On Friday, 31 January 2020 08:32:50 UTC, JimK wrote:
Looking to install a PIV (positive input ventilation) unit in the loft.

Spec says max draw of the unit is 16w.

Technically/legally can I connect this into the lighting circuits
accessible in the loft space?

If so would a switched fused spur be in order? Or something more?
(Or less :-) )

Yes, and optional if the mfr's instructions want a 3 amp fuse. Personally I would FCU it.

Owain