Osburn Stratford II Zero-Clearance Wood Fireplace
Osburn Stratford II Wood Fireplace OB04007 – EPA-Certified Zero-Clearance Wood Fireplace
The Osburn Stratford II Wood Fireplace OB04007 is an EPA 2020-certified, non-catalytic zero-clearance wood-burning fireplace designed for residential zone heating. It offers a recommended heating area of 750 to 2,200 sq. ft., a 2.5 cu. ft. firebox, capacity for logs up to 20 inches, a maximum dry-cordwood heat output of 80,000 BTU/h, and an included blower rated at up to 176 CFM.
Model
OB04007
Product Type
Zero-Clearance Fireplace
Heating Area
750–2,200 sq. ft.
Max Output
80,000 BTU/h
Firebox
2.5 cu. ft.
Max Burn Time
8 Hours
Max Log Length
20"
Blower
Up to 176 CFM
Required Components to Complete Installation
The Stratford II requires a compatible faceplate, door overlay, and 6-inch anchor plate for connection to the chimney system. These components must be selected as required for the installation.
Built-In Wood Fireplace Performance with Modern EPA Certification
The Stratford II is designed for homeowners who want the appearance and experience of a traditional built-in wood fireplace with the combustion performance of a modern EPA-certified appliance.
Its non-catalytic combustion system uses a stainless-steel secondary-air system, C-Cast or equivalent baffle, moulded refractory components, ceramic-glass doors, and cast-iron andirons to support efficient dry-cordwood operation.
The included 176 CFM blower helps circulate heated air into the living area, while the double cast-iron-framed glass doors provide a broad view of the fire.
Zone-heating application: The Stratford II is intended primarily to heat the room where it is installed and connected spaces to a lesser degree.
Osburn Stratford II OB04007 at a Glance
Product Type
Zero-Clearance Wood-Burning Fireplace
Heating Area
750–2,200 sq. ft.
Maximum Output
80,000 BTU/h
Firebox Volume
2.5 cu. ft.
Maximum Burn Time
8 Hours
Blower
Included, Up to 176 CFM
Is the Osburn Stratford II Right for Your Home?
Best For
- Residential built-in wood-fireplace projects.
- Buyers wanting a zero-clearance fireplace.
- Recommended heating areas from 750–2,200 sq. ft.
- Homeowners wanting non-catalytic combustion.
- Projects using a compatible 6-inch chimney system.
- Buyers wanting double cast-iron-framed glass doors.
- Buyers wanting an included blower up to 176 CFM.
- Projects requiring Traditional or Prairie faceplate styling.
- Users wanting logs up to 20 inches long.
Consider Another Fireplace If
- You need a mobile-home or manufactured-home-approved fireplace.
- Your project cannot accommodate the documented framing dimensions.
- Your chimney design cannot satisfy the required chimney system.
- You cannot provide the required hearth extension.
- You cannot maintain the required combustible clearances.
- You want a masonry fireplace insert rather than a built-in zero-clearance fireplace.
Heating Performance & Efficiency
| Recommended Heating Area |
750–2,200 sq. ft. |
| Maximum Heat Output |
80,000 BTU/h (23.4 kW) |
| Overall Heat Output Rate |
12,700–60,700 BTU/h (3.72–17.79 kW) |
| Overall Firebox Volume |
2.5 cu. ft. |
| EPA Loading Volume |
1.94 cu. ft. |
| Maximum Burn Time |
Up to 8 Hours |
| Average Overall Efficiency – HHV |
64% |
| Average Overall Efficiency – LHV |
68% |
| Optimum Overall Efficiency |
70% |
| Optimum Heat Transfer Efficiency |
68% |
| Average Particulate Emissions |
1.2 g/h |
| Average CO |
98 g/h |
Performance distinction: The 80,000 BTU/h figure is the listed maximum dry-cordwood output. The separately documented overall heat-output range is 12,700–60,700 BTU/h.
