Ltpgtthis contour 100mm dc extract fan from xpelair is a three speed fan operated by pull cord its design combines both style and energy efficiency including a trickle option which enables the unit to be used as part of a whole house dmev systemltpgt ltpgtthese features ensure a highly effective discreet installation in any environment the cdc100p is ideal for both refurbishment projects and for new build applications it conforms to the latest building regulations can be mo