Osburn Matrix Large Wood Insert

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36.13 (in)
25.13 (in)
23.13 (in)
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Osburn Matrix Wood Insert EPA 2020 Certified - Large Wood Burning Insert

Osburn Matrix Large Wood Insert

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  • Premium Quality




This updated version of the Matrix wood insert will seduce you with an average particle emission rate as low as 1.54 g/h. The latest modifications made to this box are well in tune with the industry standards required for 2020. Although it retains a unique style that is both massive and sleek, we have reviewed the door mechanism to make it more functional. Adding a set of intermediate trim panels may be required to complete your masonry hearth. Always the same legendary Osburn quality.

**Note that in order to install the optional projection kit AC01323, one of the optional faceplate backing plate kit AC01322 or AC01332 must be purchased separately to secure the projection kit to it.


Height X Width X Depth - Overall

25 1/8" X 36 1/8" X 23 1/8"

Maximum log length 20''
Fireplace opening - minimum (Height X Width X Depth) 23 3/4" X 28 7/8" X 19 5/8"

484 lb (220 kg)

Firebox volume (cu. ft.) 2.4
Recommended heating area (sq.ft.)

750 - 2,100 

Recommended chimney diameter 6"
Maximum burn time 8 h
Blower Included Yes
Fuel Type Dry cordwood
Maximum heat output 75,000 BTU/h (22.0 kW)


Combustion technology Non-catalytic
Fuel type Dry cordwood
Recommended heating area (sq.ft.) 500 - 2,100
Firebox nominal volume (cu. ft.) 2.4
Maximum burn time 8 h
Maximum heat output (dry cordwood) 75,000 BTU/h (22.0 kW)
Overall heat output rate (min. to max.) 14,800 BTU/h (4.34 kW)
Overall heat output rate (max.) 28,600 BTU/h (8.38 kW)
Average overall efficiency (EPA cribs / Douglas fir) N.A.
Average overall efficiency (EPA cribs / Douglas fir) N.A.
Average overall efficiency (dry cordwood) 69 %
Average overall efficiency (dry cordwood) 74 %
Optimum efficiency 77 %
Average particulate emissions rate 1.54 g/h
Average CO 89.4 g/h
High-efficiency EPA certified appliance Yes, EPA 2020 approved
Maximum log length 20"
Log positioning Over width
Chimney diameter 6"
Flue outlet diameter 6"
Type of chimney Liner - ULC-S635, CAN/ULC-S640, UL1777
Minimum chimney height (feet) 12'
Baffle type C-Cast
Approved for an alcove installation N.A.
Approved for a mobile home installation No
Shipping Weight 484 lb (220 kg)
Door type Single, glass with cast iron frame
Glass type Ceramic glass
Glass surface – dimensions (Width X Height) 19 5/8" X 11 7/8"
Glass air-wash system Yes
Premium quality blower included (CFM) 90
Overall dimension (Height) 25 1/8"
Overall dimension (Width) 36 1/8"
Overall dimension (Depth) 23 1/8"
Door opening – dimension (Height) 8 3/4"
Door opening - dimension (Width) 17 1/2"
Firebox – dimension (Height) 11 7/8"
Firebox – dimension (Width) 21"
Firebox – dimension (Depth) 16 3/4"
Firebox lined with refractory bricks for better heat distribution Yes
Stainless-steel secondary-air system improving gas combustion Yes
Steel thickness – body 3/16"
Steel thickness – top 5/16"
Fireplace opening – minimum (Height) 23 5/16"
Fireplace opening – minimum (Width) 28 7/8"
Fireplace opening – minimum (Depth) 19 5/8"
USA standard (emissions) EPA / ASTM WK47329
Canadian Standard (emissions) CSA B415.1-10
USA standard (safety) UL 1482, UL 737
Canadian standard (safety) ULC S628
Tested and listed as per applicable standards By an accredited laboratory (CAN/USA)
Warranty Limited lifetime
Minimum clearances to combustibles*
(Data expressed in inches. 1 inch = 25.4 mm)
  Canada United-States
Clearance – combustible side mantle to unit 9" 9"
Clearance – combustible top mantle to unit 27" 27"
Clearance – combustible side wall to unit 16" 16"
Clearance – minimum floor protection in front of the appliance 18" 16"
Clearance – top shelf to unit 27" 27"

* The information given on the certification label affixed to the appliance always overrides the information published in any other media (owner's manual, catalogues, flyers, magazines and/or web sites).