Key Features
EPA 2020 Certified
Designed to comply with the current cordwood emissions standard.
Non-Catalytic Combustion
Provides modern secondary combustion without a catalytic combustor.
2.5 cu. ft. Firebox
Provides useful capacity for residential zone heating.
20" Maximum Log Length
Accepts logs up to 20 inches, with 16-inch cordwood recommended.
8-Hour Maximum Burn Time
Actual burn time varies with fuel, draft, climate, heat demand, and operating conditions.
176 CFM Blower
Included blower helps circulate heated air into the living space.
Double Glass Doors
Ceramic glass with cast-iron frames provides a broad viewing area.
Secondary-Air System
Stainless-steel secondary-air components support non-catalytic combustion.
Moulded Refractory Components
Designed for the high temperatures generated within the firebox.
Wood Fuel Requirements
The Stratford II is designed to burn seasoned natural firewood.
| Fuel Type |
Dry Cordwood |
| Recommended Log Length |
16" |
| Maximum Log Length |
20" |
| Recommended Log Orientation |
East-West |
| Recommended Moisture Content |
Approximately 15%–20% |
Using properly seasoned wood helps support efficient combustion, cleaner glass, reduced smoke, and slower creosote accumulation.
Fuel quality matters: Continually burning green or unseasoned wood can reduce heat output, increase smoke, dirty the glass, and accelerate creosote formation.
Required Front Components
Faceplate
- Traditional Style Faceplate
- Prairie Style Faceplate
Chimney Connection
A compatible 6-inch anchor plate is required to connect the fireplace to the chimney system.
Required to complete the installation: Select a compatible faceplate, door overlay, and 6-inch anchor plate.
Traditional vs. Prairie Faceplate Styling
Traditional Style
Provides a more classic appearance with horizontal louver detailing above and below the fireplace opening.
Prairie Style
Provides a more geometric grille treatment for a contemporary architectural appearance.
Finish protection: The plated surface of the faceplate should not contact mortar, acid, or other masonry products containing abrasives because these materials can damage or discolor the finish.
Overall Dimensions & Construction
| Overall Width |
36 3/4" |
| Overall Height |
40 5/8" |
| Overall Depth |
29 3/4" |
| Door Opening |
25 3/8" W × 10 1/2" H |
| Firebox Dimensions |
20 3/8" W × 12 1/8" H × 12 7/8" D |
| Door Type |
Double Glass Doors with Cast-Iron Frame |
| Glass Type |
Ceramic Glass |
| Blower |
Included, Up to 176 CFM |
| Baffle |
C-Cast or Equivalent |
| Moulded Refractory Components |
Yes |
| Secondary-Air System |
Stainless Steel |
| Cast-Iron Andirons |
Yes |
| Shipping Weight |
468 lb. (212 kg) |
Reference Framing Dimensions
The Stratford II is a built-in zero-clearance fireplace and requires an appropriately planned enclosure.
| Framing Width |
37 3/4" |
| Height to First Header |
41 5/8" |
| Framing Depth |
24 7/8" |
| Total Framing Height |
80" |
Reference dimensions only: Finishing-material thickness and optional fresh-air or heat-distribution configurations can change enclosure requirements. Use the full installation documentation before construction.
Chimney & Venting Requirements
Chimney Type
CAN/ULC S629 or UL 103 HT (2100°F)
Minimum Chimney Height
15 ft. from appliance base to chimney cap under qualifying conditions
Chimney Clearance
2" to combustibles
Chimney-system planning: The fireplace installation instructions and the chimney manufacturer's instructions both apply to the complete system.
Minimum Clearances to Combustibles
| Minimum Ceiling Height |
80" measured from the base of the fireplace |
| Combustible Side Mantel |
8" minimum from the door opening |
| Side Wall |
13" minimum from the door opening |
| Wall in Front of Fireplace |
48" minimum |
| Fireplace Enclosure – Back |
0" |
| Fireplace Enclosure – Sides |
0" |
| Floor Under Fireplace |
0" |
| Chimney to Combustibles |
2" |
Certification label priority: Always follow the certification label affixed to the fireplace and the current manufacturer installation instructions when finalizing clearances.
