarette smoke/nasty fumes, cooking vapors
-Provides makeup air for wood stoves
-Too much wastes heat
A simple test--does the air smell musty/stale? If yes, ventilate. Is relative humidity high (>50% during winter; not the South/Tropics)? If yes, ventilate. Burning something? Ventilate. Otherwise, I would guess you're probably fine (unless you start feeling ill for no other reasons...).
Re: Almost done!
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