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Alert System Type
Smoke / Fire / Carbon Monoxide
Sensor Type
Smoke / Heat
Contact Closure / Relay
LED Feedback
Relay Output Support
# of Relays
3 Relays
Normal State
Normally Closed
Normally Open
110V AC
120V AC
220V AC
240V AC
24V DC
Ease of Installation
Beginner (Installs < 10 minutes)
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Be Alerted to Dangerous Smoke in Your HVAC Ducts
APC SM-501-N In-Duct Smoke Detector
APC SM-501-N In-Duct Smoke Detector
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Sampling Tube
APC SM-501-N In-Duct Smoke Detector
Item# 30215
Price: $113.25
Free shipping on orders over $175 - See Details


  • Detects smoke, other products of combustion in duct systems
  • Multi voltage: 24, 115, & 230VAC, 24VDC
  • Two NO/NC relay outputs
  • One NO/NC trouble relay output
  • LED indicators

Essential Info

Your heating and air conditioning system does a great job of moving air throughout your home - but what if there's a system malfunction or a fire? You don't want your HVAC system spreading the smoke and combustion gasses to other areas, you want the system to shut down and notify you. This in-duct smoke detector will do just that. Using a sampling tube, it constantly tests the air inside your HVAC system, looking for smoke and combustion gasses. When everything is normal, there's a flashing green LED on the unit. When it detects these harmful elements, it lights a red LED and energizes its two relay outputs. One can be connected to a strobe light or siren, and one can be used to shut down your HVAC system.

Requires the use of a properly-sized sampling tube:
for ducts between 6" and 30" in width
for ducts between 2.5' and 5' in width
for ducts between 5' and 10' in width


What's Included

  • 1x - In-Duct Smoke Detector
  • 1x - 7" Exhaust Tube
  • 1x - Sampling Tube End Cap
  • 1x - Mounting Template
  • Mounting Hardware
  • 1x - Instruction Manual

  • Specifications

    ManufacturerAir Products and Controls (APC)
    Manufacturer Product No.SM-501-N
    Standby Power Requirement230VAC, 12.0mA
    115VAC, 25.0mA
    24VAC, 35.0mA
    24VDC, 15.0mA
    Alarm Power Requirement230VAC, 16.0mA
    115VAC, 32.0mA
    24VAC, 74.0mA
    24VDC, 56.0mA
    Relay Contact RatingResistive Load 10A @115VAC
    Air Velocity500 to 4000 ft/min
    Ambient Temperature32° to 158°F (0° to 70°C)
    Operating Humidity10 to 85% Non-Condensing/Non-Freezing
    Wiring#12 to #22AWB Solid or Stranded
    ApprovalsUL, CUL (UL268A, UROX, UROX7)
    CSFM (3240-1004:108)
    MEA (73-92-E; VOL 26)
    Materials18G Steel Backbox
    Clear Makrolon Cover
    FinishGray Paint
    Radioactive ElementAmericium 241: 0.9 micro-Curie
    Do not expose to corrosive atmosphere
    Dimensions9.125" x 7.25" x 2.25"

    Important notes:
    Only defective exchanges for identical item within 30 days of purchase. No other returns allowed on this item. For defective returns after 30 days, please contact the manufacturer.
    Manufacturer contact information: Jackson Systems LLC, Tel: (888) 652-9663


    Sampling Tube       
    Sampling Tube       



    Air Products STS-2.5 Sampling Tube for 2.5ft  Air Products STS-5.0 Sampling Tube for 5ft  Air Products STS-10.0 Sampling Tube for 10ft   
    Air Products STS-2.5 Sampling Tube for 2.5ft  Air Products STS-5.0 Sampling Tube for 5ft  Air Products STS-10.0 Sampling Tube for 10ft   

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