28 3 Option for 1/2" channel balance
A quick learner from Zephyrhills, FL says:
August 23, 2012
My balances do not have a clear strength mark. The only writing I can find says '28 3 BO CALDWELL'. Does the '28 3'. Mean Inshouldnchoose 2830? These are 1/2 x 29 inch balances.
Tom from SWISCO responded:
August 24, 2012
Thanks for posting! I agree: typically, the stamp "28 3" corresponds to our 2830 option. However, it's always best to double check. The 2830 can carry a sash weight range of 16 through 23 pounds. Does your sash's weight fall within that range?
Please keep in mind that the weight range 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.