Hearth Extension Requirements
Floor Level or Raised 4" or Less
- Minimum front extension: 16"
- Minimum side extension: 8" on each side of door opening
- Required thermal resistance: R-value 1.00
Raised More Than 4"
- Minimum front extension: 16"
- Minimum side extension: 8" on each side of door opening
- Manufacturer documentation indicates an R-value is not required for this specific configuration
Hearth construction depends on installation height. Follow the exact hearth-extension instructions for the final fireplace configuration.
Optional Heat Distribution & Fresh-Air Configurations
Fresh Air Intake
Can be installed through the right side or underneath the fireplace according to the manufacturer instructions.
Traditional Gravity Hot Air Kit
Uses two gravity-fed hot-air outlets.
Modern Gravity Hot Air Kit
Provides an alternate visual approach to gravity heat distribution.
Forced Air Distribution Kit
Can distribute heat to another room and may connect on either side of the fireplace.
Preferred Forced-Air Connection
The manufacturer identifies the left side as preferred for better performance.
Optional Fire Screen
Use is addressed in the fireplace manual and is subject to operating and emissions restrictions.
Do not connect gravity hot-air ducts to a central heating system. Optional distribution systems must be installed according to their dedicated instructions.
Operating & Safety Considerations
Burn Seasoned Firewood
Use only natural firewood permitted by the manufacturer's instructions.
Keep Air Openings Clear
Do not obstruct fireplace air inlets or hot-air vents.
Operate Doors Correctly
Operate with doors fully closed except where specifically permitted with an approved fire screen.
Inspect Components
Do not operate with broken glass, firebrick, refractory parts, or baffle components.
Use Safety Devices
Install smoke and carbon-monoxide detectors and keep a fire extinguisher available.
Do Not Modify the Fireplace
Do not combine non-approved components or modify the appliance.
First-Fire Considerations
During the first several fires, paint and internal components cure and condition. Odors can occur during this process.
The manufacturer recommends beginning with two or three smaller fires and ventilating the home before progressing to larger and hotter fires.
Maintenance Considerations
Refractory panels, baffle components, secondary-air tubes, door seals, and glass should be periodically inspected.
The chimney should also be checked regularly for creosote accumulation. The supplied manual states that the chimney should be cleaned and inspected at least once each year, with inspection frequency increased as operating conditions require.
Always allow the fireplace to cool before cleaning the glass. Avoid abrasive products on the ceramic glass, and do not operate the fireplace with broken glass.
Certifications & Standards
U.S. Emissions
EPA 2020 Cordwood Standard
Canadian Emissions
CSA B415.1-10
U.S. Safety Standard
UL 127
Canadian Safety Standard
ULC S610
Testing
Safety tested by an accredited laboratory
Warranty
Limited Lifetime
Complete Osburn Stratford II OB04007 Specifications
| Brand |
Osburn |
| Model |
Stratford II |
| Model Number |
OB04007 |
| Product Type |
Zero-Clearance Wood-Burning Fireplace |
| Fuel |
Dry Cordwood |
| Combustion Technology |
Non-Catalytic |
| EPA Status |
EPA 2020 Cordwood Standard |
| Recommended Heating Area |
750–2,200 sq. ft. |
| Overall Firebox Volume |
2.5 cu. ft. |
| EPA Loading Volume |
1.94 cu. ft. |
| Maximum Burn Time |
8 Hours |
| Maximum Heat Output |
80,000 BTU/h (23.4 kW) |
| Overall Heat Output Rate |
12,700–60,700 BTU/h (3.72–17.79 kW) |
