DISCHARGE DOORS
SECURITY
The fire and life safety of your
building and occupants rests on your selection of the proper fire
rated discharge door. Both the building codes and the NFPA require
all shafts to be protected with fire rated doors. This includes
the bottom of the chute. Don’t be fooled by other manufacturer’s
statements that their type “A” discharge is of “fire
rated construction.” It doesn’t matter how it’s
constructed, to be fire rated it must bear a UL LABEL. Western
Chutes® type “AC” horizontal
discharge door and type “H” vertical hopper style are
both 1-1/2 hour UL “B” labeled doors meeting all the
code requirements and recommendations of the NFPA.
NFPA #82 Recommendation
excerpt: 3-2.2.9 Chute Discharge Doors. Gravity chutes shall
be constructed so that the base opening of the chute or shaft,
or both, shall be protected by an approved automatic-closing
or self-closing 1-hour fire door suitable for a Class B opening.
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"AC" Discharge
The model “AC” accordion style discharge is Western
Chutes’ latest innovation brought to market. The only type
of FIRE RATED horizontal discharge door in the industry, the model “AC” is
used where the collection bin, cart or compactor is located beneath
the chute. This allows for a free flow of material without creating
an impact point, eliminating clogging of the chute. This door,
like all chute discharge doors, is held open with a fusible link,
which allows the door to close when the ambient temperature reaches
165º to protect the structure and occupants. This door is available
on chutes measuring up to 36" round or square.
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"H" Discharge
The model “H” discharge is used where building conditions
dictate a change of direction for material to pass through a wall.
The hopper sides and top are fabricated of the same material as
the chute (typically #16ga Satin Coat Galvanized Steel) with the
bottom being fabricated of #12ga for superior impact resistance.
The hopper is supported on a structural steel, all welded angle,
iron four-post frame (compared to balancing on a single 2" pipe
as others do). All hopper discharges have a 2" drain connection
at the low point and are equipped with a top hinged spring counter-balanced
door with a fusible link hold open and a cam latch at the bottom
allowing the door to be closed during wash down. This door is also
UL 11/2 hour 250º “B” labeled and is rated at 250ºf
temperature rise in 30 minutes. Additional #12ga reinforcing plates
are available for high impact applications. This discharge is available
for chutes up to 36" in diameter.
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"A" Discharge
Western Chutes® continues to offer this old standard for use
in NON-RATED applications only. While the door is of “Rated
Construction,” this
1" pan style door is mounted with wheels on an inclined steel
track and is held open with a 165º fusible link. This door IS NOT
designed for use as
a shut off gate and is only offered for those die-hards with non-rated
applications
wanting to spend twice the money as they would on a fire rated “AC” discharge
door. Western also offers the type “O” (for open end)
discharge where the chute is left raw, open on the end, for connection
to
incinerators or other applications where
no discharge door is required.
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