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 damper assembly box is designed for horizontal installation only—the dampers will not function in the
vertical position.
The damper assembly box is designed to fit in between 16 inch on center or 24 inch on center ceiling joists.
The damper assembly box requires a rough opening to be cut that is 14-½” x 22-½”.
CX1401- Adequate for 533 sq. ft. house. Requires a minimum of 310 sq. in. of Net Free Exhaust Area
CX1801- Adequate for 930 sq. ft. house. Requires a minimum of 535 sq. in. 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 Needed
Materials Needed
 Drill
 Small drill bit (3/32" recommended)
 Gloves
 Eye protection
 12 foot tape measure or longer
 Pencil or marker
 Circular saw for cutting lumber
 Drill bit for driving screws
 Hammer
 24" long straight edge or construction level
 Keyhole or saber saw
 3/8" drill bit
 Wrenches for hex head bolts and nuts
 Phillips screwdriver
 Slotted screwdriver
 Needle-nose pliers
 36 inch length of wire for location marking
(unfolded coat hanger works well)
 2x4 or larger lumber for framing
 3-1/2" wood screws or nails
 2" wood or drywall screws