Never seen one of these before. Has anyone any experience of fitting/using Sentinel system filters? How do they compare to Magnaclean, Spirovent, etc?
View media item 17426
http://www.screwfix.com/search.do;j...ch=53852-10&searchbutton.x=9&searchbutton.y=9
View media item 17426
http://www.screwfix.com/search.do;j...ch=53852-10&searchbutton.x=9&searchbutton.y=9