Fireplace Heat Management Systems: Why You Need One and How They Work

A fireplace heat management system takes the hot air that builds up above a gas fireplace and sends it somewhere better: out a vent higher on the wall, into another room, or outside the house. If you want a TV over a modern linear fireplace, or you want to run the flame on a mild night without overheating the room, heat management is what makes that possible. Below we cover why it's needed, the three ways these systems work, and how Superior, Majestic, Napoleon and Empire each handle it.

Why a gas fireplace needs heat management

A gas fireplace gives off heat two ways. Radiant heat comes off the glass and warms you directly. Convective heat rises off the top of the firebox and climbs straight up the wall. On a wide linear fireplace, that column of hot air lands right where most people want to hang a TV.

The numbers are higher than most homeowners expect. Here is what the wall above an average gas fireplace with no heat management can reach:

Right above the firebox, the wall can run well past the boiling point of water (212°F). Heat management systems are built to pull that heat off the wall, and that matters for four reasons.

1. Your TV and electronics

TVs, soundbars and streaming boxes are built to run at room temperature. Most TV makers rate their sets to operate at up to about 100°F to 104°F, far below what the wall above an unmanaged fireplace can reach. Superior's HeatFlo instructions tell owners to check the TV manufacturer's temperature specs before mounting one over a fireplace. Heat management lowers the wall temperature so the TV can go where you want it without baking.

2. Wall finishes, mantels and decor

Paint, wood, stone veneer, tile and the adhesives behind them all have heat limits. On the Echelon II, Majestic asks that every surrounding finish (wall, mantel and floor) be rated to withstand 190°F. Finishes that aren't rated for that kind of heat can discolor, crack or pull loose over time, and the same goes for artwork or a wood mantel shelf.

3. Room comfort

A modern linear fireplace puts out a lot of heat. In a big open great room on a cold night, that's welcome. In a media room, a condo, a bedroom or a home in a warm climate, the room can get too hot long before you're ready to turn the flame off. Systems that send heat to another room or outside let you keep the fire going for the look and the ambiance.

4. Design freedom

Without heat management, the usual fix is to raise the TV and add a mantel to deflect the heat. With it, the TV can sit much lower and closer to eye level. Per the manufacturers: Majestic Passive Heat allows a TV 12" above the opening with no mantel, Empire's Gravity Air Kit allows a TV or mantel as low as 16", and Napoleon's Dynamic Heat Control allows a TV or artwork directly above the fireplace.

What about just using a mantel?

A properly sized mantel is the traditional alternative. It acts as a heat deflector, kicking the hot air rising off the glass out into the room so it doesn't run straight up into the TV. You skip the kit and the extra framing. The trade-offs: the TV has to sit above the mantel, so it ends up higher, and the wall between the opening and the mantel still gets hot. Mantel depth and height must come from the fireplace manufacturer's mantel projection charts in the installation manual. A mantel plus heat management gives you the coolest wall of all.

The three ways heat management works

Every brand's system falls into one of three groups, and some can be combined.

• Passive release into the same room. No fan and no electricity. Hot air collects in a channel behind the wall and exits through a slot or registers higher up or off to the sides, so the heat stays in the room but bypasses the TV wall. Examples: Majestic Passive Heat, Superior HeatFlo, Napoleon DHC, UHM and DHM, and Empire's Gravity Air Kit.
• Ducted to another room. Heat travels through duct to a register in a nearby room that needs it. Examples: Majestic Heat-Zone, Napoleon LHAD and DHC+.
• Vented outside. A fan pushes excess heat out of the house, so you get the flame with less heat. Examples: Majestic Heat-Out, Empire's Exterior Forced Air Kit (HMFA) and Napoleon DHC+.

