£15.00
A flap valve for both the 4″ and 5″ conservation vent grilles or to install in round ducting. The flap can be duct taped directly onto the back of the conservation vent to keep out any insects and prevent any backdraught.
Choose size below:-
.Specification PDF for Cast Iron Cowled Conservation Vent ciabCON1
Flap 4-4" / 100mm, Flap 5-5" / 125mm