Fig. 4—Horizontal Filter Arrangement
A94307
AIRFLOW
Fig. 5—Downflow Filter Arrangement
A88486
RETURN-AIR
PLENUM
AIRFLOW
ACCESS DOOR
INSTALLATION
POSITION
OF FILTERS
Fig. 6—Model GB1AAV Upflow
A92063
C
OM
24V
HUM
G
R
Y
W
DRAFT
SAFEGUARD
SWITCH
FLUE
COLLECTOR
BOX
MOUNTING
SCREWS
RELIEF
BOX
CONTROL
BOARD
FILTER
RETAINER
WASHABLE
FILTER
Fig. 7—Model GB3AAV Downflow
A92064
VENT PIPE
ENCLOSURE
DRAFT
SAFEGUARD
SWITCH
MANUAL
RESET LIMIT
SWITCHES
AUXILIARY
LIMIT
SWITCH
(WHEN USED)
MOUNTING
SCREWS
RELIEF
BOX
C
OM
24V
HUM
G
R
Y
W
CONTROL
BOARD
—4—