Installation and Specifications

Invisco systems come in kit is the ES6400 kit:
1.  Motor and blade (box 1) and your choice of wireless speed control or thermostat speed control. 
2.  8 feet of duct (box 2)
3.  Damper (box 3)
4. There might be a 4th box with the frame and grille and SmartSupport bracket and miscellaneous hardware. 

Below you see the new wireless control. It has an up arrow for higher air flow, a down arrow for lower, and an on off button. When on it saves the speed setting. The receiver to the upper left is in a box on the fan body. The transmitter can be located anywhere in your home.  

latest-attic380-sq  damper-on-ring  10v_dimmer_led_controller

NOTE the damper can be mounted on a wall horizontally

Above is the shell with motor and blade inside and above it the mounting bracket that hangs on the bar held to 2 rafters by lag screws. On the right end of the shell is the 20 inch flex duct. The picture at the right above is the damper on a thin aluminum ring on the top of the ceiling in the attic. 


1. Cut a hole 20-1/4 inch diameter  in the ceiling in a hallway.

2. Put the thin metal ring with 4 rivet nuts on top of the hole.

3. Put the cube core grille inside the hole THIN EDGE DOWN.

4. place the frame under the grille and use the 4 6-32 screws to hold it up and hold the grille in place.

5. Use two lag screws (included) to bolt the 24 inch 1×1 inch tube from one rafter to another at a location close to the hole in the ceiling.

6. Locate an AC outlet in the attic for the AC power plug. If there is none then install an AC power plug.

7. Hang the fan with the SmartSupport on the bar between rafters.

8. Install the 8 feet of 20 inch flex duct between the fan outlet and the damper over the ceiling.


Make a plenum with a plywood sheet so that the damper can sit on top of the plenum and the grille and frame can be in the ceiling.

Cut a plywood sheet 33 inches (to span 3 joists) by 24 inches and cut a hole in the center to match the damper size minus 1 inch. Then place the sheet over 3 joists with one in the center. Cut 4 2x4s or 2x6s (depending on the joist dimension)  to fit between the joists to box in the space.

Then cut a round hole in the ceiling below the joists to hold the cube core grille. In this case you can either hold the grille up with wood screws or cut the metal ring so it fits between the joists and accepts the 6-32 white top screws supplied.

For more information or application assistance, call 800 579 5018 .

7-21-16 Here you see the installation done by Casey in Salt Lake City. 


Central motor and blade shell is 20 inches diameter and 18 inches long.
Damper is 20 diameter and 18 long
Flexible duct is 20 inches diameter and 8 feet long.

Motor is 120 VAC 60 Hz 505 watts max, less than 50 watts at low speed.
Speed is infinitely variable from low RPM up to just under 1200 RPM. 

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