Is it the intent that the chute discharge door that opens into the chute discharge room be a listed self-closing fire door assembly with a minimum 1-hour rating?
Yes. The only door/chute “locking” requirement(s) I have found was for Limited Access Gravity Chutes. Per Section 3-2.4.3.2, “If entrance to a limited-access service opening is gained by key, the service opening door shall not require a key to be opened. One opening or the other shall be keyed. Keying shall be required only for limited-access installations.”
NFPA 82 Standard on Incinerators and Waste and Linen Handling Systems and Equipment, 1999 Edition
Chapter 3 Waste and Linen Chutes and Transport Systems
Section 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.
Section 3-2.3 Chute Enclosure (Chase)
Vertical waste or linen chutes in all stories above the storage or compacting room shall be enclosed within a continuous enclosure constructed of noncombustible materials and extending from the ceiling of the storage or compacting room to or through the roof so as to retain the integrity of the fire separation. The walls of the enclosure, or the walls of the masonry chute, shall have a fire resistance rating of not less than 1 hour if the building is less than 4 stories in height and not less than 2 hours if the building is 4 or more stories in height.
Section 3-2.4 Chute Loading Doors
Section 3-2.4.1 General Access Gravity Waste Chutes
All chute loading doors into a waste chute shall be provided with a self-closing, positive latching frame and gasketed fire door assembly approved for Class B openings and having a fire resistance rating of not less than 1 hour. The door frame shall be fastened into the chute and the shaft wall. The design and installation shall be such that no part of the frame or door projects into the chute.
The area of each chute loading door shall be limited to one-third of the cross-sectional area of a square chute and 44 percent of the area of a round chute.
Section 3-2.4.2 Limited Access Gravity Chutes
All chute loading doors into a linen or waste chute shall be provided with a self-closing, positive-latching frame and gasketed fire door assembly approved for Class B openings and having a rating of not less than 1 hour. The door frame shall be fastened into the chute and the shaft wall. The design and installation shall be such that no part of the frame or door projects into the chute. A key shall be required to open the door.
The area of each waste chute loading door shall be limited to two-thirds of the cross-sectional area of the chute. The area of each linen chute loading door shall not exceed the cross-sectional area of the chute.
Section 3-2.4.3 Service Opening Rooms
Every service opening shall be in a room or compartment that is separated from the other parts of the building by a wall, partition, floor, and floor-ceiling assemblies having a fire resistance rating of not less than the required rating of the chute enclosure. Openings into such a room or compartment shall be protected by approved self-closing doors that are appropriate for protecting the openings and suitable for Class B openings, or not less than 1-hour partition rating with a 3/4-hour door.
Section 3-2.4.3.2 Service Opening Room Key
If entrance to a limited-access service opening is gained by key, the service opening door shall not require a key to be opened. One opening or the other shall be keyed. Keying shall be required only for limited-access installations.
Section 3-2.6 Chute Discharge Rooms
Section 3-2.6.1 Chute Discharge Room Criteria.
Waste and linen chutes shall terminate or discharge directly into a room having a minimum fire resistance rating not less than that specified for the chute. Openings to such rooms shall be protected by approved automatic-closing or self-closing 1-1/2-hour fire doors suitable for Class B openings.
Formal NFPA Interpretations, Reference: 3-2.2.9, F.I. No.: 82-99-1
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