Vertical Sliding Secondary Glazing Units
Vertical Sliding Secondary Glazing Units are a perfect additional barrier behind existing vertical sliding sash windows. They are fitted with the market-leading Caldwell spring balances which are set based on the weight of the sashes in our factory prior to installation.
The outer frame houses two sashes that slide independently of each other for access to the existing window for ventilation and fire egress. Each vertical sliding secondary glazing unit is manufactured to suit your requirements, and the horizontal meeting stile which sits behind the existing windows' meeting stile can be positioned to ensure a perfect match, so the internal frame cannot be viewed from outside.
There are handles to each opening sash which also lock the sashes in place when closed. On larger units, two handles are provided to balance the sliding sashes during operation.