Using technology exclusive to RSF Fireplaces, the Fusion has the first fully automatic fireplace air damper. Now, you have nothing to adjust other than the size of your wood load. Winner of the Hearth & Home 2016 Vesta Award, the Delta Fusion is the newest member of the RSF fireplace family.

Whether you are new to wood burning or have a lifetime of experience, you will appreciate how the Fusion automatically maintains a gorgeous, environmentally friendly fire while heating upwards of 3,000 square feet. Its innovative bimetallic air damper automatically regulates combustion, keeping the stove burning in a “sweet spot” which produces both minimal emissions and a visually striking fire. The low 1.3 grams per hour emissions is virtually unheard of in a heating appliance. The cleanest fires are achieved with lots of secondary combustion which is when the fire is most visually appealing.

  • This fireplace is certified for use with 8″ ICC Model EXCEL chimney only.
  • Large 4.4 cubic foot firebox which holds 24” logs with ease
  • RSF exclusive bimetallic air damper continuously regulates combustion supply
  • Heats upwards of 3,000 square feet
  • Non-catalytic
  • EPA certified to burn as clean as 1.3 grams per hour


Comfort is our specialty. We customize heat distribution from a wood fireplace throughout the home, including the basement. When the household temperature is tailored for a family at minimal cost and maximum efficiency, we call that the RSF Comfort Advantage.

Note: the central heating option is not available for the Pearl 3600, the Focus 3600 or Focus ST.

Available Options

Masonry Chimney Adapter

This adapter will attach to the liner with 3 stainless steel rivets (provided) and to the EXCEL chimney with 3 screws (provided).


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Documents and Specs

Delta Fusion

Note: The installation manual should always be used for the precise planning and accurate installation of your fireplace.

Outside Dimensions 47 1/8″W X 44 3/8″H X 25 1/4″D
Shipping weight 647 lb
Glass viewing size 20″ W x 15″ H (center glass) 7″ W x 12 ½” H (side glass)
Firebox Size 4.4 cubic feet

Based on overall firebox dimensions, EPA official firebox dimensions are smaller.

Firewood Length 24″
BTU Output Range 40 000 to 95 000 BTU/h with an average of 70 000BTU/h

Actual BTU output depends on many factors, but primarily on the quality of the wood burned.

Heating Capacity 3,000 ft2

Depends primarily on wood quality, ambient air temperature and building heat loss.

Chimney 8″ Excel
Door Finish Black
Outside Air 4″, meets R2000

All RSF models come equipped to accept a 4″ outside air duct, a 5″ can also be used. All models can also be installed to operate using room air.

Mobile Home Approved NO
EPA Certified 1.3 g/hr
Optimal Efficiency 66%

Low Heating Value (LHV), using data generated under the best circumstances and CSA B415.1-10 calculations.

EPA Average Efficiency 60.35%

High Heating Value (HHV), using data from EPA crib wood testing and CSA B415.1-10 calculations.

EPA Average CO 148.50

Carbon Monoxide (CO), using data from EPA crib wood testing.

Specs and CAD
Owner’s Manuals – Fireplaces
U.S. EPA Certificate
Exploded view


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