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FIGURE 12
FIGURE 10
EXCEPTION TO NON-COMBUSTIBLE FLOORING REQUIREMENT
EXCEPTION TO NON-COMBUSTIBLE FLOORING REQUIREMENT
SIDEFLOW
SUPPLY
PLENUM
CONNECTION
NOMINAL
4 x 4 TIMBER
(SIDES ONLY)
1" MIN.
SUPPLY
PLENUM
(DOWNFLOW)
FIGURE 13
FLAT ROOFTOP INSTALLATION, ATTIC OR DROP CEILING DISTRIBUTING SYSTEM. MOUNTED ON
ROOFCURB, PITCH UNIT TOWARD DRAIN.
BOTH ENDS
MUST BE
SIDEFLOW
OPEN FOR
RETURN PLENUM
DOWNFLOW
CONNECTION
OR SIDEFLOW
DUCTWORK
TO PROVIDE
VENTILATION
3-1/2" MIN.
COMBUSTIBLE
STRUCTURE
RETURN PLENUM
(DOWNFLOW)
FIGURE 14
PITCHED ROOFTOP INSTALLATION, ON ANGLE-IRON STAND, SIDE FLOW DUCTWORK,
ATTIC OR DROP CEILING
DISTRIBUTING SYSTEM.
PITCH UNIT TOWARD DRAIN.
I458
17
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