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    $500+ Purchase
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    $1000+ Purchase
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    $2000+ Purchase
  • Fantech FG 4

  • Fantech FG 6XL

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Only airtight centrifugal fan available, isolates duct without restricting airflow Check installation tab for assembly drawings Lead Time: 1-5 days

Site Wide Discounts

  • 5% Off
    $500+ Purchase
  • 10% Off
    $1000+ Purchase
  • 15% Off
    $2000+ Purchase

PRODUCT USE

Proper ventilation is crucial to creating a comfortable space. The complexity of the ventilation system will depend on the size of the room. For most rooms, the minimum would include at least one air supply with more efficient designs having both an air supply and an air return. Rooms that are properly treated to isolate sound have a unique problem with ventilation in that they are air tight. So the bare minimum for these types of spaces now becomes one air supply and one air return. These duct openings need to be isolated, and the Fantech FG centrifugal fan is the best way to isolate without restricting airflow.

Our experience with HVAC is limited to our own experiences in general construction. So please use our information to help guide you and your HVAC contractor. Ultimately they will be able to calculate the number of supply and return duct needed for your room along with the proper sizing.

SIZING

The Fantech FG 4 and FG 6XL sizes fit nearly all applications for our customers. Typically the FG 4 is used in vocal booths or other small rooms while the Fantech FG 6XL is more often used in larger rooms. Whichever size you use make sure to use the same size for both supply and return. Please consult with a local HVAC installer to create a plan for using Fantech FG fans in your project. If the HVAC is already installed then you will need one FG fan for each duct entering or exiting your project.

INSTALLATION

We recommend using the Fantech FG Series to isolate both the supply air and return air for your sound isolated room. There are many ways you can install this inline centrifugal fan depending on the location of your current duct work. Below you can find two common assemblies using the Fantech FG. Read below for more information.

The Fantech FG does have an electrical component to allow the fan to work. We strongly recommended adding an access panel near the outlet used to control the Fantech FG. As an alternative, you can run the plug for the Fantech FG through the drywall and into an outlet on the outside of the wall. This way you can eliminate the requirement of the access panel. For a nearly hidden access panel with high isolation properties, Google search and purchase the Elmdor Recessed Acoustic Tile Access Door.

FANTECH FG INSTALLED IN SOFFIT (DUCT INSIDE SOFFIT)

If you are isolating the HVAC from within the room, then you will need to build either a soffit or place the duct in between joists. The drawing above is a soffit assembly that works for both the return air and supply air duct. Your room will need at least one of each for equal air pressure. If you are placing your duct work between your joists, then imagine the drawing with the duct running between the joists. Included in the drawing is also a basic design to isolate the ductwork using the GenieClip LB.

Based on advice from the manufacturer, the best plan is to use rigid duct from the duct opening to the Fantech fan and treat that rigid duct with a damping pad like our VibraDamp. If flex duct is used on everything, then the sound will pass right through the duct before reaching the Fantech fan. With the treated rigid duct we can trap the sound in the duct (which will reduce the strength of the vibrations), have it pass through the Fantech FG (which will reduce remaining sound vibrations significantly), and have the remaining sound absorb into flex duct beyond the Fantech FG. The size of the duct used is not crucial to the design, but must be reduced to fit around the opening of the Fantech FG. Check the Product Specs for more information on the sizing for your Fantech FG fan.

The finish of the soffit is drawn with basic drywall. The finish for your soffit should match the finish of your ceiling assembly. To improve further on this design you can build the soffit after hanging drywall on the ceiling and walls.

FANTECH FG FOR SOUND BOOTH (DUCT WORK OUTSIDE)

If you are isolating the HVAC to a small booth or a room that allows you to build a structure on the back side of an exterior wall, then you can follow the design in the drawing to the right. This plan will change depending on which direction your duct is running. The drawing above is a vertical soffit-type structure that allows space for both the return air and supply air duct. We recommend supplying your booth with air near the floor and returning that air through the return air duct near the ceiling. These soffit-type structures can be built next to each other in a small booth with no problem. For larger rooms, we recommend placing the supply air and return air away from each other to give a more balanced air flow to the room.

Based on advice from the manufacturer, the best plan is to use rigid duct from the duct opening to the Fantech fan and treat that rigid duct with a damping pad like our VibraDamp. If flex duct is used on everything, then the sound will pass right through the duct before reaching the Fantech fan. With the treated rigid duct we can trap the sound in the duct (which will reduce the strength of the vibrations), have it pass through the Fantech FG (which will reduce remaining sound vibrations significantly), and have the remaining sound absorb into flex duct beyond the Fantech FG. The size of the duct used is not crucial to the design, but must be reduced to fit around the opening of the Fantech FG. Check the Product Specs for more information on the sizing for your Fantech FG fan.

The finish of the soffit-type structure is drawn with basic drywall. The finish for your soffit-type structure should match the finish of your exterior wall. To improve further on this design you can build the structure after hanging drywall on the exterior wall.

PERFORMANCE

Because of the Fantech FG's airtight design, and the basic concept of a centrifugal fan, most of the sound vibrations break down within the fan. The installation designs shown on this page force the vibrations passing through the duct work into the Fantech FG. We have created a few assembly designs with the help of Fantech sales reps to maximize the performance of the Fantech FG. Refer to the Installation tab to view these drawings.

PRODUCT SPECS

Fantech FG Centrifugal Fan Specs
Style Diameter Height Duct Diameter Rated Watts
FG 4 8-3/4" 8-1/2" 4" 20 watts
FG 6XL 13-1/8" 8-5/8" 6" 153 watts
Fantech FG Downloads
Fantech FG Product Brochure Download PDF 2.4MB
Fantech FG Installation Download PDF 270KB
Fantech FG Submittal Data Download PDF 420KB

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