Premiair Portable Air Con Window Seal Kit - EH1927. This Prem-I-Air window seal kit is compatible with portable air conditioning units, tumble dryers and dehumidifiers that utilise an exhaust hose. It is designed for use on casement windows with a maximum perimeter of 4m. The adjustable zip opening function allows the kit to be used on any size exhaust hose, as the zip closes tightly around the hose, creating an air-tight barrier. The kit is designed to improve efficiency by retaining the cool air and expelling the warm air outside via the hose. Additionally, it acts as protection from inclement weather and can also act as an insect barrier. It is very simple to install and 8m of fastening tape is supplied. It can be re-used year in year out so is a one-time purchase.. Product Overview:. Reusable. Improves energy efficiency. Offers weather and insect protection. Suitable for any diameter of exhaust hose. Simple installation with no tools required