Casey from SWISCO responded:
February 15, 2017
Hi Bob,
Typically yes, the 28D translates to 2840. We give the window sash weight range so you can weigh the sash to be sure. 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. |