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W:\ELECTRICAL\MANUAL\BENCH\GENERAL INSTRUCTIONS\BENCHOVEN INS.8-18
3-3.2 Do not place the oven up against a wall. A minimum air space of 3" must be
provided on all sides to allow for air circulation, with additional space being
provided for ovens operating over 450EF (232EC) to keep temperature at adjacent
structures and materials below 160EF (71EC).
3-3.3 Do not store material on top of oven. The oven is not designed to carry exterior
loads. Also, material may get hot, ignite and cause a fire.
3-3.5 The oven doors have spring loaded latches which will allow the doors to open if
pressure develops in the oven. The door travel must not be restricted and should
face away from main aisles, work areas and automatic sprinkler risers, feeds and
cross mains.
3-4 VENTILATION
3-4.1 Where ovens are located in basements or enclosed areas, sufficient room
ventilation shall be supplied to prevent the hazardous accumulation of vapors from
processing.
3-4.2 Fresh air inlets and exhaust outlets must never be restricted.
3-4.3 If the exhaust chamber adapter is used, mount it over the exhaust ports with the
sheet metal screws provided and attach 3" diameter exhaust stack to the adapter
outlet. Outlet can be installed on top or end of exhaust chamber adapter. If this
stack is to be run outside, it must be in accordance with local codes and
requirements. Exhaust gas temperature is the same as internal oven temperature.
Caution must be taken to protect combustible building materials from coming in
contact with the hot exhaust stack.
3-4.4 For additional ventilation information, refer to NFPA 31 AStandard for the
Installation of Oil-Burning Equipment@, NFPA 54 ANational Fuel Gas Code@ and
NFPA 91 AStandard for Exhaust Systems for Air Conveying of Vapors, Gases,
Mists@ and ANoncombustible Particulate Solids@ (see Appendix A).
3-4.5 Exhausts systems should be installed in accordance with Chapter 1, 2 and 3 of
NFPA 91 AStandard for Exhaust Systems for Air Conveying of Vapors, Gases,
Mists and Noncombustible Particulate Solids@ (see Appendix A).
3-5 EXHAUST DUCTWORK
3-5.1 W herever oven ducts or stacks pass through combustible walls, floors, or roof,
non-combustible insulation or clearance, or both, shall be provided to prevent
combustible surface temperatures from exceeding 160EF (72EC).
3-5.2 Where ducts pass through non-combustible walls, floors or partitions, the space
around the duct shall be sealed with non-combustible material to maintain the fire
resistance rating of the barrier. Ducts that pass through fire walls should be
avoided.
3-5.3 Ducts shall be constructed entirely of sheet steel or other non-combustible material
capable of meeting the intended installation and conditions of service. The
installation shall be of adequate strength and rigidity and shall be protected where
subject to physical damage.
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