ONYX, Focus 320
Previously certified
EPA lists ONYX, Focus 320 under RSF / Industrial Chimney Company, Incorporated as a previously certified non-catalytic wood stove.
The listed emission rate is 4.5 grams per hour.
EPA does not list an HHV efficiency for this model line.
Source: EPA Certified Wood Heater Database, snapshot 2026-10-23.
EPA rows
| Field | Row 1 |
|---|---|
| Status | Previously certified |
| Type | Wood Stove |
| Subtype | Non-Catalytic Stove |
| Emission | 4.5 grams per hour |
| HHV efficiency | Not listed |
| Heat output | 11,800–35,600 BTU/hr |
| Firebox | Not listed |
| CO | Not listed |
| Certified fuel | Crib Wood |
| Test method | Not listed |
| 2020 NSPS | No |
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.
- ONYX
- Focus 320
Other model lines from this manufacturer
- Focus 320 SBR, Onyx SBR Currently certified
- 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
- 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
- 2800HT — 4.5 grams per hour
- 3.1 Series (NG-1800) — 4.5 grams per hour
- 8140, 8142, 8143, 8145, 8147, 8150, 8151, and 8190 — 4.5 grams per hour
- Atlanta K02, Siena, Monza, Davos, Ravenna, Heidelberg — 4.5 grams per hour
- C550 CB — 4.5 grams per hour
HHV efficiency
EPA does not list an HHV efficiency to compare, or no other line lists one.
Heat output
- 1600 B-I/Ashley 4600/Forester 4700 — 11,900–35,500 BTU/hr
- Arrow 55 — 9,900–37,500 BTU/hr
- Cricket 5300 — 11,000–36,400 BTU/hr
- Durango TR001 and TR002 — 11,300–36,100 BTU/hr
- E-1/90 — 9,600–37,800 BTU/hr
RSF / Industrial Chimney Company, Incorporated hub · EPA Certified Wood Heater Database