He has 2 light/vents fitted above the shower which are each attached to in- line fans. The output of the fans are then joined together using a Y piece connector which is then connected to a tumble dryer condenser box.
Connecting the output to a tumble dryer box doesn't strike me as a good ide a. Am I right or is it normal practise?
The actual problem was one of the in-line fans not working very well. I re placed this (and its associated light/vent fitting which he broker when try ing to change the bulb) and suction improved.
I also noticed that suction was further improved when the flexible hoses we re not connected together via the Y piece. I assume that there was a degre e of "conflict" with the air flow and that if 2 vents need to be connected, it would be better to have a single fan positioned after the Y connecter p ulling air through rather than 2 fans before it, pushing air through?