FIGURE 10
E
XCEPTION TO NON-COMBUSTIBLE FLOORING REQUIREMENT
I458
BOTH ENDS
MUST BE
OPEN FOR
DOWNFLOW
OR SIDEFLOW
DUCTWORK
TO PROVIDE
VENTILATION
COMBUSTIBLE
STRUCTURE
1” MIN.
NOMINAL
4 x 4 TIMBER
(SIDES ONLY)
SIDEFLOW
SUPPLY
PLENUM
CONNECTION
SUPPLY
PLENUM
(DOWNFLOW)
R
ETURN PLENUM
(
DOWNFLOW)
SIDEFLOW
RETURN PLENUM
CONNECTION
3-1/2” MIN.
FIGURE 13
EXCEPTION TO NON-COMBUSTIBLE FLOORING REQUIREMENT
FIGURE 14
F
LAT ROOFTOP INSTALLATION, ATTIC OR DROP CEILING DISTRIBUTING SYSTEM. MOUNTED ON
R
OOFCURB, PITCH UNIT TOWARD DRAIN.
FIGURE 15
PITCHED ROOFTOP INSTALLATION, ON ANGLE-IRON STAND, SIDE FLOW DUCTWORK,
ATTIC OR DROP CEILING
DISTRIBUTING SYSTEM.
PITCH UNIT TOWARD DRAIN.
18
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