Duluth Forge Natural Gas Ventless Gas Fireplace Insert
- 26,000 BTU, natural gas, vent free
- Heats up to 1,350 sq ft
- Thermostat control, oxygen depletion sensor shut off
- 5 ceramic fiber logs, hand painted
- 13.9 x 29.1 x 23.9 inches, built-in
- 47.6 pounds, 1 year limited warranty
Updated 2 days ago · Based on the Amazon listing and published specifications, not hands-on testing.
A natural gas vent-free fireplace insert with a thermostat, an oxygen depletion sensor and five painted logs, sold for building a custom hearth. It needs no chimney, but the blower is a separate purchase.
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ASIN: B0FH7LWK3TModel: FNF300TCategory: Gas Fireplaces
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Overview
A built-in hearth, whether framed with a mantel or recessed in a wall, can use this zero clearance gas insert. It burns natural gas through a dual ported vent-free burner, and a thermostat cycles the unit on and off.
The reason to consider it is the heat output and the safety shut off in a unit that needs no outside duct or chimney. The limitation is that it is natural gas only and vent free, so confirm local rules and gas supply before buying.
Who it's for
Homeowners framing a new surround who have natural gas available but no flue and want thermostat control. Those on propane, or who live where vent-free units are restricted, should look at a vented or propane model.
Pros and cons
- Thermostat cycles the heat
- Oxygen depletion sensor shuts off
- Five hand painted logs
- No chimney or duct needed
- Natural gas only
- Blower sold separately
- Vent-free rules vary by area
Performance notes
A thermostat turns the burner on and off to hold the room near a set temperature. The oxygen depletion sensor shuts the burner if oxygen drops, and a vent-free burner releases its exhaust into the room, so the heating range and ventilation need to match the space.
Specifications
| Brand | Duluth Forge |
|---|---|
| Model | FNF300T |
| Dimensions & fit | |
| Item Dimensions D x W x H | 13.9"D x 29.1"W x 23.9"H |
| Orientation | Front-facing |
| Item weight | 47.6 pounds |
| Capacity & performance | |
| Heat Output | 26000 british thermal units |
| Heating Coverage | 1,350 sq ft |
| Power & efficiency | |
| Power Source | Natural Gas |
| Compatibility & installation | |
| Installation Type | Built-in |
| Included components | |
| Included Components | Fireplace insert, 5 ceramic fiber logs, User Manual |
| Warranty & support | |
| Warranty Type | 1 Year Limited Warranty |
| Other details | |
| Ventilation Type | Vent Free |
| Number of Batteries | 1 AAA batteries required |
| Additional Features | Safety Shut Off, Thermostat Control |
Frequently asked questions
Is the Duluth Forge FNF300T a propane fireplace?
No. It is the natural gas version, as the title and features say. Propane models are sold under different model numbers.
Does the FNF300T need a chimney?
No. It is vent free, and the seller copy says no outside duct or chimney is needed. Check local codes for vent-free heaters first.
Does the Duluth Forge FNF300T include a blower?
No. A blower, model FIB100, is sold separately.
What batteries does the FNF300T use?
One AAA battery for the piezo ignition, which the listing says is required. The box list does not mention a battery.