A Cold Climate Must: If you are building in a cold climate area consider specifying the patented 'Vantage Condensation Draining Ball Valve'.

Condensation is moisture that forms on the inside surface of the glass because of the temperature variation between inside and outside.

Internal condensation build-up can damage timber reveals and paint finishes unless it's drained back to the outside or mopped-up with a towel.

Condensation Drainage: The main function for this patented valve is to drain condensation from the inside back to the outside.

Anti-Blowback: When excessive wind blows up through the external, hooded, drainage holes the ball valve lifts and closes the inner drainage hole. Likewise if the sump sill fills with water the ball valve (which floats on water) sits on the surface of the water and eventually closes off the drainage hole.