Name: LCN 4020-3049FL Fusible Link Hold Open Arm for Door Closers with 165°F Temperature Release
Brand: LCN
SKU: 4020-3049FL RH 689
Price: 283.77 USD
Availability: InStock

Product Overview
FAQs

LCN Fusible Link Hold Open Arm for 4020 Series Door Closers with 165°F Temperature Release

Fire Safety Hold Open Arm with Automatic Temperature Release

The LCN Fusible Link Hold Open Arm provides automatic fire safety compliance for 4020 Series door closers by releasing the hold open function when exposed to temperatures above 165°F. This handed replacement component features a 3 7/8" (98 mm) maximum reveal and adjustable positioning at the shoe for precise installation requirements. Designed specifically for commercial applications requiring fire code compliance with automatic door closure during emergency conditions.

Professional Features & Benefits

Temperature-Activated Release: Automatically releases hold open function at 165°F for fire safety compliance and emergency egress requirements.
Precise Dimensional Specifications: 3 7/8" (98 mm) maximum reveal provides accurate clearance measurements for proper door closer integration.
Adjustable Shoe Positioning: Field-adjustable at shoe location allows fine-tuning for optimal door alignment and operation.
4020 Series Compatibility: Engineered specifically for LCN 4020 Series door closers ensuring perfect fit and reliable operation.
Handed Configuration: Available in handed versions to accommodate specific door swing requirements and installation constraints.
ADA Compliant Design: Meets ADA accessibility requirements for commercial door hardware applications.
Commercial-Grade Construction: Built for demanding commercial environments with reliable fire safety performance.

Technical Specifications

ADA Compliant: Yes
Commercial/Residential: Commercial
Department: Door Hardware
Parts and Accessories Type: Replacement Parts
Product Attribute: Parts and Accessories
Product Category: Door Controls
Product Group: Door Controls
Product Model: 4020-3049
Product Subgroup: Parts and Accessories
Product Type: Hold Open Arm
Series: 4020 Series
Subcategory: Parts and Accessories

Professional Applications

Commercial Office Buildings
Educational Facilities
Healthcare Institutions
Retail Establishments
Industrial and Warehouse Facilities
Multi-Tenant Residential Properties
Government and Municipal Buildings

Why Choose LCN Quality?

LCN fusible link arms deliver professional-grade fire safety compliance with precision-engineered temperature release mechanisms rated for 165°F activation. ADA compliant design ensures accessibility requirements are met while providing reliable automatic door closure during emergency conditions. Engineered for demanding commercial applications where dependable fire safety performance is essential.

Manufacturer Resources

LCN Full Line Catalog

Product Specs

Series:: 4020 Series
Subcategory:: Parts and Accessories
Product Group:: Door Controls
Product Subgroup:: Parts and Accessories
Product Type:: Door Closer Arms
Commercial/Residential:: Commercial
ADA Compliant:: Yes
Parts and Accessories Type:: Replacement Parts
Product Attribute:: Parts and Accessories
Product Model:: 4020-3049
Product Category:: Door Controls
Department:: Door Hardware

LCN 4020-3049FL RH 689 – Frequently Asked Questions

1) Will the LCN 4020-3049FL fusible link arm work on my 4020 Series closer?

The 4020-3049FL fusible link hold open arm is built for LCN 4020 Series door closers specifically. It is a replacement arm assembly, so it swaps onto an existing 4020 closer body rather than being a closer itself. If the closer on the door is a different LCN series, this arm is not the part.

2) Do I need to order the LCN fusible link hold open arm left hand or right hand?

Handing matters on this one. The 4020-3049FL is a handed arm, ordered LH or RH, and there is no reversible version. Stand outside the door (the side it swings away from): hinges on your left is left hand, hinges on your right is right hand. Order the hand that matches the opening, because the wrong hand will not mount correctly.

3) How much reveal can the LCN 4020-3049FL hold open arm handle?