| Average Overall Efficiency |
64% HHV / 68% LHV |
| Optimum Overall Efficiency |
70% |
| Optimum Heat Transfer Efficiency |
68% |
| Average Particulate Emissions |
1.2 g/h |
| Average CO |
98 g/h |
| Recommended Log Length |
16" |
| Maximum Log Length |
20" |
| Recommended Log Orientation |
East-West |
| Overall Width |
36 3/4" |
| Overall Height |
40 5/8" |
| Overall Depth |
29 3/4" |
| Door Opening |
25 3/8" W × 10 1/2" H |
| Firebox Dimensions |
20 3/8" W × 12 1/8" H × 12 7/8" D |
| Door Type |
Double Glass Doors with Cast-Iron Frame |
| Glass Type |
Ceramic Glass |
| Blower |
Included – Up to 176 CFM |
| Baffle Material |
C-Cast or Equivalent |
| Moulded Refractory Components |
Yes |
| Secondary-Air System |
Stainless Steel |
| Cast-Iron Andirons |
Yes |
| Flue Outlet Diameter |
6" |
| Recommended Connector Diameter |
6" |
| Chimney Type |
CAN/ULC S629 or UL 103 HT (2100°F) |
| Minimum Chimney Height |
15 ft. under qualifying installation conditions |
| Chimney Clearance to Combustibles |
2" |
| Mobile / Manufactured Home Installation |
Not Approved |
| Reference Framing Width |
37 3/4" |
| Height to First Header |
41 5/8" |
| Reference Framing Depth |
24 7/8" |
| Reference Total Framing Height |
80" |
| Minimum Ceiling Height |
80" |
| Side Mantel Clearance |
8" from door opening |
| Side Wall Clearance |
13" from door opening |
| Front Wall Clearance |
48" |
| Rear Enclosure Clearance |
0" |
| Side Enclosure Clearance |
0" |
| Floor Under Fireplace Clearance |
0" |
| U.S. Emissions Standard |
EPA 2020 Cordwood Standard |
| Canadian Emissions Standard |
CSA B415.1-10 |
| U.S. Safety Standard |
UL 127 |
| Canadian Safety Standard |
ULC S610 |
| Shipping Weight |
468 lb. (212 kg) |
| Warranty |
Limited Lifetime |
Flame Authority Expert Recommendation
Choose the Osburn Stratford II OB04007 when your project calls for a built-in zero-clearance wood fireplace with modern EPA-certified combustion, strong zone-heating capability, flexible front styling, and integrated air circulation.
Its 750–2,200 sq. ft. recommended heating area, 80,000 BTU/h maximum output, 2.5 cu. ft. firebox, 20" maximum log capacity, 8-hour maximum burn time, double ceramic-glass doors, moulded refractory components, stainless-steel secondary-air system, and included blower up to 176 CFM make it a strong fit for qualifying residential installations.
The most important planning step is the complete enclosure and chimney system. Confirm the 37 3/4" reference framing width, 41 5/8" first-header height, 24 7/8" reference framing depth, 80" total framing height, 6" chimney connection, 15 ft. minimum chimney system height, hearth extension, required faceplate, required door overlay, and 6" anchor plate before construction begins.
Also Available with Chimney Package
Official Manufacturer Resources
Installation & Owner's Manual
Manufacturer installation, operation, chimney, framing, hearth, clearance, maintenance, fresh-air, and safety information.
Osburn Stratford II Specification Sheet
Manufacturer heating, construction, dimensions, blower, combustion, emissions, and technical specifications.
Quick Install Reference Guide
Reference material for Stratford II installation planning. This guide does not replace the full installation manual.
Faceplate Installation Instructions
Manufacturer instructions for compatible Stratford II faceplate installation.
Osburn Stratford II OB04007 FAQs
Is the Osburn Stratford II OB04007 EPA certified?
Yes. The Stratford II is compliant with the EPA 2020 cordwood standard and uses non-catalytic combustion technology.
How much space can the Stratford II heat?
