A quick learner from williamstown, NJ 08094 says:
October 15, 2010
S380 28" The window sash weighs 20 lbs. what option do I need?
Mike from SWISCO responded:
October 18, 2010
Option 2440 will carry a window sash weight of 19 through 24 pounds.
This information is based on 2 balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.