Bryant 310A Installation, Start--Up, Operating, And Service And Maintenance page 18

LINE CONTACT ONLY PERMISSIBLE BETWEEN
LINES FORMED BY INTERSECTIONS OF
THE TOP AND TWO SIDES OF THE FURNACE
JACKET AND BUILDING JOISTS,
STUDS, OR FRAMING.
MANUAL SHUTOFF
GAS VALVE
SEDIMENT
TRAP
Fig. 18 --- Upflow Return Air Configurations and Restrictions
GAS
ENTRY
3
17 / -IN. (451 mm)
4
SHEET
METAL
22-IN. (559 mm)
Fig. 17 --- Typical Attic Installation
18
3
17 / IN. (451 mm) OVER ALL
4-
−IN. (121 mm) UNDER DOOR
3
4 /
4
1-IN. (25 mm) UNDER FURNACE
TYPE-B
EXTEND OUT 12−IN. (305 mm)
VENT
OUT FROM FACE OF DOOR
30-IN. MIN
* WHEN USED WITH
WORK AREA
SINGLE WALL VENT
CONNECTIONS
A02164
A02075