Empire Stove St. Clair 4300 Zero-Clearance Wood Fireplace (WB43FP)
A Large EPA 2020 Certified Zero-Clearance Wood Fireplace with Included Blower for 1,000–2,800 Square Feet
The Empire Stove St. Clair 4300 is a zero-clearance wood-burning fireplace built into new construction or a framed chase, heating 1,000–2,800 ft² with up to 95,000 BTU/h from a 4.28 ft³ firebox behind double cast iron doors, with the blower, one-lever air control, and air wash system included.
Key Features
- Recommended heating area of 1,000–2,800 ft² with up to 95,000 BTU/h maximum heat output
- Meets the EPA 2020 standard with non-catalytic secondary combustion at 1.6 g/h particulate emissions
- 4.28 ft³ firebox accepting logs up to 25" (16" recommended) with up to 11 hours of burn time
- Double glass doors with cast iron frames and a heavy duty double door latch
- Blower included to circulate heated air back into the room
- Simple one-lever air control and air wash system
- 5/16" thick steel top, ceramic refractory lining, and high heat ceramic baffle
- Zero clearance to the enclosure back, sides, and floor; vents with 8" factory-built chimney
- Requires a door overlay, a traditional faceplate, and the classic brick refractory to complete the fireplace, sold separately
Product Features
Zero-Clearance Installation
The St. Clair 4300 installs in a framed enclosure with 0" clearance to the back, sides, and floor of the enclosure, with non-combustible front studs and headers and the space above the fireplace left empty to the required height. It is not approved for mobile home installation and has not been tested for installation inside a masonry chimney. The chimney system, hearth extension, and finishing materials are not included.
Heating Performance for 1,000–2,800 Square Feet
Rated to heat 1,000 to 2,800 ft², the St. Clair 4300 provides up to 95,000 BTU/h of maximum heat output and burns for up to 11 hours on a load of 25" logs, subject to installation and operating conditions.
Included Blower
The included blower, rated up to 176 CFM, increases airflow around the fireplace air jacket and improves hot air circulation in the room. An optional forced air distribution kit can carry heat to another room up to 50 feet away.
EPA 2020 Certified Non-Catalytic Combustion
This non-catalytic fireplace meets the EPA 2020 standard with an average particulate emission rate of 1.6 g/h and includes secondary combustion as a standard feature.
Double Doors, One-Lever Control, and Air Wash
Two glass doors with cast iron frames open on a heavy duty double door latch, a single lever adjusts the burn rate, and the air wash system keeps the 14 1/4" x 12 3/4" per door ceramic glass clear for a full view of the fire.
Durable Steel Construction with Ceramic Refractory
The 5/16" thick steel top is designed for extended heat radiation and lasting durability. High-density ceramic refractory lines the firebox for insulation, and a high heat ceramic baffle is built to perform at high temperatures.
Style Options and Heat Distribution
The St. Clair 4300 is completed with a black or nickel door overlay and the traditional faceplate and classic brick refractory. Optional accessories include the forced air distribution kit, the warm air circulation grill, and a 5" fresh air intake kit.
Configuration and Accessories
Per the Empire Stove 2026 price sheet and installation manual, the St. Clair 4300 includes the blower and requires a door overlay, a traditional faceplate, and the classic brick refractory, which are sold separately.
Included Equipment
| Component |
Details |
| Blower |
Included, up to 176 CFM, installed under the firebox |
Required Components (Sold Separately)
| Component |
Part Number |
Description |
| Door overlay (choose one) |
WD5BL |
Door Overlay, Black |
| Door overlay (choose one) |
WD5NB |
Door Overlay, Nickel |
| Faceplate |
WF5TBL |
Faceplate, Traditional |
| Refractory |
WR5C |
Traditional Refractory |
Optional Accessories (Sold Separately)
| Category |
Part Number |
Description |
| Accessory |
WB2FA |
Kit, Forced Air Distribution |
| Accessory |
WB2WG |
Grill, Warm Air Circulation |
| Fresh air kit |
WA5FP |
Kit, Fresh Air Intake |
Product Specifications
Appliance Performance
| Specification |
Value |
| Fuel Type |
Dry cordwood (16" recommended) |
| Recommended Heating Area |
1,000 – 2,800 ft² |
| Firebox Volume |
4.28 ft³ |
| Maximum Burn Time |
11 h |
| Maximum Heat Output – Dry Cordwood |
95,000 BTU/h |
| Overall Heat Output Rate (Min. to Max.) |
16,610 BTU/h to 43,021 BTU/h (4.9 kW to 12.6 kW) |
| Average Overall Efficiency – Dry Cordwood (HHV) |
63.9% |
| Average Overall Efficiency – Dry Cordwood (LHV) |
68.4% |
| Optimum Overall Efficiency (LHV) |
69.7% |
| Average Particulate Emission Rate |
1.6 g/h (EPA) |
| Average CO Output |
157.4 g/h |
General Features
| Feature |
Specification |
| Combustion Technology |
Non-catalytic |
| Emissions Standard |
Meets EPA 2020 standard |
| Air Control |
Single lever |
| Blower |
Included (up to 176 CFM) |
| Door Type |
Double, glass with cast iron frames |
| Glass Type |
Ceramic glass |
| Glass Viewing Area (W x H) |
14 1/4" x 12 3/4" per door |
| Steel Thickness – Top |
5/16" |
| Log Positioning |
East-west (16" north-south recommended) loading |
| Recommended Log Length |
16" |
| Maximum Log Length |
25" |
| Firebox Lining |
Ceramic refractory panels |
| Baffle Type |
C-Cast |
| Air Wash System |
Yes |
| Warranty |
Empire Limited Lifetime Warranty (see schedule) |
Fireplace Dimensions
| Measurement |
Size |
| Overall Width (Including Standoffs) |
50 3/4" |
| Front Face Width |
45 1/4" |
| Overall Height |
43 3/8" |
| Depth (Framing Depth) |
26 7/8" |
| Overall Depth (Including Front Face) |
32 1/4" |
| Door Opening (Width) |
33" |
| Door Opening (Height) |
12 3/4" |
| Fresh Air Inlet |
5" (bottom of the fireplace) |
| Minimum Gap Between Fireplace and Facing |
1/2" (1 3/8" maximum) |
Dimensions are taken from the Empire Stove St. Clair 4300 spec sheet and installation manual drawings. Shipping weight is not published by Empire Stove.
