This LCN 4021 closer mounts on the push side top jamb with left-hand configuration. It controls door swing speed and ensures reliable closing for medium to heavy-duty commercial applications where consistent operation matters for code compliance.
The cast iron body houses a double heat treated steel pinion and forged steel main arm for long-term durability. All weather fluid maintains performance across temperature ranges. Spring size adjusts from 1 through 5 to match door weight and width requirements.
Thru-bolt mounting with TBSRT hardware provides secure attachment to hollow metal or wood frames. The aluminum finish resists corrosion in exterior applications. Peel and stick templates speed installation layout.
| Series | 4020 Series |
|---|---|
| ANSI Grade | Grade 1 |
| Mounting | Push Side Top Jamb |
| Handing | Left Hand |
| Finish | 689 Aluminum |
| Spring Size | Adjustable 1-5 |
Meets ANSI/BHMA A156.4 Grade 1 requirements and carries UL listing for fire-rated door assemblies.
Selecting the right spring size depends on door dimensions and weight - reference the door closer selection guide for proper sizing. For applications requiring fire door compliance, see ANSI A156.4 door closer standards covering Grade 1 performance criteria.