Installation Instructions for Rough-In Box
Ceiling Vent Duct Box
This box is intended to be used in ceilings and utilize the Ceiling Vent Grill and Fan Assembly. Generally this box will be installed during the construction and would be connected to the HVAC return vent system by the HVAC contractor on the job.
Determining Placement. This box will simply be placed anywhere in the ceiling of the room or closet that you will be venting.
Installation. Once the placement has been determine, simply screw the unit to the wall or ceiling framing utilizing the drywall flanges. A cross support should be added to support the unit. This way, the box will be fastened to where two of the flanges are screwed to the framing. If additional support is desired, simply frame around the vent as desired.
Once the box is set, ensure the opening is square. It is very common for these boxes to be out of square during their production and handling. Once this is done, have the HVAC contractor connect a 4” (10.2cm) flex duct to the rough-in box. It will be your responsibility to ensure that this is completed because it will ultimately constitute a change order. If by chance this will not be connected to the HVAC system, use the 4x8 rough-in box as an exhaust vent.
Roughing in For Power. When installing the tubing, you can run a power wire through the tubing and into the intake box –just ensure where it enters the tubing is sealed with HVAC tape. This will make for a very clean and easy trim out. Just run the other end of the power wire to the point where you will plug in the power supply. Also note that you can run a standard 2-conductor wire for the power wire and splice on a connector for the fan unit. An alternative to running the wire through the tubing would be to drill a hole in the side of the rough in box but just ensure that the hole is sealed once the wire is run.
Notes. Ensure to follow all code requirements and consult with HVAC or general contractors on your project to ensure that your work will pass inspections. This installation will be new to inspectors and may be scrutinized. All boxes should be completely code compliant but codes do vary greatly from region to region.
Warning: This duct box must be fully covered by insulation to avoid condensation issues if used in an unconditioned environment such as an attic space. Use safety devices and precautions as necessary or as required.