Minimum Framing Dimensions
| Measurement |
Minimum |
| Framing Width |
50 3/4" |
| Framing Height to First Header |
43 3/8" |
| Framing Depth |
26 7/8" |
| Framing Total Height |
84" |
| Additional Framing Width for Fresh Air Intake Kit |
6" minimum |
| Additional Framing Width for Forced Air Kit |
10" minimum |
Framing dimensions are for reference; if a finishing material is installed inside the enclosure, add its thickness. Front studs and headers above the fireplace must be non-combustible, and the space directly above the fireplace must remain empty to the framing total height.
Venting and Chimney Requirements
| Specification |
Requirement |
| Flue Outlet Diameter |
8" |
| Chimney Diameter |
8" |
| Chimney Type |
CAN/ULC S629, UL 103 HT (2100 °F) factory-built chimney, 1" or 2" solid pack, from the manufacturers listed in the manual |
| Minimum Chimney System Height |
15' for a straight installation |
| Maximum Chimney Weight Supported by the Fireplace |
12' of 1" solid pack or 9' of 2" solid pack |
Listed chimney systems per the installation manual: DuraVent DuraTech, DuraTech Canada, DuraTech Premium and DuraPlus HTC; ICC Excel and RIS; Selkirk Ultra-Temp, SuperVent and SuperPro; Ventis and Nexvent (SBI Venting Division); Olympia Chimney; Secure Temp ASHT+; Metal-Fab Temp Guard. A chimney venting this fireplace must not vent any other appliance.
Certifications and Installation
| Category |
Standard |
| Emissions Standard |
EPA / ASTM WK47329 |
| USA Standard (Safety) |
UL 127 |
| Canadian Standard (Safety) |
ULC S610 |
| Mobile Home Approved |
No |
| Alcove Installation |
Not approved |
| Masonry Chimney Installation |
Not tested; factory-built chimney only |
Minimum Clearances to Combustibles*
| Location |
Minimum Clearance |
| Combustible Material Above the Door Opening (A) |
6" |
| Combustible Side Mantel from the Door Opening (B) |
8" |
| Side Wall from the Door Opening (C) |
24" |
| Wall in Front of the Fireplace |
48" |
| Ceiling from the Base of the Fireplace |
84" |
| Enclosure Back, Sides, and Floor |
0" |
| Chimney |
2" |
Hearth Extension
| Installation Type |
R-Value |
Non-Combustible Floor Protection in Front |
| Directly on the floor |
R 2.00 required |
32" |
| Raised less than 8" from the floor |
R 2.00 required |
32" |
| Raised base of more than 8" |
R 2.00 required |
16" |
| Raised between 8" and 12" from the floor |
R 1.00 required |
20" |
| Raised more than 12" from the floor |
No R-value required |
16" |
The joint between the hearth extension and the fireplace must be protected over the full width by a bent, continuous piece of sheet metal of at least 2" (not included).
*The certification label on the appliance and the current installation manual supersede published dimensions and clearances. Always follow the manufacturer’s installation instructions and applicable local codes. Corner installation, fresh air intake, and forced air kit framing details are specified in the installation manual.
Manufacturer Notes
- Recommended heating area and maximum burn time may vary with location in the home, chimney draft, heat loss factors, climate, fuel type, and other variables.
- Efficiency and emission figures are measured under the applicable certification test methods; see the installation and operation manual for details.
- A door overlay, a traditional faceplate, and the classic brick refractory are required to complete the fireplace and are sold separately.
- Empire is committed to continuous product improvement; specifications may change without notice.
- Any installation must be done according to the data and drawings detailed in the installation and operation manual.
About the Manufacturer
Who Is Empire Stove?
Empire Stove is the wood-burning stove, insert, and fireplace line of Empire Comfort Systems, Inc. of Belleville, Illinois. Its Gateway wood stoves, Archway wood inserts, and St. Clair wood fireplaces are made in North America and share a one-lever air control, a no-mess ash pan, and an air wash system designed for simple everyday operation.
Built to Last
Empire Stove appliances are constructed with thick 5/16" steel, lined with high-density firebricks, and fitted with a high heat ceramic baffle and high temperature ceramic glass, and they are backed by the Empire Limited Lifetime Warranty.
Certification and Support
Current Empire Stove wood-burning models meet the EPA 2020 emissions standard. Empire publishes installation and operation manuals, spec sheets, brochures, and test reports for each model, and supports owners through online product registration and its authorized dealer network.
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