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Duct Smoke Detector 4-Wire Photoelectric Smoke Detection

Name: Duct Smoke Detector 4-Wire Photoelectric Smoke Detection
Brand: HVAC Store
SKU: D4210
Price: 175.0 USD
Availability: InStock
Rating: 4.95 (12 reviews)

By HVAC Store | Model: D4210 | ID: 30173

✓ Manufactured in the USA
✓ No Sales Tax - in most states excluding California
✓ Manufacturer Warranty Included
✓ Most Products In Stock - Call or Text (833) 658-3387 for availability

$175.00 + FREE SHIPPING

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Product Details
Specifications
Documents
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Reviews

Product Details

Duct Smoke Detector 4-Wire Photoelectric Smoke Detection D4210

Smoke introduced into an air duct system can quickly spread throughout an entire building, making early detection critical. The D4120 and D4S Duct Smoke Detectors are specifically designed for HVAC air duct applications, providing reliable smoke detection before hazardous conditions escalate. Using advanced 4-wire photoelectric sensing technology, these detectors continuously sample airflow within the duct to identify the presence of smoke at its earliest stages.

When smoke is detected, the system initiates an alarm signal that can trigger appropriate safety responses such as shutting down fans and blowers or changing air-handling modes. These actions help manage the movement of toxic smoke and fire gases, improving overall building safety. Designed for flexibility and integration, the D4120 and D4S models support multiple power options and interface seamlessly with control panels and HVAC systems.

Product Features

Duct smoke detector designed for HVAC air duct smoke detection
4-wire photoelectric smoke sensing technology for early detection
Efficient housing design samples air passing through the duct
Initiates alarm signals to support fan shutdown and system control
Designed to operate on 24 VDC, 24 VAC, or 120 VAC power sources
Alarm and supervisory relay contacts for control panel integration
Auxiliary relay provided for fan and blower shutdown
Detector interconnection supports signaling of up to 50 detectors for coordinated fan shutdown
Not designed for 2-wire applications

Detector Feature Set

Utilizes 2D51 plug-in detector head
Supports up to two sensors per power board
Cover missing signal for system monitoring and diagnostics
Sampling tubes install from the front or rear of the detector housing
Compatible with existing duct smoke detector accessories

Ideal Applications

Commercial HVAC air duct systems
Office buildings and institutional facilities
Industrial and large residential ventilation systems
Applications requiring coordinated fan shutdown and smoke control

Specifications

Duct Smoke Detector 4-Wire Photoelectric Smoke Detection D4210

SKU	D4210	Humidity	0% to 95% RH, Non-condensing
Operating Temperature	–4° to 158°F (–20° to 70°C)	Storage Temperature	–22° to 158°F (–30° to 70°C)
Air Velocity	100 to 4000 ft/min (0.5 to 20.3 m/sec)	Weight	2.5 lbs (1.14 kg)
Footprint Dimensions (Rectangular)	14.38 × 5 × 2.5 in	Footprint Dimensions (Square)	7.75 × 9 × 2.5 in
Power Supply Voltage	20–29 VDC / 24 VAC / 120 VAC	Reset Voltage	3.0 VDC / 2.0 VAC / 10 VAC min
Power Up Time	35 sec max	Alarm Response Time	15 sec
Max Standby Current	21 mA @ 24 VDC / 65 mA @ 24 VAC / 20 mA @ 120 VAC	Max Alarm Current	65 mA @ 24 VDC / 135 mA @ 24 VAC / 35 mA @ 120 VAC

Documents

Duct Smoke Detector 4-Wire Photoelectric Smoke Detection D4210

Operation PDF Guide

Shipping

We ship freight to the 48 contiguous states, excluding Hawaii and Alaska. Some shipping restrictions may apply. Liftgate services may incur an additional fee, which can be added at checkout.

Order Processing: Orders are processed within 1-3 business days (excluding weekends). Orders placed on Fridays will be processed the next business day. Once shipped, you’ll receive an email confirmation with tracking details. Backordered products may have longer processing times, and we will notify you of any delays.

