Focus 320 SBR, Onyx SBR
Currently certified
EPA lists Focus 320 SBR, Onyx SBR under RSF / Industrial Chimney Company, Incorporated as a currently certified non-catalytic wood stove.
The listed emission rate is 1.4 grams per hour.
The listed HHV efficiency is 66 percent.
Source: EPA Certified Wood Heater Database, snapshot 2026-10-23.
EPA rows
| Field | Row 1 |
|---|---|
| Status | Currently certified |
| Type | Wood Stove |
| Subtype | Non-Catalytic Stove |
| Emission | 1.4 grams per hour |
| HHV efficiency | 66 percent |
| Heat output | 21,131–22,563 BTU/hr |
| Firebox | 2.1 cu ft |
| CO | 1.5 g/min |
| Certified fuel | Crib Wood |
| Test method | Not listed |
| 2020 NSPS | Yes |
Retail names in the model line
These are the names split from EPA's model cell. They are aliases for this line, not separate listings.
- Focus 320 SBR
- Onyx SBR
Other model lines from this manufacturer
- OPEL PLUS Series: Opel+ 2C, Opel+ 3C, Opel+ 4C, Opel+ Keystone, Opel+ Keystone-AK Currently certified
- RSF 3600B Series: Pearl 3600B, Perle 3600B, Focus 3600B, Focus 3600Bi Currently certified
- Delta Fusion Previously certified
- ONYX AP Previously certified
- ONYX, Focus 320 Previously certified
- Opel 2000C, OPEL AP Previously certified
- RSF 3600 Series: Pearl 3600, Perle 3600, Focus 3600, Focus 3600i, Focus 3600s Previously certified
- RSF Focus 320+; Onyx2+ Previously certified
- RSF Opel2C, Opel3C, Opel4C Previously certified
- TOPAZ/CHAEMELON (With Fan), FOCUS 250, PEARL/PERLE Previously certified
- TOPAZ/CHAMELEON (Without Fan), FOCUS 250, PEARL/PERLE Previously certified
Nearest model lines by EPA figures
Nearest means the smallest absolute difference on that EPA figure, among other Wood Stove model lines that list it. Ties are ordered by model name.
Emission
- 38SFC_D_II and 38ST_D_II Series: Elegance ST 42 II, Astra Duo 38 II, Monarch See-Through 38 II, Wayland See-Through 38 II, Novo Duo 38 II – Cast Iron, Novo Duo 38 II – Soapstone — 1.4 grams per hour
- Answer NexGen Hybrid — 1.4 grams per hour
- Brenden BR-60 — 1.4 grams per hour
- Catalytic Fireview Soapstone Stove #205 — 1.4 grams per hour
- Dutchwest Large Convection Heater 2461 — 1.4 grams per hour
HHV efficiency
- 16 IN Model Line: Lumis 16 (16 IN), Flair 25 (16 IN), Regal 16 (16IN) — 66 percent
- Everest II Series HE300 II, HE325, Everest II, St. Clair 3000 — 66 percent
- F370 — 66 percent
- Flair 34, Lumis 32 - Cast Iron, Lumis 32 - Soapstone, Regal 32 - Soapstone, Regal 32 - Cast Iron — 66 percent
- Kozy Heat Z42, Kozy Heat Albany — 66 percent
Heat output
- Efel Symphony 390.74 — 10,700–33,000 BTU/hr
- Efel Symphony 390.74 — 10,700–33,000 BTU/hr
- Quadra-Fire 1900 — 11,500–32,200 BTU/hr
- Trailblazer Classic 1300/1306 — 11,300–32,400 BTU/hr
- 113-NCI, 50-TNC13I, 50-SNC13I (Insert) — 11,600–32,000 BTU/hr
RSF / Industrial Chimney Company, Incorporated hub · EPA Certified Wood Heater Database