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Onyx 2 HomeHeating + CoolingWood HeatingBuilt-in Wood FireplacesRSF → Onyx 2

Onyx 2

A contemporary design heater

Our customers tell us that the Onyx 2 has the most colorful, dynamic flames they have ever seen, the kind of flames which are impossible to duplicate with gas. The Onyx 2 can provide enough heat for the average house, burn overnight, and look great, all at the same time. Patented RSF technology enables the Onyx 2 to burn so cleanly that it is EPA certified to the same standards as the best freestanding wood stoves.

  • Large 3.1 cubic foot firebox.
  • EPA Phase II certified.
  • Realistic firebrick lining.
  • Mobile home approved.
  • Takes 20″ logs.
  • Can be installed into a masonry chimney using an RSF adapter and a UL/ULC listed stainless steel chimney liner.
  • Can be connected to a central heating system.

This fireplace is certified for use with 7″ ICC Model EXCEL chimney only.

Specifications and Accessories


EPA Certification note ( 6 )
Chimney 7″ Excel
Door Finish Black
Decorative Trims FO-NDTG
Ash Pan FO-CAP
Gravity Vent Kit FO-V2
Gravity Vent Damper FO-D
Electric Wall Thermostat FO-FDHC4
Heat Dump FO-HD
Internal Blower FO-FDHB5-N
Central Heating Blower 635 cfm FO-FDHB6-1
Central Heating Tee FO-T
Zone Heating Option FO-FDHCZ1 & FO-FDHCZ2
Rock Retainer Kit FO-KN
Clean Facing FO-F2 + FO-V2 (2x) ( 7 )
Inline Fan FO-CIF
Gas Log Provision ( 4 ) YES
Masonry Chimney Option FO-FDM7
Firescreen N/A
Outside Air ( 5 ) 4″, meets R2000
Mobile Home Approved YES
Louver or Grill Options Black, Gold Plated or Pewter
Louvers & Decorative Grills


1: Based on overall firebox dimensions, EPA official firebox dimensions are smaller.
2: Actual BTU output depends on many factors, but primarily on the quality of the wood burned.
3: Depends primarily on wood quality, ambient air temperature and building heat loss.
4: These fireplaces may be drilled out to accept an after maret gas log assembly. You may not install a gas lighter in any RSF fireplace because the high firebox temperatures will burn out the log lighter very quickly.
5: 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.
6: The Onyx2 is a non-catalytic EPA appliance certified @ 4.5 grams/hour.
7: N/A on lovered Onyx2

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