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Fume hood airflow monitor / controller · BACnet points list
Critical Room Control CRC-FHM / CRC-FHC fume hood monitor / controller BACnet points list
Updated 12 November 2026
The CRC-FHM/FHC is a touch-screen fume hood monitor and controller for face velocity, constant volume or sash-sensing volumetric control, driving CRC-CLV valves, exhaust terminals or drives. Its BACnet MS/TP map is all Analog Values: face velocity and flow, sash area and position, hood mode and alarm condition, setpoints and alarm limits, and PI tuning and valve commissioning values.
This page lists 22 BACnet objects for the Critical Room Control CRC-FHM / CRC-FHC fume hood monitor / controller — 12 of them writable — with each object’s type, instance number, name, engineering units and access. It is re-typed from Critical Room Control’s own free documentation, linked below.
- Manufacturer
- Critical Room Control
- Model
- CRC-FHM / CRC-FHC fume hood monitor / controller
- Equipment
- Fume hood airflow monitor / controller
- Equipment type
- Thermostats, sensors & meters
- BACnet objects
- 22 (12 writable)
- Transport
- BACnet MS/TP
- Firmware
- Not stated
- Also known as
- CRC-FHM, CRC-FHC, CRC-FHM/C, CRC-FHC-01-B, Critical Room Control fume hood controller
Reference only, provided as-is: verify against Critical Room Control’s current documentation and the live device before use. Not official Critical Room Control information. Terms of use.
BMS integration notes: Critical Room Control CRC-FHM / CRC-FHC fume hood monitor / controller
Set the MS/TP baud, MAC address and device instance on the touch screen. Write AV 9 to switch the hood between in use, standby and emergency, read AV 5 for face velocity or flow and AV 7 for exhaust CFM, and alarm on AV 10.
Minimum points to map
The short list most integrators start with — enough to run the unit from a BMS. Map more as the job needs.
| Object | Name | Why | Access |
|---|---|---|---|
| AV 9 | Mode | Mode: 1 in use, 2 standby, 3 emergency | Write |
| AV 4 | In Use Set Point | In-use face velocity / flow setpoint | Write |
| AV 6 | Standby Set Point | Standby setpoint | Write |
| AV 5 | Current Air Flow/Velocity | Face velocity or flow, per control type | Read |
| AV 7 | Current CFM | Hood exhaust flow, CFM | Read |
| AV 14 | Current Sash Open Percent | Sash opening, % | Read |
| AV 10 | Condition | Hood alarm: 1 normal, 2 caution, 3 alarm | Read |
Network setup
- Baud rate, MAC address and instance ID are set on the touch screen.
- RS-485 connection; order the -B network option for BACnet.
Watch out for
- Mode and alarm condition are coded AVs; map the numbers to text in the BMS.
- Gain, flow limit and transducer range objects are commissioning values; don't write them routinely.
Critical Room Control CRC-FHM / CRC-FHC fume hood monitor / controller BACnet objects
Type: AI, AO, AV, BI, BO, BV, MI/MO/MV (multi-state) · Access: Read read-only, Write writable, Command writable with a priority array.
| Description | States | |||||
|---|---|---|---|---|---|---|
| AV | 0 | Analog in 1 | Raw signal, analog input 1 (wiring check) | % | Read | |
| AV | 1 | Analog in 2 | Raw signal, analog input 2 (wiring check) | % | Read | |
| AV | 2 | Analog in 3 | Raw signal, analog input 3 (wiring check) | % | Read | |
| AV | 3 | Analog in 4 | Raw signal, analog input 4 (wiring check) | % | Read | |
| AVmin | 4 | In Use Set Point | In-use setpoint (face velocity or flow) | FPM/CFM | Write | |
| AVmin | 5 | Current Air Flow/Velocity | Hood face velocity or flow, per control type | FPM/CFM | Read | |
| AVmin | 6 | Standby Set Point | Standby (unoccupied) setpoint | FPM/CFM | Write | |
| AVmin | 7 | Current CFM | Actual hood exhaust flow | CFM | Read | |
| AV | 8 | Current Sash Area | Sash open area | SQFT | Read | |
| AVmin | 9 | Mode | Hood mode | Write | 1=In use, 2=Standby, 3=Emergency Override, 4=Decommission | |
| AVmin | 10 | Condition | Hood alarm condition | Read | 1=Hood Normal (no alarm), 2=Caution, 3=Alarm | |
| AV | 11 | Alarm High | High alarm setpoint above the control setpoint | FPM/CFM | Write | |
| AV | 12 | Alarm Low | Low alarm setpoint below the control setpoint | FPM/CFM | Write | |
| AV | 13 | Pass through CFM IN | Summed flow from other hoods, passed to the lab controller | CFM | Read | |
| AVmin | 14 | Current Sash Open Percent | Sash position, % of full open | % | Read | |
| AV | 15 | K Factor | K-factor of the CRC-CLV exhaust valve | Write | ||
| AV | 16 | Valve Sensor High | Valve flow transducer range, high | "WC | Write | |
| AV | 17 | Valve Sensor Low | Valve flow transducer range, low | "WC | Write | |
| AV | 18 | P Gain | PI loop proportional gain | Write | ||
| AV | 19 | I Gain | PI loop integral gain | Write | ||
| AV | 20 | Min Flow | Minimum hood flow | CFM | Write | |
| AV | 21 | Max Flow | Maximum hood flow | CFM | Write |
No points match these filters.
