Broan 784 Install The Housing, Install The Ductwork, New Construction, Existing Construction

INSTALL THE HOUSING

- PLEASE NOTE -

THE FOLLOWING INSTALLATION ILLUSTRATIONS SHOW 2 X 6 JOISTS. IFYOU HAVE A TRUSS OR “I”-JOIST INSTAL- LATION, MOUNT THE VENTILATOR TO THE ADDITIONAL FRAMING IN THE SAME MANNER. (Additional framing must be a 2x6 (minimum height), at least 9-inches long.)

NEW CONSTRUCTION

MODEL 784

Page 3

EXISTING CONSTRUCTION

1. Choose the location for your fan in the ceiling. For best possibleperformance, use the shortest possible duct run and a minimum number of elbows.

2. In attic, position mounting brackets against joist. Trace

1.Choose the location for your fan in the ceil- ing. For best possible performance, use the shortest possible duct run and a minimum number of elbows.

2.Position mounting brackets against joist so that bottom edge of housing will be flush with finished ceiling.

HOLES

TAB

1-1/4

1

5/8

BOTTOM EDGE OF JOIST

outline of housing on ceiling material.

3.Set housing aside and cut ceiling opening slightly larger than marked.

Additional positioning feature for 5/8”, 1”, & 1-1/4” thick ceiling material: Holes in corners of housing are labeled with various ceiling material thicknesses. Position housing so bottom edge of joist is visible through a matched set of holes. The housing is now in the proper position for that ceiling material thickness.

Additional positioning feature for 1/2” thick ceiling material: Bend two tabs, on side of housing, 90° outward. Lift housing until tabs contact underside of joist. Mark the keyhole slot on both mounting brackets.

3.Set housing aside and drive nails partially into joist at the top of both keyhole marks.

4. Hang housing from nails and pound nails tight. To ensure a noise-free mount, pound another nail through the top hole of each mounting tab.

4. Place housing in opening so that its bottom edge is flush with finished ceiling. Nail to joist through keyhole on both sides.

To ensure a noise-free installation, drive another nail through the top hole of each mounting bracket.

5. Additional mounting holes
are provided for installations
where access from above is
inconvenient or not possible.
Nail or screw housing
directly to joists or framing.	ADDITIONAL MOUNTING
	HOLES

INSTALL THE DUCTWORK

FLUSH

1.Snap the damper/duct connector onto housing. Make sure that tabs on the connector lock into slots in housing. Top of damper/duct connector should be flush with top of housing.

2.Connect 4” round duct to damper/duct connector and extend duct to outside through a roof or wall cap. Check damper to make sure that it opens freely. Tape all duct connections to make them secure and air tight.