Superior (IHP) HeatFlo

Superior's HeatFlo convection kit redirects the convective heat that normally comes out the front of the unit up to a register higher on the wall. Collars attach to the fireplace, flex pipe runs up inside the wall, and the heat exits through a register set in a framed opening. HeatFlo kits are model-specific: there are versions for Superior's vent-free fireplaces (HTFLO-VF45 and VF55, which can't be combined with a blower), the DRL direct-vent linears (HTFLO-DV45, DV55 and LIN60/72/84), and the EPA HeatFlo kit for the WCT4920 and WCT6920 wood-burning fireplaces.

Key layout rules from the HTFLO-VF45/VF55 instructions:

• The register opening sits at least 76" above the base of the fireplace, and no more than 20 ft from the base.
• Keep 6" of non-combustible material above the register and 6" between the register and the ceiling.
• A TV on a flush wall goes at least 18" above the fireplace opening, at least 3" below the register and at least 6" below the ceiling.
• Install the kit at the framing stage.

Clearances differ by kit, so check the instructions for your exact model.

Majestic heat management

Majestic (Hearth & Home Technologies) offers the widest menu, and its kits can be paired. On the Echelon II linear, here's how the options line up.

Passive Heat

Warm air is released back into the same room through a slot or registers instead of heating the wall. Majestic's TV guideline allows a TV just 12" above the fireplace opening with no mantel or shelf. It starts with the PH-MR starting collars, then one of three layouts:

• Front discharge: one linear slot above the fireplace, finished with the PH-FRTTRIM vent trim or a clean drywall return. On the Echelon II 72", the top of the slot sits 94" above the bottom of the fireplace, so plan for ceiling height.
• Side discharge: two 12-1/4" x 8-3/4" registers, one on each side (PH-SIDETRIM). Requires 95" minimum from the bottom of the fireplace to the ceiling and an 18" non-combustible zone on each side.
• Open top chase: the sides and top of the chase open into the room.

A chase ceiling is required above the discharge opening, and wire mesh is needed if the opening is wider than 3".

Ducted Passive Heat

Same idea as Passive Heat, but ducted so the discharge slot can be placed more freely in the design.

Heat-Zone

The Heat-Zone kit (fan, 20 ft of 6" duct, register and wall control) moves heat to another room up to 20 ft away. Run continuously, one kit redirects up to 25% of the heat, or up to 50% with two kits. Echelon II units need the HZLIN-ADP adapter.

Heat-Out

The Heat-Out kit sends excess heat outside, up to 25 ft away, and can remove up to 40% of the heat when run continuously on high. It's a good fit when you want the flame for ambiance more than for warmth.

Passive Heat can be paired with one Heat-Zone or one Heat-Out kit, so you can keep the wall cool and still send heat elsewhere. All Majestic heat management has to be planned and installed at framing.

Napoleon heat management

Napoleon offers several systems, each matched to specific fireplace series.

• Dynamic Heat Control (DHC): no ducts, fans or power. The enclosure stops short of the ceiling and heat exits through an outlet at the top, allowing zero clearance to combustibles and a TV or artwork directly above the fireplace. Available on Luxuria, Vector and Elevation X.
• DHC+: adds a variable-speed fan so you can send heat to other areas of the home or outdoors.
• Universal Heat Management (UHM): passive, needs no electricity, and uses ducts to move heat to front or side grills. It lowers clearances so electronics can go above. Available on Ascent Linear, Ascent X, Ascent Deep, Elevation and Altitude X.
• Ducted Heat Management (DHM): passive, with ducts and termination plates for front, side or off-the-side discharge and zero clearance above. Available on Luxuria and Vector.
• Hot Air Distribution Kit (LHAD): uses flex duct to send heat to another room or outdoors, and a fan is optional. Available on Vector, Ascent Linear, Altitude X, Ascent X, Ascent Deep and Elevation X.

Napoleon's internal blower circulates heat into the same room. It helps with comfort, but it doesn't take the place of a heat management system when a TV goes above. For help sorting out the Ascent and Elevation lines, see our Napoleon Ascent vs Ascent X vs Altitude X vs Elevation X comparison.

Empire heat management

Empire's two systems are built around its Boulevard linear fireplaces.

