Bosch AquaStar 125B LP Installation And Operating Instructions Manual page 3

MINIMUM INSTALLATION CLEARANCES FROM COMBUSTIBLE AND NON
COMBUSTIBLE MATERIALS FOR ALCOVE OR CLOSET INSTALLATIONS
AQUASTAR MODELS 125B / 125BL / 125BS / 125X
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TOP (A)
FRONT (B)
BACK
SIDES
FLOOR (C)
FLUE DIAMETER
MODEL 125B / 125B LOW
PRESSURE / 125B SOLAR / 125X
12"
4"
0"
4"
12"
5"