This single hung offers great performance with a smooth operation.
The 5900 is highlighted by block and tackle balances, tilt-in sash,
recessed tilt latches, automatic sill locks, and dual pull rails.
Our air infiltration is an amazingly low .03! This great
performance is enhanced by features like a sloped sill, dual
weatherstripping, and a center interlock.
Gerkin’s strength is in the ability to perform at a very high level
in air infiltration, water resistance, and thermal performance. One
of the key options Gerkin offers is factory mulling for combination
windows such as hopper, awning, casement, and fixed windows. This
option speeds up installation time and reduces field installation