RSF / Industrial Chimney Company, Incorporated Focus 320 SBR
RSF / Industrial Chimney Company, Incorporated Focus 320 SBR is a non-catalytic wood stove from RSF / Industrial Chimney Company, Incorporated certified at 1.4 g/hr particulate emissions with 66% HHV efficiency and a 21,131–22,563 BTU/h output range.
| Appliance type | wood-stove |
|---|---|
| Combustion technology | Non-Catalytic Stove |
| Certified fuel | Crib Wood |
| Covered model numbers | Focus 320 SBR, Onyx SBR |
| Emission rate | 1.4 g/hr |
|---|---|
| Carbon monoxide | 1.5 g/min |
| Efficiency (HHV) | 66 % |
|---|
| Heat output (low) | 21131 BTU/h |
|---|---|
| Heat output (high) | 22563 BTU/h |
| Firebox volume | 2.1 cu ft |
| 25C tax credit eligible (≥75% HHV) | No |
|---|---|
| 2020 NSPS compliant | Yes |
| Currently in production | Yes |
| EPA certification number | 94-17 |
What space does the RSF / Industrial Chimney Company, Incorporated Focus 320 SBR suit?
- Its 22,563 BTU/h peak output covers roughly 650–900 sq ft at the 25–35 BTU/h-per-square-foot rule of thumb — see the sizing calculator to adjust for your insulation and climate.
- The 2.1 cu ft firebox puts it in the mid-size home class.
- Rough fuel use: about 1.8 cords per season at the midpoint of its output range (8 burn-hours/day, 150-day season, 22 MMBtu/cord — see methodology).
- Certified burning Crib Wood .
Similar wood stoves
- Foyers Supreme Fusion 18 18FN (1.9 g/hr)
- STUV AMERICA STUV SIX 76-55 (1.86 g/hr)
- Innovative Hearth Products Ladera CAT WRT3920WS (1.8 g/hr)
- Rais A/S Viva 100 L (CA) USA (1.1 g/hr)
- Pacific Energy Fireplace Products Limited Vista LE (1.9 g/hr)
- J. A. Roby Polaris (1.4 g/hr)
Frequently asked questions
Is the RSF / Industrial Chimney Company, Incorporated Focus 320 SBR EPA certified?
Yes, the RSF / Industrial Chimney Company, Incorporated Focus 320 SBR is on the EPA's current list of certified wood heaters (certification number 94-17) and meets the 2020 NSPS Step 2 emission limits.
What is the RSF / Industrial Chimney Company, Incorporated Focus 320 SBR's emission rate?
The RSF / Industrial Chimney Company, Incorporated Focus 320 SBR is certified at 1.4 grams of particulates per hour (tested with crib wood). Real-world emissions depend heavily on fuel moisture and operation — the lab figure assumes seasoned fuel and correct air settings.
How many square feet can the RSF / Industrial Chimney Company, Incorporated Focus 320 SBR heat?
Roughly 650–900 sq ft, estimated from its 22,563 BTU/h peak output at 25–35 BTU/h per square foot. Insulation, climate, ceiling height, and floor plan move this figure substantially in both directions.
Does the RSF / Industrial Chimney Company, Incorporated Focus 320 SBR qualify for a federal tax credit?
No — the federal 25C credit for biomass stoves was terminated for property placed in service after December 31, 2025. The RSF / Industrial Chimney Company, Incorporated Focus 320 SBR's certified efficiency is 66% HHV, which did not meet the credit's ≥75% HHV threshold while it existed. State and local incentive programs may still apply — check your state energy office and air district.
Sources
- cfpub.epa.gov (retrieved 2026-07-23)