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The System Sensor DNR Intelligent Duct Smoke Detector is an addressable non-relay duct smoke detector housing designed to detect smoke traveling through HVAC ductwork. It uses compatible intelligent detector heads to sample air moving through the duct and communicate alarm or trouble conditions to a compatible fire alarm control panel.
The DNR is part of the InnovairFlex family and incorporates low-flow detection technology that supports air velocities from 100 to 4,000 feet per minute. Its pivoting housing can be configured with either a rectangular or square footprint, allowing installation on round or rectangular ductwork.
The DNR uses detection technology to monitor air passing through an HVAC duct.
Air from the duct is directed through the detector housing by an inlet sampling tube. The detector analyzes the sampled air for smoke particles and, when sufficient smoke is detected, the compatible intelligent sensor communicates an alarm condition to the fire alarm control panel.
The fire alarm system can then initiate programmed responses such as shutting down fans or blowers, controlling air-handling equipment, or activating other life-safety functions intended to reduce the distribution of smoke and fire gases through the HVAC system.
The System Sensor DNR is designed to operate over a broad range of HVAC airflow conditions.
Air Velocity Range: 100–4,000 ft/min
Metric Range: 0.5–20.3 m/s
The DNR can accommodate duct widths ranging from approximately:
Minimum Duct Width: 6 inches
Maximum Duct Width: 12 feet
The DNR uses a patented sampling tube system designed to simplify installation and service.
The sampling tube:
The appropriate DST-series sampling tube must be selected based on the width of the HVAC duct.
Proper sampling tube orientation and sizing are essential for reliable duct smoke detection.
One of the main design features of the InnovairFlex DNR is its pivoting detector housing.
The housing can be configured in either a rectangular or square footprint, providing greater flexibility when mounting the detector to different HVAC duct arrangements.
Supported mounting arrangements include:
This configuration allows the wiring compartment and sensor section to be positioned for easier installation and servicing.
The DNR is designed for intelligent addressable fire alarm systems.
The compatible detector head contains the address-setting code wheels and communicates with the fire alarm control panel through the system communication line. Honeywell notes that the detector requires communication-line power only, eliminating the need for a separate detector operating power circuit in standard configurations.
The exact detector head and communication protocol depend on the fire alarm control panel being used. Compatibility should therefore be confirmed using the current System Sensor/Honeywell detector-base cross-reference or control panel documentation.
The DNR supports remote testing and annunciation accessories.
Common compatible accessory families include:
Accessory compatibility should be confirmed for the specific installed detector head and system configuration.
The standard DNR is a non-relay duct detector.
This allows system designers to add relay control capability without requiring a separate remote enclosure in many applications.
The DNR can be configured in two different housing footprints.
Length: 14.38 in / approximately 37 cm
Width: 5.0 in / 12.7 cm
Depth: 2.5 in / 6.36 cm
Length: 7.75 in / 19.7 cm
Width: 9.0 in / 22.9 cm
Depth: 2.5 in / 6.35 cm
Weight: Approximately 1.6 lb / 0.73 kg
The pivoting design allows the same detector housing to be adapted to different duct and installation space requirements.
The DNR is designed for use in HVAC environments within the manufacturer’s specified temperature and humidity limits.
Operating Temperature: −4°F to 158°F / −20°C to 70°C
Operating Temperature with Module Installed: 32°F to 120°F / 0°C to 49°C
Storage Temperature: −22°F to 158°F / −30°C to 70°C
Relative Humidity: 0% to 93%, non-condensing
Air Velocity: 100–4,000 ft/min / 0.5–20.3 m/s
Installation of the DNR typically includes:
System Sensor specifies that the DNR must be installed within the stated airflow and environmental limits for reliable operation.
Testing should confirm:
The front-cover test/reset feature helps simplify routine testing and servicing.
Manufacturer: System Sensor / Honeywell
Model: DNR
Series: InnovairFlex
Product Type: Intelligent Duct Smoke Detector Housing
Primary Function: HVAC Duct Smoke Detection
System Type: Intelligent Addressable Fire Alarm System
Relay: Non-Relay Standard Configuration
Optional Relay Capability: Addressable Form C Relay Module
Operating Air Velocity: 100–4,000 FPM
Duct Width Range: 6 in to 12 ft
Housing Configuration: Pivoting Square / Rectangular
Rectangular Dimensions: 14.38 × 5 × 2.5 in
Square Dimensions: 7.75 × 9 × 2.5 in
Weight: Approximately 1.6 lb / 0.73 kg
Operating Temperature: −4°F to 158°F / −20°C to 70°C
Humidity: 0%–93%, non-condensing
Sampling Tube: DST Series, sold separately
Remote Testing: Supported
Cover Tamper Supervision: Yes
Conduit Knockout: 3/4 in
Listings / Approvals: UL, FM, CSFM
Suitable applications include:
| Weight | 3 lbs |
|---|---|
| Dimensions | 16 × 6 × 5 in |
| Brand |
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The System Sensor DNR Intelligent Duct Smoke Detector is an addressable non-relay duct smoke detector housing designed to detect smoke traveling through HVAC ductwork. It uses compatible intelligent detector heads to sample air moving through the duct and communicate alarm or trouble conditions to a compatible fire alarm control panel.
