,nip
Will the fan be powerfull enough to suck open the louvres if installed
at bathroom end, or blow them open if installed outside under soffit ?
Which end is preferred ?

Thanks.

David

When I installed ours, as part of the kit I fitted on the outside a
plastic 'flap valve'. A disk which filled the aperture pivoted off
centre, such that it would close under its own weight or if the wind
blew against it, yet the draft from the fan when it was turned on was
enough to open it fully.

Was it one of the B&Q/Greenwood/Marley fans ?
Tnx