The manufacturer recommends approximately 750 to 2,200 sq. ft. Actual heating performance depends on home construction, climate, chimney draft, fireplace location, heat loss, and fuel conditions.
What is the maximum heat output?
The Stratford II has a maximum dry-cordwood output of 80,000 BTU/h. Its separately specified overall heat-output range is 12,700–60,700 BTU/h.
How efficient is the Osburn Stratford II?
The supplied specifications list 64% average overall efficiency HHV, 68% LHV, and 70% optimum overall efficiency.
How long can the Stratford II burn?
The listed maximum burn time is up to 8 hours. Actual duration varies with wood load, species, moisture, draft, heat demand, and operating conditions.
What size logs fit the Stratford II?
The fireplace accepts logs up to 20 inches, while 16-inch dry cordwood is recommended.
What moisture content should the firewood have?
The supplied information recommends approximately 15%–20% moisture content for efficient operation.
Does the Stratford II include a blower?
Yes. The OB04007 includes a blower rated at up to 176 CFM.
What components are required to complete the Stratford II?
A compatible faceplate, door overlay, and 6-inch anchor plate are required for the final fireplace and chimney configuration.
What faceplate styles are available?
The supplied product information identifies Traditional and Prairie style faceplates.
What door overlay finishes are available?
The supplied product information identifies black and brushed nickel door overlays.
What size chimney does the Stratford II require?
The Stratford II uses a 6-inch flue outlet and 6-inch chimney connection.
What is the minimum chimney height?
The minimum chimney-system height is 15 feet from the base of the appliance to the chimney cap under qualifying installation conditions.
Can the Stratford II be installed in a mobile or manufactured home?
No. The Stratford II OB04007 is not approved for mobile or manufactured-home installation.
Is the Stratford II designed to heat an entire house?
It is designed primarily as a zone heater for the room where it is installed and connected spaces. The supplied information recommends maintaining another heating system as backup.
Does the Stratford II require hearth protection?
Yes. The hearth-extension requirements depend on installation height. A minimum 16-inch front extension and 8-inch side extensions are specified in the supplied installation information.
Can combustible framing be installed directly above the fireplace?
No. The required space above the fireplace must remain configured according to the installation instructions and must not be filled with combustible framing or insulation contrary to those requirements.
Can I use the quick-install guide instead of the full manual?
No. The Quick Install Reference Guide is not a substitute for the full Installation and Owner's Manual or the appliance certification label.
What safety standards does the Stratford II meet?
The fireplace is safety tested to UL 127 in the United States and ULC S610 in Canada.
Before You Order
Confirm Before Purchase
- You specifically need the Osburn Stratford II OB04007.
- Your project is suitable for a built-in zero-clearance wood fireplace.
- Your framing plan accommodates the reference installation dimensions.
- You have selected the required faceplate style.
- You have selected the required door overlay finish.
- You have selected the required 6-inch anchor plate.
- Your chimney system can meet the 6-inch connection and applicable 15-foot minimum height.
- You can maintain the required fireplace and chimney clearances.
- You can provide the required hearth extension.
- You understand the fireplace is not approved for mobile or manufactured homes.
- Any optional fresh-air or heat-distribution systems will be installed according to their dedicated instructions.
Do Not Assume
- That the faceplate is automatically included.
- That the door overlay is automatically included.
- That the 6-inch anchor plate can be omitted.
- That the 80,000 BTU maximum output is the same as the overall tested heat-output range.
- That the reference framing dimensions account for every finish or optional accessory configuration.
- That the quick-install guide replaces the full manual.
- That zero-clearance approval means every surrounding clearance is zero.
- That the fireplace is mobile-home approved.
- That gravity heat ducts may be connected to a central heating system.
Final planning check: Use the Stratford II Installation & Owner's Manual, Specification Sheet, Quick Install Reference Guide, Faceplate Instructions, and appliance certification label to verify framing, chimney, hearth, clearances, front components, optional air-distribution systems, and final installation requirements before construction.