Maximum reveal is 3 7/8 inches (98 mm). Measure from the face of the door to the face of the stop or frame where the closer shoe lands. Anything deeper than 3 7/8 inches and this arm will not reach; you need a different arm or a bracket to bring the mounting point out. The shoe is adjustable, so within that range you can fine tune the position at install.

4) What does a fusible link arm actually do in a fire, and do I need one instead of a plain hold open arm?

A fusible link arm holds the door open during normal use and drops the hold open automatically when the air at the arm reaches 165 degrees F, letting the closer shut and latch the door. That is the point of it: a door that is propped open on a regular hold open arm stays open in a fire. If the opening is a corridor or stair door that has to close on a fire condition and there is no magnetic hold open tied to the alarm, this is the arm to use. If the door has no fire duty and you just want it to stand open, a standard hold open arm does the job.

5) My closer is a Sargent or Falcon, not an LCN. What hold open arm do I use?

Closer arms are not interchangeable across brands, so the LCN 4020-3049FL will not fit a Sargent or Falcon body. For Sargent 351 or 281 closers, the 25-H hold open arm covers standard and top jamb mount, and the 25-CPSH is the hold open parallel arm version with a compression stop built in. On the Falcon side, the SC60A-3049DS is a hold open dead stop parallel arm assembly and the SC70A-3049/PA is a hold open arm with the PA bracket for SC70A closers. Match the arm to the closer series stamped on the body.

6) Can I retrofit a fusible link hold open onto an LCN 4020 closer that has a regular arm on it now?

Yes. The 4020-3049FL is sold as a replacement arm for 4020 Series closers, so an existing 4020 with a standard or regular hold open arm can be converted by changing the arm assembly. You keep the closer body and the existing mounting on the door. What you have to get right on the order is the hand (LH or RH), the finish to match the closer cover, and a reveal at the opening no greater than 3 7/8 inches.

7) What is the Falcon equivalent of the LCN 4020-3049FL hold open arm?

The closest Falcon parallel is the SC70A-3049/PA, a hold open arm with PA bracket built for Falcon SC70A Series door closers. Both are hold open arms sold as a closer arm assembly rather than a complete closer, but they are series-specific parts: the LCN 4020-3049FL is engineered for the LCN 4020 Series, and the Falcon SC70A-3049/PA is engineered for the SC70A Series. Match the arm to the closer body already hung on the door, and note that the LCN arm adds a 165 degree F fusible link that drops the hold open on a temperature rise.

8) What hold open arm should I use if I also need the door to dead stop at the open position?

The Falcon SC60A-3049DS is a hold open dead stop parallel arm assembly, so the stop function is built into the arm itself for SC60A Series closers. The LCN 4020-3049FL is a fusible link hold open arm for the 4020 Series; its release is temperature-driven at 165 degree F rather than a mechanical stop at a set degree of swing. If the opening needs the arm to stop the door as well as hold it, the dead stop assembly is the one that does both.

9) Is the LCN 4020-3049FL arm ADA compliant for a commercial opening?

Yes, the 4020-3049FL is listed ADA compliant and is a commercial grade component, which is what you want on office, school, healthcare, and government openings. Note that ADA opening force on a door is mostly set by the closer's spring adjustment and the opening geometry, not by the arm alone, so the closer still has to be adjusted to meet the force requirement after the arm goes on.

10) I want the door to hold open and also stop at a set point so it does not hit the wall. Is the fusible link arm the right choice?

The 4020-3049FL gives you hold open with a thermal release, but it is not a stop arm. If the opening also needs the door stopped short of a wall or a backcheck point built into the arm, look at a dead stop or compression stop arm instead: the Falcon SC60A-3049DS is a hold open dead stop parallel arm, and the Sargent 25-CPSH combines hold open with a compression stop. Those are different closer platforms, though, so the closer body has to match. On an LCN 4020, a separate wall or floor stop is the way to protect the wall.

11) Is a 165 degree F fusible link the right temperature rating for a corridor door?

