Casey from SWISCO responded:
July 22, 2010
I cannot tell by the manufacturer or label if this is the proper series. The stamp options signify different weight tolerances. Remove the window sash and place it on a scale.
26" Series 751 stamp options: 25r will carry a window sash weight range of 10 through 20 pounds 25hd will carry a window sash weight range of 20 through 24 pounds 25tg will carry a window sash weight range of 24 through 30 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. |