Air Terminals - Grilles, Diffusers, Louvres

[Richard-Jackson-Arup]

device/asset description
air terminal - Extract/Return Air Grille
air terminal - Air Valve
air terminal - Air Supply Diffuser
air terminal - Louvre
air terminal - Inlet Louvre
air terminal - Exhaust Louvre

device/asset name
EG
EAV
SG (suggested as supply grille as in practice SD is confusing with smoke dampers)
LOU
ILOU
ELOU

device/asset documentation
Provide link to a datasheet/manual/any supporting documentation
example document

[RitaLav]

Reviewed and agreed. @Richard-Jackson-Arup could you please create a pull request incorporating your proposed changes above?