Majestic Fortress Indoor/Outdoor See-Through Gas Fireplace
The Majestic Fortress is a 36-inch see-through gas fireplace rated for indoor-outdoor use: one side faces the living room, the other the patio. Sizes: . Choose the size, then the front and interior that finish it; the price updates as you go.
- Type: Outdoor Gas Fireplace
- Sizes: Traditional Brick, Herringbone Brick
- Fuel: Natural gas; propane model by note
- Ignition: IntelliFire
- Made by: Majestic, a Hearth & Home Technologies brand
Who it's for
Right buyer. You want one 36-inch gas fireplace serving the living room and the patio through the same wall, rated for indoor-outdoor use.
Wrong buyer. Both sides are indoors, or both outdoors; a standard see-through or an outdoor unit does it for less.
Will it fit?
Framing the opening
Frame the rough opening below, measured inside the studs. Depth is from the finished face of the wall. Where the vent pipe goes through the framing there is a separate hole; the manual's drawing gives its position.
| Model | Width | Height | Depth |
|---|---|---|---|
| Fortress 36 Indoor/Outdoor See-Through | 49‑1/2" | 44‑7/8" | 23" |
Framing notes from the manual
- Fortress 36 Indoor/Outdoor See-Through: The unit sits in the exterior wall; one framed opening serves the indoor and the outdoor side. Vent pipe rough opening 10 in. Raise the unit for a hearth and the framing height rises with it.
The fireplace itself
| Model | Width | Height | Depth |
|---|---|---|---|
| Fortress 36 Indoor/Outdoor See-Through | 47‑1/2 | 44‑3/8 | 24 to 25‑5/8 |
Models and prices
Heat input is the range from the low to the high flame setting on natural gas and on propane. The LP model has the same price; order it by note.
| Model | Part | BTU per hour, NG | BTU per hour, LP | Fireplace only |
|---|
Required to complete: Traditional or herringbone brick Units are built NG. Conversion kit. The options below are the ones sold on this page; each is matched to its size.
Clearances
Clearances are to combustible materials, from the appliance. They come from the installation manual for this model and depend on how it is vented; the installer confirms them on site.
| Clearance | Minimum |
|---|---|
| Sides | 1" |
| Front | 48 on either face |
| Ceiling | 37‑3/4 from top of opening |
| Floor | 0; not on carpet, tile or vinyl unless on a full-size non-combustible panel |
Combustible mantel: the deeper it projects, the higher it must sit above the opening.
| Mantel projection | Minimum height above the opening |
|---|---|
| 12" | 16" |
Notes from the manual
Outdoor side: non-combustible hearth in front unless the unit is raised 3 in.; no combustibles between the two wall faces; exterior facing overlaps the outdoor face 3/4 in. and is sealed with high-temperature sealant; sealants rated 225 F.
Heat and gas
Heat input per hour on natural gas and on propane, low to high, and the efficiency where the maker publishes it.
| Model | BTU, natural gas | BTU, propane | Efficiency |
|---|---|---|---|
| Fortress 36 Indoor/Outdoor See-Through | 38,000 to 56,000 | 44,000 to 56,000 | — |
Choose your options
Interior and media
The interior is what you see behind the fire: a brick liner, a reflective black glass liner, or glass media in place of logs.
| Interior or media | Part | Price |
|---|---|---|
| Fortress traditional brick refractory | ODFORTG36-IT | $499 |
| Fortress herringbone brick refractory | ODFORTG36-IH | $559 |
Fans, heat management and controls
Available for this fireplace and priced by Majestic. Ask us to add any of them to your order.
| Item | Part | Price |
|---|---|---|
| Fortress indoor/outdoor gas fireplace with IntelliFire Touch ignition system, | ODFORTG-36 | $10,649 |
Installation and venting
| Venting | Requirement |
|---|---|
| Type | Direct vent |
| Pipe | DVP (SLP only with a power vent) |
| Min vertical | 24 in. before the first elbow |
| Max vertical | 40 ft (restrictor disc above 12 ft) |
| Max horizontal | per the sidewall vent graph; 24 in. of rise allows 36 in. horizontal |
Three 90-degree elbows maximum.
No venting. Outdoor gas fireplaces burn in the open air and are built with stainless and weather-rated components. The unit is installed in a non-combustible enclosure per the manual, outdoors only unless the model is rated indoor-outdoor.
