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Preparation of fan Locate the installation brackets in the grooves on the underside of the fan base using the bolts and nuts supplied, to secure the brackets. Note that the bolts shall be installed from the bottom side in the two inner holes. Adjust the final position of the installation brackets ensuring that there is clearance between the brackets and the flue wall. If the brackets touch the flue wall, it is likely to create some noise from the vibration. |
Step 3:
The chimney fan is now ready for installation on the top of the chimney. Place the fiber mat on the top of the chimney, with the aluminum facing upwards, and place the fan on the top of the mat.
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Step 4:
Decide on the location of the bolt and wall plug (1). Drill a hole in the stack and secure the safety wire by the bolt and the wall plug. Take the safety wire through the hole in the fan base and return it to the free clamp of the wire. Tighten the safety wire slightly (2) and crimp the free clamp to provide secure anchoring for subsequent safe cleaning and service. Fit the liquid tight junction box (3) on the outside wall of the chimney stack, but make sure the conduit is 10-12" away from the fan outlet. Run the installation cable to the fan speed control/switch and the main electric supply.
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Caution: Under conditions with extremely strong winds constantly surrounding the top of the chimney, the chimney fan must be secured by steel wires or similar.
Chimney Fan Wiring
Special Applications.
1. High temperature applications.
If the fan is used for applications where the flue gas temperature exceeds 400°F at the exit point, but does not exceed 650°F, dilution bolts must be used. Typical situations are chimneys that are only 6-8' high. Dilution bolts will cause cool air to mix with the warm exhaust gas as they will lift the fan from the chimney and leave space so the cool air can get in.
The dilution bolts should be installed in the outer holes in the fan base. The dilution bolts should be adjusted in height, so the flue gas temperature does not exceed 400°F when discharged through the fan. However, in order to minimize soot deposits make sure the temperatures is above 320°F. When using dilution bolts the fan’s actual capacity decreases and you might need a stronger model. Fiber mat is not required when using dilution bolts.
2. The Flue is Bigger than the Fan Base.
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If the flue size exceeds the size of the fan base, it is necessary to alter the top of the chimney by installing a support flange, made out of stainless steel, as shown. The support flange must be secured and the hole in the center must be 12" in diameter. Note: Using only one flue can cause problems with flow noise due to high velocities. Chimney fans operating in tandem should always be of the same size. |
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3. The Flue Pipe is Higher than the Chimney.
In many cases, the chimney is designed so the liner or the chimney insert sticks several inches up over the chimney top. If it is a few inches, it’s recommended to install the chimney fan on the top, provided the pipe will give enough support for the fan. If there’s insufficient support, the liner or the flue must be cut back, so it is flush with the top of the chimney and the chimney fan can be installed as described in the previous.
4. Two Flues Servicing One Fireplace
This solution is used by many designers when the fireplace opening is large, and the total flue opening must be larger than a standard pipe or liner. By installing two separate flues the builder has accomplished a total flue opening big enough for the fireplace opening. When sizing a chimney fan for this kind of application, there are two ways to go about it: One of the flues must be shut off or disconnected and the chimney fan installed on the open flue, or A chimney fan should be installed on each flue and operate in tandem.
Exhausto Fans...the ultimate draft solution.
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