Name the Vaillant?

[stevetheplumber]

Vaillant opent vents have flow & returns out the top....

i knew some thing wasnt right

 

[jonnyswamp]

You're right I'm wrong
Haven't fitted an ov for a few yrs, but should've noticed
Old age don't come on it's own

 

[Scott_D]

https://pbs.twimg.com/media/CYmET6fWEAEUZqs?format=pjpg&name=large