Arrival of Goods: Freight delivery times depend on the carrier's schedule and routing. Estimated delivery times are provided at checkout. The carrier will contact you to arrange delivery, and you must be present to sign for the shipment.

Damages: Upon delivery, inspect your shipment carefully for any damage or discrepancies. Note any issues on the carrier’s delivery receipt and notify us within 24 hours. Claims made after this timeframe may be denied. Photographic proof is required for processing claims. Report damages or discrepancies immediately at support@hvacstore.com.

Returns: For returns unrelated to damage, contact us at support@hvacstore.com for authorization. Return shipping costs are the customer’s responsibility, and a 20% restocking fee applies. Items must be in original packaging and condition for a refund.

Delivery Receipt: Before signing the delivery receipt, inspect the shipment for any damage. Your signature confirms acceptance of the delivery unless issues are noted.

Policy Updates: Our shipping policy may change, and updates will be communicated via our website or other channels. For any questions, contact The HVAC Store at support@hvacstore.com or call (833) 658-3387.

Reviews

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New heater

Nice unit except for 2 small things! 2 screws laying in bottom of unit that holds in the main board and 2 wires, a purple and yellow, off the limit controller on the blower! Other then that, working good!

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Quality above my expectations and great delivery!

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Thank you shannelle and jason for helping put my order together

Quick shipping, the part fixed our HVAC Problem. Thanks!

Unfortunately was wrong part, had different electrical connection. Misidentified by manufacturer. Vendor did a great job making it right, contacted the manufacturer and finding the correct part.

furnace

fast shipping and furnace working good installed today.

Great service.

Great service and very fast Shipping

As advertised and fast delivery!!

My interface with HVACStore was very good.

My transaction with the HVACStore was very good. It deserved a 5 star but I dinged it one star because the freight company did not deliver my new packaged unit on December 11th as they had communicated to me they would. They finally delivered at 3 PM the next day, December 12th. I and my installer had driven to Raleigh, NC (115 miles) on December 10th expecting the installation to start the next day. We were able to get the unit set in place the afternoon of the delivery but noting more that day. The following day we were able to install the unit and make it fully functional, but we did not have time to install an enclosure around the opening of the house crawl space where the ducts passed through. My installer left Raleigh very early on the morning of the 14th and is no longer available to do this enclosure. I will have to return to Raleigh for this remaining work which would have been already done had the HVAC unit been delivered as originally scheduled.

20-year-old 14 ton Goodman condenser

I have a 20 year-old Goodman 4 ton condenser and furnace. It was the best investment I ever made reasonable in price and minor repairs of normal failures. My plan if this one goes to have one shipped identical to what I own and try to find a local installation company.

Happy with the product and shipping.

Impressed by the quality

I’ve installed Goodman heat pumps before at a similar price point. This was better quality, and a great deal from the HVAC store. I’m always a little nervous about picking the lowest cost provider but the came through quick and no damage.

I’m in the middle of install so if you don’t see an update, things went well. As I said, first impressions as I opened it up to adjust airflow direction was very impressed!

A good store to shop for HVAC supply

The store did some things I didn't believe the manager was very helpful in fixing my problem

Perfect

Great communication and great price

very reliable company and great prices

Bought a few units from this company and they were very friendly and easy to work with. Either matched prices or beat the price and had fast shipping also.

Excellent company to purchase from

I wasn’t to sure about if this company could deliver it quickly but it arrived within a week. No issues. I needed this one for parts as my first one that I installed a year ago had the ecm go out on the blower fan. Parts are hard to come by for this Chinese brand. I think the ecm went out due to condensation in the main supply plenum dripping onto fan motor. I do like this ac unit but hope the fan lasts longer than a year. I covered the fan ecm with flex seal tape.

Goodman 5 Ton System

Excellent value, customer sales support (a human called to confirm online order... greatly appreciated!), fast shipping. Very happy customer.

A + Company

Great price, communication and service I will be buying another furnace from them Fantastic !

Sale representative Lopez was very experienced and professional. I would recommend this company to any one and I am looking forward to work with Lopez again.