HearthStone GMi 90 Green Mountain Wood Insert

The GMi 90 brings HearthStone's soapstone and cast iron into your existing fireplace. The cast iron front sits flush with the hearth for a tidy, finished look, and you can have it in matte black or HearthStone's brown enamel.

Behind that front is a soapstone-lined firebox that holds 2.5 cubic feet and takes logs up to 20 inches. It's a non-catalytic design, and the blower is included. It measures 38 1/2 inches wide, and the minimum fireplace opening is listed below.

Why Homeowners Choose the GMi 90

• Soapstone-lined firebox. Soapstone lines the firebox.
• Flush cast iron front. The front fits flush with the hearth, available in matte black or brown enamel.
• Room for 20 inch logs. A 2.5 cubic foot firebox takes full-length splits up to 20 inches.
• Blower included. The blower is part of the package, not an add-on.

This listing is the HearthStone GMi 90 (Green Mountain Insert 90) non-catalytic wood insert, model 8460, offered in matte black (8460-0010) and brown enamel (8460-0020).

Key Specifications

• Combustion: Non-catalytic
• Minimum fireplace opening: 31 3/4 in W x 27 1/8 in H x 22 1/8 in D (with optional surround extension)
• Firebox capacity: 2.5 cu ft
• Maximum log length: 20 in
• Flue size: 6 in, top exit
• Blower: Included
• Dimensions (W x D x H): 38 1/2 in x 24 7/8 in x 28 3/4 in
• HeatLife (HearthStone rating): 8 hours

HeatLife is a HearthStone rating, not a promise. Burn times vary with your wood, your chimney, and how you load and set the insert.

Ownership & Maintenance

There's no catalytic combustor on the GMi 90. We offer ongoing service for our customers.

Check the minimum fireplace opening below and talk with us about fit. See more wood inserts or stop by our Auburn, Brunswick, and Yarmouth showrooms to plan the liner and installation.