Instructions / Assembly

2
Ventamatic, Ltd. | 100 Washington Ave, Mineral Wells, TX 76068 ▪ Phone: [phone] ▪ www.bvc.com
INSTALLATION INSTRUCTIONS
VERY IMPORTANT
Please read before attempting installation
The fan and shutter are designed for horizontal installation only—the louvers will not function in the vertical
position.
The wooden fan frame is installed on top of the joists, and the shutters open up between the joists, so the rough
opening will be smaller than the fan frame size.
Fan Size
Shutter Rough Opening (L X W)
24-in.
28” X 26”
30-in.
32 1/4” X 29 1/2”
36-in.
34” X 37 1/2”
Veins run lengthwise in 24-in and 30-in shutters, and width-wise in 36-in shutters
Center vein is stationary to allow no-cut joist installation
*For model CX36BD2SPD – The joist-in method may be used only if the joists are 24” on center, or greater, and if there is enough
space between the involved joists and any walls.
24-in Fans- Requires attic space of at least 1200 sq ft. and 8-10 sq ft. of Net Free Exhaust Area
30-in Fans- Requires attic space of at least 1800 sq ft. and 10-12 sq ft. of Net Free Exhaust Area
36-in Fans- Requires attic space of at least 3000 sq ft. and 14 sq ft. of Net Free Exhaust Area
*When measuring vents for NFA, remember that louvers and screens cut down considerably on the available free air — this can
be factored in by measuring the length by the width of the open vent area and dividing the resulting surface size in half.
DO NOT OVERSIZE YOUR FAN! Additional installation of exterior vents may be required to
provide sufficient Net Free Exhaust Area (NFA) for your fan to operate safely and effectively.
Remember – bigger is not always better with Whole House Fans. A smaller fan that operates
efficiently will always be preferable to a fan that is too big for its application.
Tools and Materials Needed:
 Drill
 1/4” and 1/8” drill bits
 Straight edge ruler (yardstick, 4 ft.
level)
 Pencil or marker
 Circular saw
 Ring shank drywall nails (1 1/2")
 #12D nails
 Adjustable wrench
 Flat head screwdriver
 Phillips head screwdriver
 Safety goggles
 Speed square
 Saber saw, reciprocating saw