Anatomy of a Chute

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There are ten primary segments to a chute. Below we will discuss each:

  1. Floor Frame & Padding
  2. Intake Section & Throat
  3. Intake Doors
  4. Vent Cap
  5. Sprinkler
  6. Disinfecting & Flushing System
  7. Discharge Door
  8. Heat Sensor
  9. Pneumatic Doors
  10. NFPA

Floor Frame & Padding

  • Minimum 2” of bearing surface supporting each leg.
  • Opening can be square or round.
  • Rough opening should be 8” wider than the diameter of the chute.



Isolator Pad


Minimum of two inch bearing

Intake Section & Throat

  • 16 Gauge Aluminized Steel with slip joints (allow slight variations in height.)
  • One piece integral throat section (not added in the field).

Fully welded factory throat

Intake Doors

  • Stainless steel, self-closing, self-latching, with protected closer
  • Piano style hinge with deflector flap.
  • UL labeled doors (rated 1.5 hours with max temp rise 250 degrees in 30 minutes)


Vent Cap

  • Purpose of a vent is to dissipate odors and hot gases, smoke and flames in event of fire within the chute.
  • NFPA 82 code requires a full diameter vent penetrating and extending 3’ above the roof.



  • Above the top intake
  • Every alternate floor down to, and including the first floor above discharge
  • Sprinkler heads fuse at 165 degrees F to open up and flood the chute


  • Sprinkler heads are installed in top corner of intake throat, with protective guard.
  • The automatic sprinkler heads furnished with the chute should be installed and piped in accordance with NFPA standards (by others).

Disinfecting & Flushing System

Disinfecting & sanitizing unit (D&S) flushing head & access door

  • A flushing spray head at top of each chute
  • Lockable access door above top intake
  • Manual shutoff valve – (installation & connection by others)
  • D&S reservoir tank & proportioning valve provided by manufacturer
  • D&S unit injects disinfecting solution into the water flow through the flushing spray head system

Protect your company. The CARE Team can perform your annual chute condition check, in accordance with NFPA 82. This relates to intake and discharge doors of Waste and Linen Chutes. Click here to find out more.

Discharge Door

Rolling incline, Accordion Damper & Hopper Type H

  • All held open by a 165 degree fusible link
  • When link is melted, door will roll or slam shut
  • UL labeled vs. UL construction


Heat Sensor

Heat detection sensor & fire alarm

  • Can be installed with both electrical and pneumatic interlock door systems
  • Shuts the chute system down in the event of a fire emergency
  • Shuts off power to the doors at the control box for the electrical interlocks doors
  • Dumps all air from the pneumatic interlock system to prevent the doors from opening


  • The chute system manufacturer provides a hook-up connection only for integration into the building alarm systems (by others).

Pneumatic Doors

Pneumatic & interlocking doors

  • One touch open and automatic close
  • Fully ADA Compliant = no handles
  • Interlocking safety feature (optional)
  • “In Use” button to alert other floors
  • Keep it simple!




National Fire Protection Association

  • 1.5 Hour UL labeled doors (30 minute 250 degree rise)
  • Rated wall assemblies – 2 Hours
  • 165 degree fusible link on discharge doors
  • Automatic Sprinkler above top intake, then alternate floors & include 1st floor above discharge.


  • All subject to local AHJ (Authority Having Jurisdiction) approval
  • NFPA – 45 degree offset for vent above top intake
  • NFPA – 15 degree offset between floors, but then must return to plumb/vertical on next floor


If you have any questions, concerns, or would like to begin the quote process for our chute product, please give us a call or send us a quick message below.