What arrives
- Anti-reflective glass
- 56,000-38,000 BTUs (NG)
- Touch screen remote control
- 59,000-44,000 BTUs (LP)
- (RC400)
- Halogen accent lights
- 36" x 30" viewing area
- Factory installed outdoor kit
- CSA design certified
- Both Indoor and Outdoor Screen
- The front, interior and any accessories ship as their own cartons.
Before you order
- Installation is by a licensed gas installer. The fireplace, its venting and the gas line are inspected together, and the warranty depends on it.
- Framing, clearances to combustibles, mantel heights and the vent run come from the installation manual for your size. Send us your plan and we will check it before anything ships.
- Venting is sold separately and priced from the installer's plan: the pipe, elbows and termination depend on where the vent exits. Ask us for a vent quote with your order.
- Propane: every model is also made in an LP version at the same price. Add a note to your order and we will confirm the LP model before it ships.
- A 120-volt outlet or junction box at the fireplace is needed for the fan, lights and accessories; the ignition itself has battery backup.
- Special-order goods ship by freight. Confirm the size and the front before you order.
How it performs
The Fortress sits in an exterior wall with one face in the living room and the other on the patio, a single sealed direct-vent fire seen from both. Inside it is a normal direct-vent fireplace; outside the face is weather-rated and the framing rules are unusual, because the unit spans the wall.
Trade-offs to know
- It is framed in an exterior wall by a builder working from the manual; this is not a retrofit.
- 421 pounds; plan the delivery.
- The outdoor side needs a non-combustible hearth or a raised unit, and the exterior facing must be sealed with high-temperature sealant.
Living with it
Yearly service on the indoor side; check the exterior seals each spring.
Specifications
| Models | — |
|---|---|
| Type | Outdoor gas fireplace |
| Fuel | Natural gas; propane model at the same price |
| Heat input | See the table above |
| Ignition | IntelliFire Touch intermittent pilot with battery backup |
| Controls | Wall switch; RC400 remote and IntelliFire app with the Wi-Fi module |
| Electrical | 120 V for fan, lights and accessories |
| Manufacturer | Majestic, a Hearth & Home Technologies brand, USA |
| Weight, Fortress 36 Indoor/Outdoor See-Through | 421 lb |
Warranty
| Component | Coverage |
|---|---|
| Firebox and heat exchanger | Limited lifetime (20 years), 3 years labor |
| Burners, logs and metal or fiber refractory made by HHT | 10 years, 1 year labor |
| Cement refractory panels, glass liner panels | 3 years |
| Glass; electrical components (ignition modules, remotes and wall switches, valves, pilots, blowers, junction boxes, harnesses, transformers, lights) | 1 year parts and labor |
| All other parts | 1 year |
Source: Hearth & Home Technologies Limited Lifetime Warranty, the document packed with the appliance and linked from the owner's manual above. "Lifetime" means 20 years for gas appliances, 10 years for wood and pellet appliances and 5 years for standalone gas log sets, counted from the start of coverage, which begins no later than 24 months after the appliance ships from the factory.
Questions people ask
Can it go indoors?
Only the models Majestic rates indoor-outdoor, and only installed as the manual describes, with the required venting. Outdoor-only models must stay outside.
Does it need electricity?
The IntelliFire models need 120 volts for the ignition, fan and lights; the match-lit and manual-ignition models do not.
What is a front, and why is it required?
A Majestic direct-vent fireplace ships as the firebox and glass. The front is the finished face that covers the frame and the vents: a clean-face trim that disappears into the wall, or a decorative front with a screen. The fireplace cannot be finished without one, which is why the page will not let you order without choosing it.
What is IntelliFire Touch?
Majestic's intermittent-pilot ignition system. There is no standing pilot burning all year; the fireplace lights when you turn it on, from the wall switch, the remote or the app. It has a battery backup, so it still lights in a power outage. Flame height, the fan and the lights are controlled from the RC400 remote or the IntelliFire app with the Wi-Fi module.
Can I get it in propane?
Yes. Add a note to your order and we will confirm the LP model, which is the same price.
Can I return it?
Fireplaces are special-order freight items. Confirm the size, the front and the interior with us before you order, and contact us before returning anything.
What size gas line does it need?
A dedicated 1/2-inch line is typical for one fireplace; the manual gives the inlet pressure and the installer sizes the run. Natural gas needs 5 to 7 inches of water column at the appliance, propane 11 to 13.
Can it run in a power cut?
The IntelliFire Touch ignition has battery backup, so the fire lights and runs with the power off. The fan and lights need 120 volts and wait for it to return.
If you have any questions about this product, please let us know by filling out the form below, and we will contact you as soon as possible.
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