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17
30-IN . (762mm)
MIN WORK AREA
6 ″
M IN
*
TYPE-B
VENT
17
3
/
4
″
22
″
SHEET
MET AL
SEDIMENT
TRAP
EQUIPMENT MANU AL
SHUT -OFF GAS VA LV E
LINE CONT A CT ONL Y PERMISSIBLE BETWEEN
LINES FORMED BY INTERSECTIONS OF
THE T OP AND TW O SIDES OF THE FURNA CE
JA CKET AND BUILDING JOISTS ,
STUDS , OR FRAMING.
GAS
ENTR Y
17
3
/
4
″
(451mm)
OVERALL
4
3
/
4
″
(121mm)
UNDER DOOR
1 ″
(25mm)
UNDER FURNACE
EXTEND OUT 12 ″
(305mm)
FR OM FA CE OF DOOR
* WHEN USED W ITH
SINGLE W ALL VEN T
CONNECTIONS
UNION
(152mm)
(451mm)
(559mm)
A10164
Fig. 17 --- Typical Attic Installation
A02075
Fig. 18 --- Upflow Return Air Configurations and Restrictions
310AAV