A handy person from El Dorado Hills says:
March 10, 2015
I have some windows that weigh only 15.5-16 lbs but have a 32.30 balancer, and other windows that weigh 18-23 lbs that have the same 32.30 balancers. Should my lighter windows actually use the 32.20 balancer? They are all from your 380 Series. Thank you.
Tom from SWISCO responded:
March 11, 2015
Yes, I recommend our 3220 option for a window that weighs 15.5 to 16 pounds. You can reference the chart we have posted on the S380-33 store page to see how much weight each option can hold up.