Discover Enervex advanced solutions, including pressure transducers, fan speed controls and more

Enervex is the North American brand name for chimney fans and mechanical draft systems manufactured by Exodraft, a Danish engineering company whose chimney fan technology dates back to 1957. The US business was established in Alpharetta, Georgia in 1990 under the name Exhausto, which changed its name to Enervex in January 2011. Today, Enervex markets the most extensive portfolio of residential and commercial demand-controlled exhaust systems available in North America, with the parent company Exodraft selling products in over 40 countries worldwide. The business is approximately 70 percent commercial — covering offices, hotels, healthcare facilities, sports venues, and multi-family buildings — and 30 percent residential. Carefree Home Furnishings is an authorised Enervex dealer with free shipping sitewide.

An Enervex chimney fan is a mechanical draft device that mounts at the top of a chimney and uses a motorised fan to create consistent negative pressure throughout the entire chimney or stack system. Instead of relying on passive natural draft — which depends on temperature differential, chimney height, and weather conditions — an Enervex fan mechanically draws combustion gases, smoke, and odours up and out of the flue at a controlled rate. The fan operates at variable speeds, automatically adjusting output to maintain the correct draft level regardless of outdoor conditions. Because the fan sits at the chimney termination point rather than inside the flue, it keeps combustion gases flowing in only one direction — out — which also prevents backdrafting when the appliance is not in use.

Enervex chimney fans are the preferred professional solution for three categories of draft problems. First, chronic backdrafting — smoke or combustion gases entering the living space from the fireplace or stove opening — which is typically caused by negative pressure inside the home, competing exhaust fans, or inadequate chimney height. Second, poor draw — fires that are difficult to light, burn poorly, or produce excessive smoke — caused by insufficient natural draft in short or oversized chimneys. Third, odour intrusion — fireplace smells entering the home when the appliance is not in use — caused by downdrafts that push air down through the flue rather than allowing it to vent outward. An Enervex fan eliminates all three issues by creating reliable, consistent mechanical draft independent of weather, wind, and building pressure conditions.

The RS and RSHT are Enervex’s two primary residential chimney fan series, and the key difference is the fuel type and operating temperature they are designed for. The RS series is designed for gas-fired and oil-fired fireplaces, stoves, and boilers — appliances that produce lower-temperature exhaust gases. The RSHT is a high-temperature model designed for solid-fuel applications including wood-burning fireplaces, wood stoves, barbecues, pizza ovens, and other appliances that produce exhaust at significantly higher temperatures, up to 575°F (300°C). If you have a wood-burning fireplace or a pizza oven and need a draft solution, the RSHT is the correct model. Using the RS on a high-temperature application would risk motor damage and void the warranty.

Enervex chimney fans are always installed at the chimney termination point — the very top of the chimney or flue stack. This placement is critical because it creates negative pressure throughout the entire length of the chimney below it, ensuring consistent draft from the appliance all the way to the cap. The fan can be installed vertically at the flue opening for standard top-mounted applications, or horizontally for sidewall venting configurations. The compact design keeps the fan barely visible from ground level, and the unit can be recessed or concealed behind a chimney top enclosure such as a cap, shroud, or cupola. The hinged housing opens for easy access for cleaning and service without requiring disassembly.

Enervex chimney fans are highly energy-efficient — they use approximately the same amount of electricity as a single incandescent light bulb during operation. This low power draw is possible because the fan’s role is to maintain draft rather than to produce heat or power a large appliance. The variable speed motor adjusts output to the minimum level required to maintain correct draft, avoiding unnecessary energy use. The fans use Class H insulated, permanently lubricated and sealed ball-bearing motors that are maintenance-free and designed for long operational life, keeping both running costs and maintenance costs extremely low over the lifetime of the installation.

Yes — Enervex fans create negative pressure in the chimney system regardless of chimney construction type, because the mechanical draft they generate is not dependent on chimney material, liner type, or chimney geometry in the way that natural draft is. They are compatible with masonry chimneys, prefabricated metal chimneys, and liner systems. The RS and RSHT fans are available in four sizes — typically covering flue diameters from 5 to 12 inches — so the correct model must be selected to match your specific flue diameter. Enervex also offers the RSV series for larger commercial or industrial stack applications, and the GSV series for commercial kitchen hood exhaust and pizza oven applications.

Yes — this is one of the core advantages of a mechanical draft system over natural draft. Natural draft is highly sensitive to outdoor temperature, wind direction, atmospheric pressure, and seasonal changes — conditions that cause fireplaces to backdraft or draw poorly, particularly during mild weather when the temperature differential between the flue and the outside air is minimal. An Enervex fan creates consistent mechanical draft regardless of outdoor temperature, wind, or barometric pressure. The stainless steel housing with a black corrosion-resistant paint finish is rated for outdoor exposure year-round. The IP54-rated motor is a split capacitor, totally enclosed design that protects against dust and water ingress in outdoor installation conditions.

Yes — Enervex offers a full range of control systems for automated and variable-speed operation. The ADC100 Universal Control with variable speed allows the fan speed to be set and adjusted to match the specific draft requirements of your installation. The ADC150 Modulating Fan Control adds a damper control and pressure transducer for fully automatic draft management — the system monitors flue pressure and modulates fan speed continuously to maintain the correct draft level without any manual adjustment. The EFC 211 Fan Control monitors and maintains proper draft in solid-fuel appliances by monitoring fan speed. For the most advanced installations, Enervex’s Xzense control system provides full remote control of the fireplace and maximum comfort through smart integration with the chimney fan system.

Professional installation by a licensed chimney technician or HVAC contractor is strongly recommended and, in many jurisdictions, required for code compliance. Enervex fans must be installed at the correct chimney termination point, sized correctly to the flue diameter, electrically connected in accordance with the National Electrical Code (NFPA 70), and interlocked with a safety system such as a Proven Draft Switch to prevent the connected appliance from operating if the fan is not running. All electrical wiring must comply with the requirements of the authority having jurisdiction. Correct sizing is critical — an undersized fan will not resolve the draft problem, and an incorrectly wired installation will not be covered under warranty. Enervex fans are ETL Listed under file number 514733 and tested to UL Standard 378 for Draft Equipment, but these listings apply only when the fan is installed correctly per the installation manual.