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Chimney Fan Sizing  -  Accessories & Controls  -  Fan Specifications  -  Masonry Installation  -  Metal Flue Installation  -  IntelliDraft




The World's Finest Mechanical Draft Systems

Enervex Chimney Fans
Model RS Chimney Fan Selection
Wood and Gas Fired Fireplaces and Stoves

QUICK SIZING....  STEP 1      Determine the type of opening, measure and calculate.....

         
One-sided   Two-sided (See-through)   Corner   Three-sided   Free-standing   Free-standing Round
A x B   1.5 x A x B   A x B   ( A + B ) x C   1.5 x A x B   1.185 x A2

QUICK SIZING....  STEP 2
Determine the type of flue and measure the INSIDE measurement... use the chart below to convert square and rectangular to round.

CONVERSION OF Rectangular / Square to Round Flues

Measure the INSIDE ( side to side ) measurements of the clay liner.

Ex...  The INSIDE measurement of 6 x 10" on a clay liner is equivalent to

10 (dim. A) - 6 (dim. B) = 8 (8" Round)

NOTE:  Clay liners are "called" by their OUTSIDE measurements, the INSIDE measurements may vary depending on the manufacturer and location.
EX. A 13x13 clay liner may only have an INSIDE measurement of 10" x 10"


QUICK SIZING....  STEP 3   
Use of the following fan selection tables below to calculate the Enervex fan required to fully exhaust the fireplace opening and flue system.

Note: The RED background indicates that the fan will most likely create some air-flow noise due to a high air velocity in the chimney.
The BLUE background indicates the fan base will not cover the chimney opening and a special adapter must be used.

  Fireplaces (wood-fired)
  Fireplace Opening in square inches
Flue Size Max. 400 Max. 600 Max. 900 Max. 1200 Max. 1500 Max. 2000 Max. 2500 Max. 3300
5 RS 12 RS 16 * * * * * *
6 RS 9 RS 12 RS 16 * * * * *
7 RS 9 RS 9 RS 14 RS 16 * * * *
 8 RS 9 RS 9 RS 12 RS 14 RS 16 * * *
9 RS 9 RS 9 RS 12 RS 14 RS 16 RS 16 * *
10 RS 9 RS 9 RS 12 RS 12 RS 14 RS 16 * *
12 RS 9 RS 9 RS 12 RS 12 RS 14 RS 14 RS 16 *
14 RS 9 RS 9 RS 12 RS 12 RS 12 RS 12 RS 14 RS 16
16 RS 9 RS 9 RS 12 RS 12 RS 12 RS 12 RS 14 RS 16
18 RS 9 RS 9 RS 12 RS 12 RS 12 RS 12 RS 14 RS 16
20 RS 9 RS 9 RS 12 RS 12 RS 12 RS 12 RS 14 RS 16
22 RS 9 RS 9 RS 12 RS 12 RS 12 RS 12 RS 14 RS 16
24 RS 9 RS 9 RS 12 RS 12 RS 12 RS 12 RS 14 RS 16

Check that there are no more than 2x90 elbows and no more than 30 of height. If there are more than 2x90 elbows, use a bigger fan.


The "opening in square inches" refers to the fireplace or appliances over-all face opening.

Example :  In a small wood burning fireplace, if the hearth opening is 18" x 24" with an 8" round ( INSIDE MEASUREMENT ) clay liner in a brick and mortar chimney we would...

Multiply the length and width, in this case 18" x 24" = 432 square inches.  Being less than 600, on the wood burning chart above, follow the column to the 8" flue size.  Highlighted in orange, the chart shows an RS 9 to be the proper size chimney fan for this application.


Note: The RED background indicates that the fan will most likely create some air-flow noise due to a high air velocity in the chimney.
The BLUE background indicates the fan base will not cover the chimney opening and a special adapter must be used.

  Fireplaces (gas-fired)
  Fireplace Opening in square inches
Flue Size Max. 400 Max. 600 Max. 1000 Max. 2000 Max. 2500 Max. 3000 Max. 3500 Max. 5000
5 RS 9 RS 12 * * * * * *
6 RS 9 RS 9 RS 12 * * * * *
7 RS 9 RS 9 RS 12 RS 14 RS 14 * * *
8 RS 9 RS 9 RS 9 RS 12 RS 16 * * *
9 RS 9 RS 9 RS 9 RS 12 RS 12 * * *
10 RS 9 RS 9 RS 9 RS 12 RS 14 RS 16 RS 16 *
12 RS 9 RS 9 RS 9 RS 12 RS 14 RS 14 RS 16 *
14 RS 9 RS 9 RS 9 RS 12 RS 14 RS 14 RS 14 *
16 RS 9 RS 9 RS 9 RS 12 RS 14 RS 14 RS 14 *
18 RS 9 RS 9 RS 9 RS 12 RS 14 RS 14 RS 14 RS 16
20 RS 9 RS 9 RS 9 RS 12 RS 14 RS 14 RS 14 RS 16
22 RS 9 RS 9 RS 9 RS 12 RS 14 RS 14 RS 14 RS 16
24 RS 9 RS 9 RS 9 RS 12 RS 14 RS 14 RS 14 RS 16

Check that there are no more than 2x90 elbows and no more than 30 of height. If there are more than 2x90 elbows, use a bigger fan.

Gas fireplaces will need additional controls...

PDS (Proven Draft Switch) Safety control that senses a draft.  A pressure sensor that ties into the log set or appliance controls and would shut the gas off if the draft became negative.

ADC 100  A pre/post purge control that would extend the the fan cycle before and after gas is present for a fireplace or appliance.

NEW!!! MFD Mechanical Fireplace Damper. Prevents excess heat from escaping through the chimney when the fireplace is not in use.


 

Wood stoves, coal stoves and fireplace inserts

  Stoves Fireplace Inserts
  Door Opening in square inches     A x B
Flue Size Max. 300 OVER  300
6 RS 9 RS 12
7 RS 9 RS 12
8 RS 9 RS 12
9 RS 9 RS 12
10 RS 9 RS 12

Check that there are no more than 2x90 elbows and no more than 30 of height.
If there is more than 2x90 elbows, use a bigger fan.


Fan Specifications

 1 Junction Box
 2
Conduit/cord
 3 Motor
 
4
Motor Housing
 5
Cooling Plates
 6 Bird Screen
 7 Base Plate
 8 Locking Nut
 9 Inlet
 
10 Axial Vane
 11 Hinges
 12
Capacitor
 ( inside J-box )

 


 Capacitor
 Wiring Diagram



Enervex Fans...the ultimate draft solution.

Click below to learn more about Enervex Chimney Fans

Masonary Installation
Fan Specifications
Volko Chimney Fans is your source for the Exhausto chimney fan.

Chimney Pipe Installation

Fan Maintenance

 Easy No-Mess Installation.

Quiet operation.

Eliminates smoke odors.

Easy to operate.

Low operating cost.

Variable speed motor.

Accessories Chimney Fan Home

Size Selection

 

   

 

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