Coming in 2023!
FOCUS 3600i 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”)


Documents and Specs

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


Low Heating Value (LHV) using CSA B415.1-10 calculations.

EPA Average Efficiency


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


an exceptional warranty

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