Bard CH3S1 User Manual

Manual 2100-455M 

Page  14 of 28

Isolation Curb

WM1CF5-X

Sup

ply A

ir

Return Air

Silencer

WAPR11-X

RETURN AIR

Free Blow 

Supply Plenum 

WAFB51-X

Outside Wall

Unit (outside)

Note: duct maybe in attic or 

below rafters as shown.

Note: direction of return

Rafters

Supply Air

Return Air

Outside Wall

Unit (outside)

Rafters

Supply Air

Return Air

Unit (outside)

Finished Ceiling

Finished Ceiling

Finished Ceiling

Supply Air

Rafters

Outside Wall

False Wall Installation

False Wall 

Return Air

Return Air

for lowest sound level as shown.

Grille

Grille

below rafters as shown.

Note: duct maybe in attic or 

grille louvers is pointed down

Grille

Duct

Free Air Flow - No Duct

Ducted Supply - Return At Unit

Duct

MIS-2027

Wall Sleeve

Free Air Flow - No Duct

Low Sound With Acoustical Plenums

And Isolation Curbs