MIL-PRF-83990A
3.5.2 Cabinet. The minimum outside dimensions of the cabinet shall be consistent with the
required thickness of the thermal insulation to ensure minimal heat loss. The cabinet shall provide
space for all wiring, heating elements, controls and for Type II ovens, a forced air circulating
system.
3.5.3 Structural. The entire oven shall provide a rigid structure even with the door(s) open.
The bottom of walk-in ovens shall withstand at least 150 pounds per square foot. Oven bottoms,
other than walk-in ovens, shall be of sufficient strength to withstand a concentrated 50 pound load
anywhere on the oven bottom.
3.5.4 Ventilation. For Type II ovens, ventilators or openings shall be provided in the walls or
top of the cabinet for the entrance and exit of fresh air. The location, size and design shall provide
for a minimum of one complete air change per minute in the oven, except when otherwise specified
in 6.2. The ventilators shall be adjustable, manually controlled from the outside of the oven.
Provisions shall be made for connection of the exhaust ventilator opening to an exhaust duct. The
oven ventilation system shall conform to NFPA 86D requirements.
3.5.5 Instrument opening. Unless specified otherwise in 6.2, there shall be an opening through
a wall of the cabinet near the top for the insertion inside the oven of temperature sensing
element(s), other than those which are part of the normal oven instrumentation. Provisions are
required to seal the opening when it is not in use.
3.5.6 Shelf supports. Shelf supports shall be attached to the right and left walls of the interior
of the oven. The supports shall permit shelves to be spaced at vertical intervals which are
adjustable from top to bottom in accordance with the requirements specified in 6.2. Unloaded
shelves shall remain horizontal when withdrawn approximately one-half the depth of the cabinet
chamber.
3.5.7 Shelves. Shelves for other than walk-in ovens shall approximate the width and depth of
the oven working chamber. The number required shall be as specified in 6.2. When shelves or
partial shelves are required for walk-in ovens, the type, size, number and location shall be as
specified in 6.2. Shelves shall be easily removable from the oven. The shelves shall be capable of
supporting a 50 pound load without deflecting more than one fourth inch or sustaining any
permanent deformation.
3.5.8 Forklift supports. Unless otherwise specified in 6.2, the cabinet shall be constructed in
such a manner as to permit forklift use during installation or subsequent movement. The supports
shall be of sufficient strength to support the oven assembly and the work load.
3.5.9 Doors. The oven shall have a side hinged single door (Style 1) or double doors (Style 2)
as specified in 6.2. Door(s) shall permit full width and height access to the working area when
open. The door(s) when shut shall be close fitting within the door opening to minimize heat loss
and shall seat tightly against a suitably resilient seal around the edge to prevent air leakage. Walk-
in ovens shall have door(s) which open safely and easily from both the outside and the inside.
Latches shall provide positive latching and fast release of the closed door(s).
3.5.10 Thermal insulation. Thermal insulation shall be heat-resisting material which is non-
combustible, non-hygroscopic, non-powdering, and which will not settle. Insulation shall contain
no Class 1 ozone depleting chemicals nor any EPA-17 chemicals. The insulation shall be sufficient
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