Bob from SWISCO responded:
January 13, 2020
Thanks for writing in. The length of the metal channel is the most relevant measurement here. If the metal channel is 30" long, then you need either our S380-30 or S385-30 channel balances, based on the appearance of the nylon fittings. The only difference between these two balance Series is the 'depth' of the bottom nylon shoe, so compare both with your old hardware to see what matches best. You will need to select a stamp option. Look for a stamp code on the metal channel. If there is none or you are uncertain, weigh your window sash. You can then match that exact weight with one of the weight ranges listed alongside each stamp option on the product page. |