Enervex Chimney Fans – What You Need to Know Before You Buy
An ENERVEX fan is a combination chimney cap and chimney exhaust fan that will correct draft problems in almost any chimney!
How Enervex Fans work
The ENERVEX FAN (formerly named Exhausto Fan) mounts atop the chimney, where it literally sucks the smoke from the flue. Even difficult drafting problems such as poorly proportioned corner fireplaces, see-through fireplaces, backdrafting fireplaces, or odors from your chimney are solved with the ENERVEX Fan. ENERVEX fans are appropriate for masonry, air-cooled, and solid pack flues as well as for woodstoves and fireplace inserts.
The ENERVEX motor is completely enclosed and maintenance free with air-cooled, prelubricated, sealed ball bearings. It comes with a prewired junction box, a bird screen, and a speed motor control. Using the variable speed control, which is included with every Enervex fan, you can adjust the speed of the fan from the room where you have the fireplace. It also works as a ventilator: Turn it on when you need to refresh the air in the room, and the fan will pull out stale odors and cigarette smoke.
Description and Warranty
ENERVEX Fans are UL-listed, powerful, efficient, and very quiet. Made of extremely durable cast-aluminum and stainless steel, they have a six month money-back guarantee, a two-year warranty against defects in material and workmanship, and a 10-year warranty against corrosion. The ENERVEX Fans are designed for minimum energy consumption, using about as much energy as a regular light bulb.
Choosing the Right Enervex Fan
ENERVEX Fans come in four residential models: Models RS9, RS12, RS14, and RS16, ranging from smallest to largest. The model Enervex chimney fan you need is determined by
the size of your fireplace opening.
the style of flue you have, and
the area area of a flue,
The correct size Enervex Fan will correct any drafting problems at the lowest cost.
Measuring the area of your fireplace opening is easy: just measure the width and height of the fireplace opening, in inches, and multiply width times height to get the area in square inches. For example, 39″ wide by 30″ tall = 1170 square inches. NOTE: If you have a see-through fireplace, add the square inches of the larger side and 1/2 the square inches of the smaller side to determine your “fireplace opening size.”
To determine the style of flue you have, you will need to go onto your roof and physically inspect the flue pipe where it leaves the chimney.
It may be a clay (terracotta) pipe that is round, square, or rectangular.
It may be a round metal flue pipe that is just a single pipe like stove pipe or a chimney liner.
It may be a solid pack pipe (two concentric pipes with insulation between them and a covering over the insulation so you cannot see it).
It may be an air-cooled flue that has an inner pipe which is the actual flue, and either one or two air jackets surrounding the flue.
To determine the area of a square or rectangular flue pipe, multiply the inside length times the inside width. For example, a flue that measures 8″ by 8″ inside has an area of 64 square inches.
To determine the area of a round flue, measure the inside diameter, divide by two to get the radius, multiply the radius by itself and then by pi (3.14). For example, an 8″ flue has a 4″ radius. 4 x 4 = 16 x 3.14 = 50.24 square inches. For air-cooled flues remember to measure the innermost pipe.
Now that you have the area of your fireplace opening and the area of your flue, find the right combination of flue type, flue size, and fireplace opening size on the table below:
Before installing, check local codes as some local codes prohibit the use of chimney fans on gas and oil furnaces. We strongly encourage you to have the 110V wiring installed by a certified electrician.
If you wish to install an ENERVEX (Exhausto) Fan on a roundflue, you will need to purchase the appropriate adaptor.
Order a SOLID PACK Adaptor if you have a solid-pack flue, a stove pipe, or a chimney liner.
Order an AIR-COOLED Adaptor if you have a double wall or triple wall air- cooled flue.
Follow the printed installation instructions that come with the Enervex fan.