• Interior Gravity Air Kit (HMGW): moves heat through ducting behind the wall to a discharge near the ceiling. It reduces wall temperatures enough that a TV or mantel can go as low as 16" above the opening.
• Exterior Forced Air Kit (HMFA): a variable-speed blower mounted on an exterior wall pulls a chosen share of the heat outside, so you control how much enters the room. It needs the SD6DFA25 flex kit (25 ft) and a model-sized heat transfer kit, which is made for the vent-free Boulevard (VFLB) only. Add the HMFATV kit if a TV is mounted above. The exterior wall must be 4" to 12-1/2" thick, the framed opening is 14-1/2" x 14-1/2", and because the blower can expel up to 150 CFM, the home needs a make-up air plan.

Both are built for the Boulevard family, including the vent-free Boulevard 60" and Boulevard 72". Check each kit listing for the sizes it fits.

Heat management systems compared

So which one fits your home?

• You want the TV low and the heat in the room: go passive. Majestic Passive Heat, Napoleon DHC or DHM, Empire's Gravity Air Kit or Superior HeatFlo, depending on the fireplace you choose.
• The fireplace room runs warm but another room runs cold: Majestic Heat-Zone, Napoleon LHAD or DHC+.
• You want the flame year-round in a warm climate, condo or media room: Majestic Heat-Out, Empire HMFA or Napoleon DHC+ vented outdoors.
• You want both a cool wall and less heat in the room: pair Majestic Passive Heat with Heat-Out.

Plan it before the walls go up

Heat management is far easier to get right on paper than after drywall. Before framing:

• Pick the fireplace and kit together. Every kit on this page is made for specific models.
• Check ceiling height. Majestic's side discharge needs 95" from the bottom of the fireplace to the ceiling, and Superior's register sits at least 76" up with 6" below the ceiling.
• Frame for the kit. That can mean a chase ceiling, non-combustible zones, register openings or a wall opening to the outside.
• Plan power and controls for fan-driven kits such as Heat-Zone, Heat-Out, DHC+ and HMFA.
• Plan make-up air when a fan exhausts heat outside, as with Empire's HMFA.
• Check your TV's temperature rating against the fireplace maker's TV guidelines.

New to venting basics? Start with What is a Direct Vent Fireplace?

Get the right kit for your fireplace

Send us your fireplace model, wall layout and where you want the TV, and our hearth team will match the heat management kit and every part it needs. Call 888-486-2909, or browse our linear fireplaces and direct vent gas fireplaces.

Frequently asked questions

Can I mount a TV above a gas fireplace?

Yes, with the right setup. Manufacturer guidelines allow a TV 12" above the opening with Majestic Passive Heat, 16" with Empire's Gravity Air Kit, 18" with Superior's HTFLO-VF kits, and directly above with Napoleon DHC. Always confirm against your TV's maximum operating temperature.

Why does the wall above my fireplace get so hot?

Convective heat rises off the top of the firebox and runs up the wall. On an average gas fireplace with no heat management, the wall 6" to 12" above the firebox can reach 240°F to 320°F.

Does heat management reduce the heat I get from the fireplace?

Passive systems keep the heat in the same room and release it higher up. Fan kits move part of it elsewhere: Majestic Heat-Zone redirects up to 25% per kit (50% with two), Heat-Out removes up to 40% on high, and Empire's HMFA lets you set how much goes outside.

Do heat management systems need electricity?

Passive systems (Majestic Passive Heat, Superior HeatFlo, Napoleon DHC, UHM and DHM, Empire Gravity Air Kit) need none. Fan-driven kits (Majestic Heat-Zone and Heat-Out, Napoleon DHC+, Empire HMFA) do. Napoleon's LHAD works either way, since its fan is optional.

Can I add heat management to an existing fireplace?

These kits are designed to go in at framing, and Majestic and Superior both call for installation at that stage. Adding one later means opening the wall, so call us with your model number and we'll tell you what's involved.

Can I use one brand's kit on another brand's fireplace?

No. Each kit is engineered and listed for specific fireplace models from the same manufacturer.