The DNR is part of the InnovairFlex family and incorporates low-flow detection technology that supports air velocities from 100 to 4,000 feet per minute. Its pivoting housing can be configured with either a rectangular or square footprint, allowing installation on round or rectangular ductwork.
The DNR uses detection technology to monitor air passing through an HVAC duct.
Air from the duct is directed through the detector housing by an inlet sampling tube. The detector analyzes the sampled air for smoke particles and, when sufficient smoke is detected, the compatible intelligent sensor communicates an alarm condition to the fire alarm control panel.
The fire alarm system can then initiate programmed responses such as shutting down fans or blowers, controlling air-handling equipment, or activating other life-safety functions intended to reduce the distribution of smoke and fire gases through the HVAC system.
The System Sensor DNR is designed to operate over a broad range of HVAC airflow conditions.
Air Velocity Range: 100–4,000 ft/min
Metric Range: 0.5–20.3 m/s
The DNR can accommodate duct widths ranging from approximately:
Minimum Duct Width: 6 inches
Maximum Duct Width: 12 feet
The DNR uses a patented sampling tube system designed to simplify installation and service.
The sampling tube:
The appropriate DST-series sampling tube must be selected based on the width of the HVAC duct.
Proper sampling tube orientation and sizing are essential for reliable duct smoke detection.
One of the main design features of the InnovairFlex DNR is its pivoting detector housing.
The housing can be configured in either a rectangular or square footprint, providing greater flexibility when mounting the detector to different HVAC duct arrangements.
Supported mounting arrangements include:
This configuration allows the wiring compartment and sensor section to be positioned for easier installation and servicing.
The DNR is designed for intelligent addressable fire alarm systems.
The compatible detector head contains the address-setting code wheels and communicates with the fire alarm control panel through the system communication line. Honeywell notes that the detector requires communication-line power only, eliminating the need for a separate detector operating power circuit in standard configurations.
The exact detector head and communication protocol depend on the fire alarm control panel being used. Compatibility should therefore be confirmed using the current System Sensor/Honeywell detector-base cross-reference or control panel documentation.
The DNR supports remote testing and annunciation accessories.
Common compatible accessory families include:
Accessory compatibility should be confirmed for the specific installed detector head and system configuration.
The standard DNR is a non-relay duct detector.
This allows system designers to add relay control capability without requiring a separate remote enclosure in many applications.
The DNR can be configured in two different housing footprints.
Length: 14.38 in / approximately 37 cm
Width: 5.0 in / 12.7 cm
Depth: 2.5 in / 6.36 cm
Length: 7.75 in / 19.7 cm
Width: 9.0 in / 22.9 cm
Depth: 2.5 in / 6.35 cm
Weight: Approximately 1.6 lb / 0.73 kg
The pivoting design allows the same detector housing to be adapted to different duct and installation space requirements.
The DNR is designed for use in HVAC environments within the manufacturer’s specified temperature and humidity limits.
Operating Temperature: −4°F to 158°F / −20°C to 70°C
Operating Temperature with Module Installed: 32°F to 120°F / 0°C to 49°C
Storage Temperature: −22°F to 158°F / −30°C to 70°C
Relative Humidity: 0% to 93%, non-condensing
Air Velocity: 100–4,000 ft/min / 0.5–20.3 m/s
Installation of the DNR typically includes:
System Sensor specifies that the DNR must be installed within the stated airflow and environmental limits for reliable operation.
Testing should confirm:
The front-cover test/reset feature helps simplify routine testing and servicing.
Manufacturer: System Sensor / Honeywell
Model: DNR
Series: InnovairFlex
Product Type: Intelligent Duct Smoke Detector Housing
Primary Function: HVAC Duct Smoke Detection
System Type: Intelligent Addressable Fire Alarm System
Relay: Non-Relay Standard Configuration
Optional Relay Capability: Addressable Form C Relay Module
Operating Air Velocity: 100–4,000 FPM
Duct Width Range: 6 in to 12 ft
Housing Configuration: Pivoting Square / Rectangular
Rectangular Dimensions: 14.38 × 5 × 2.5 in
Square Dimensions: 7.75 × 9 × 2.5 in
Weight: Approximately 1.6 lb / 0.73 kg
Operating Temperature: −4°F to 158°F / −20°C to 70°C
Humidity: 0%–93%, non-condensing
Sampling Tube: DST Series, sold separately
Remote Testing: Supported
Cover Tamper Supervision: Yes
Conduit Knockout: 3/4 in
Listings / Approvals: UL, FM, CSFM
Suitable applications include:
| Weight | 3 lbs |
|---|---|
| Dimensions | 16 × 6 × 5 in |
| Brand |
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