Casey from SWISCO responded:
May 9, 2011
The 19-005 and 15-005 balance fitting combination is used on SWISCO Series 380 Balances.
The 21C normally translates to stamp 2130. To check remove the window sash and place it on a scale. A 22" Series 380 Balance with stamp 2130 will carry a window sash weight range of 12 through 15 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. |