Object ID lookup: Critical Room Control CRC-FHM / CRC-FHC fume hood monitor / controller point IDs by name
AV0Analog in 1AV1Analog in 2AV2Analog in 3AV3Analog in 4AV4In Use Set PointAV5Current Air Flow/VelocityAV6Standby Set PointAV7Current CFMAV8Current Sash AreaAV9ModeAV10ConditionAV11Alarm HighAV12Alarm LowAV13Pass through CFM INAV14Current Sash Open PercentAV15K FactorAV16Valve Sensor HighAV17Valve Sensor LowAV18P GainAV19I GainAV20Min FlowAV21Max Flow
Integration notes
- Mode and alarm condition are Analog Values with coded numbers, not multistate objects.
- Setpoints and alarm limits are in FPM or CFM depending on the hood's control type.
- The data sheet prints the AV 16-21 page twice (pages 5 and 6); they are listed once.
- The maker recommends changing the K-factor at the hood controller rather than over the network.
- Modbus, N2 and LON are offered with optional cards; only BACnet MS/TP is listed here.
Check it against the live device. A points list tells you what the controller can expose; the unit in front of you may differ by firmware or installed options. This list is provided as-is for reference only and may contain mistakes — confirming it before you write, map or commission anything is up to you (terms). Easy BACnet scans a network for BACnet IP devices from an Android phone, reads every object on the CRC-FHM / CRC-FHC fume hood monitor / controller and exports what it actually has to Excel — free. New to BACnet? Start with what a BACnet points list is and what the object types mean.
Questions about the Critical Room Control CRC-FHM / CRC-FHC fume hood monitor / controller
How many BACnet points does the Critical Room Control CRC-FHM / CRC-FHC fume hood monitor / controller have?
This list has 22 BACnet objects: 22 analog values. The exact set on a given unit depends on its firmware, installed options and configuration.
Which Critical Room Control CRC-FHM / CRC-FHC fume hood monitor / controller BACnet points are writable?
12 of the 22 objects accept a write. Points marked Command have a priority array: a write holds until it is released, so release it back to automatic when you are done.
Where is the official Critical Room Control CRC-FHM / CRC-FHC fume hood monitor / controller BACnet documentation?
The source is CRC-FHM/C Fume Hood Monitor / Controller data sheet, BACnet Point Map, revision Rev 6.0, published free by Critical Room Control at https://storage.googleapis.com/wzukusers/user-29384423/documents/5a4bb9c11adeea01CgDW/FHC%20Data%20Sheet.pdf.
What are the minimum BACnet points to integrate the Critical Room Control CRC-FHM / CRC-FHC fume hood monitor / controller?
Start with AV 9 Mode (Mode: 1 in use, 2 standby, 3 emergency); AV 4 In Use Set Point (In-use face velocity / flow setpoint); AV 6 Standby Set Point (Standby setpoint); AV 5 Current Air Flow/Velocity (Face velocity or flow, per control type); AV 7 Current CFM (Hood exhaust flow, CFM); AV 14 Current Sash Open Percent (Sash opening, %); AV 10 Condition (Hood alarm: 1 normal, 2 caution, 3 alarm).
How do I check these points on the real CRC-FHM / CRC-FHC fume hood monitor / controller?
Scan the network with a BACnet IP browser such as Easy BACnet, open the device and compare its object list with this table. Anything missing is usually an option that isn't installed or a point that is disabled in the controller's configuration.
Source: CRC-FHM/C Fume Hood Monitor / Controller data sheet, BACnet Point Map · rev. Rev 6.0. Object names, instances and units are reproduced as published; descriptions are our own.