165 degrees F is the standard release temperature for fusible link hold open devices on ordinary occupied spaces, which covers corridors, offices, classrooms, and patient areas. That is the rating on the 4020-3049FL arm. Higher release temperatures exist for rooms that run hot in normal use, such as kitchens, boiler rooms, and some laundry or mechanical spaces, where a 165 degree link could drop the door during normal operation. For a standard conditioned corridor, 165 is the one you want.

12) Is the Sargent 25-H a substitute for the LCN 4020-3049FL?

No. The Sargent 25-H is a hold open door closer arm for Sargent 351 and 281 closers in standard and top jamb mount, so it fits Sargent closer bodies, not LCN 4020 Series bodies. The LCN 4020-3049FL is the 4020 Series hold open arm and carries the 165 degree F fusible link release. The two are hold open arms for different closer platforms; replacing an LCN 4020 arm means staying with the LCN part.

13) I need a hold open arm with a compression stop for a Sargent closer - what are my options?

Sargent offers the 25-CPSH, a heavy duty hold open parallel arm with compression stop for 351 and 281 door closers, rated Grade 1. The non-hold-open counterpart is the 25-CPS, a heavy duty Grade 1 parallel arm door closer with compression stop for the same 351 and 281 bodies. Choose the CPSH when the door needs to stand open and the CPS when it should only be stopped. Neither takes the place of the LCN 4020-3049FL, which is the fusible link hold open arm for LCN 4020 Series closers.

14) Can I order a complete closer instead of just the hold open arm?

Yes, if the opening is getting new hardware rather than a repair. The Sargent 1431-CPS TB EN is a complete heavy duty surface door closer with parallel arm and compression stop, Grade 1, so the body and arm arrive together. The LCN 4020-3049FL is a replacement part - the hold open arm alone for an LCN 4020 Series closer already on the door. For a door where only the arm has failed, the arm is the part to order; for a fresh opening with no closer, the complete unit covers it.

15) What finishes does the LCN fusible link hold open arm come in?

Six finishes: 689 aluminum, 690 statuary bronze, 691 light bronze, 693 gloss black, 695 dark bronze, and 696 brass. Every one of the six is available in both left hand and right hand, so you can match the arm to the closer cover and the rest of the door hardware without giving up the hand you need. For a fleet of openings, 689 aluminum and 695 dark bronze are the two that usually match existing LCN closers already in the building.

16) Can the hold open point be adjusted after the LCN 4020-3049FL arm is installed?

The arm is adjustable at the shoe, so the installer can fine tune the position and the resulting hold open angle on site rather than being locked into one setting by the drilling. That matters on a retrofit where the existing closer holes are already in the door and the reveal is near the 3 7/8 inch limit.

17) What is the difference between a fusible link hold open arm and a standard arm with track?

The Falcon 8230-3077PLCM is a standard arm with track for 8230 Series automatic door operators, in the 8200 Series - a track arm that carries the door through a slide channel on an operator. The LCN 4020-3049FL is a fusible link hold open arm for 4020 Series manual door closers, handed, with a 3 7/8 inch (98 mm) maximum reveal and adjustment at the shoe. A track arm and a hold open arm solve different jobs: one is the drive linkage for an operator, the other holds a door open until 165 degree F releases it.

18) Does the Falcon OHC100A-DP work in place of an LCN 4020 series arm?

No. The Falcon OHC100A-DP is a center hung floor pivot with end load arm for OHC100A Series door closers, so it belongs to a center hung floor closer arrangement. The LCN 4020-3049FL is a surface closer hold open arm for LCN 4020 Series units, handed left or right and adjustable at the shoe. A center hung pivot assembly and a surface closer arm mount to different points on the opening and are not interchangeable.

How fast can I get the LCN 4020-3049FL RH 689 delivered?

Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.

Can I return it if it doesn’t work for me?

Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.

Does the LCN 4020-3049FL RH 689 come with a warranty?

Absolutely. The LCN 4020-3049FL RH 689 is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.

How do I get technical support or installation help for the LCN 4020-3049FL RH 689?

You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us

Why buy the LCN 4020-3049FL RH 689 from ZenSupply?

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LCN 4020-3049FL Fusible Link Hold Open Arm for Door Closers with 165°F Temperature Release

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