---
id:
aliases:
  - 2-way-communication
  - area-of-rescue
  - two-way-communication
tags:
  - authorship/original
  - destiny/permanent
  - occupational/takeoff
  - status/draft
  - type/guide
title: Two-Way Takeoff
dg-publish: true
---
# Two-Way Takeoff

> [!important]
> Complete [[emergency-systems-research]] before beginning takeoff.

> [!info]
> See [[emergency-communications-systems]] for information
> about Two-Way and AoR communication systems.

> `System` = "FA - Two Way Communication"

%%
It's curious we use the longer of FCR to elevator lobbies/FCR to stairwells
rather than just the total length,
since in high-rises _all_ stairwells with locking doors
require communication systems per
[[ibc_s0403#403.5.3.1 Stairway communication system.]]
%%

## Horizontal

1. * `Area` = Same as Fire Command Room

    `FIRE ALARM & DAS SYSTEMS`/`TWO WAY COMMUNICATION ASSEMBLIES`/`2-WAY COMMUNICATION = 1" CONDUIT ...`

    **Length** = Per drawings if shown, otherwise use longer of
    * FCR to elevator lobbies
    * FCR to stairwells

    **Count** = Count of elevator lobbies or stairwells (match length)

## Vertical

1. * `Area` = "Typical - Building All Levels"

    `FIRE ALARM & DAS SYSTEMS`/`TWO WAY COMMUNICATION ASSEMBLIES`/`2-WAY COMMUNICATION = 1" CONDUIT ...`

    * **Length** = 15ft * Count
    * **Count** = match Horizontal

## Firefighter Phone System

> [!important]
> These are ICC definition two-way communication systems,
> redundant with the standard takeoff described above.
> These assemblies can be ignored
> unless given specific direction otherwise.
> Confirmed by Joel Jansen 2025-12-08 in reference to 2100 Crystal Drive.

`COMMON ASSEMBLIES`/`FIRE ALARM & DAS SYSTEMS`/`COMMUNICATION DEVICES ...`/`...`

* firefighter phone jacks
* fire warden station
* fire phone cabinet
