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Manrose 1230L 4"  back draught shutter.Can be mounted onto the spigot of the 4" XF, XP, or SF fan or in-line in the ducting.Also available in 5" or 6" versions.PVC construction...

MANROSE DHRIWKWBS100mm/4" Deluxe Quick Internal Fit Wall Kit with Backdraught Shutter The Manrose Deluxe Quick Internal Fit Wall Kit can be installed entirely from the inside of a property, reducing installation time and removing the need for costly and time consuming external grille fitting invol..