Larger Sterling Double Hungs with Class 5 Balances
We are pleased to announce the availability of Ultra and Heritage Sterling double hungs in larger sizes. Sterling double hungs are now available with glass sizes over 40" x 40" (or 12 square feet per sash), up to a maximum sash weight of 68 lbs. These larger sash are available due to being designed and built with Class 5 balances. Per AAMA 902-07, a Voluntary Specification for Sash Balances, these balances are capable of smoothly operating large residential or commercial sash.
Class 5 balances are the only hardware available for these larger sizes; however, Class 5 balances are available as an option on smaller units as well.