RSF Focus 3600i Wood Insert

RSF 3600i Wood Insert


Introducing a new chapter for the RSF brand. The Focus 3600i is the very first fireplace insert developed by RSF. Its quality construction, low emissions, and high efficiency embody over 30 years of quality fireplace construction and experience. 

  • Clean, modern styling
  • Easy to install
  • Certified to NSPS 2020 at 1.4 g/hr
  • Heat activated internal blower
  • Detachable flue collar with pull handle
  • Optional oversize backing plate (42” x 30”)


Focus 3600i Insert
Note: The installation manual should always be used for the precise planning and accurate installation of your fireplace.
Firebox Size 2.1 cu ft Based on overall firebox dimensions, EPA firebox volume per certification testing is 1.6 cubic feet.
Firewood Length EPA tested with 12″ & 16″ logs, can accept up to 18″ logs
EPA Certification 1.49g/h
BTU Output 44,135 BTU/h Based on EPA certification testing using cordwood and calculations from CSA B415.1-10
BTU Maximum 50,000 BTU/h Based on engineering calculations using firebox volume, efficiency, loading density (12lb/cu ft for hardwood), average humidity, reloading interval, type of installation, etc.
Heating Capacity 800 to 1,500 ft2 Depends primarily on wood quality, ambient air temperature and building heat loss.
Optimal Efficiency 79% Low Heating Value (LHV) using CSA B415.1-10 calculations.
EPA Average Efficiency 74% High Heating Value (HHV) using CSA B415.1-10 calculations.
EPA Average CO 1.29 g/min Carbon Monoxide (CO), using data from EPA crib wood testing


Owners Manual