Ceiling – How to insulate around a celing heater

ceilingheaterinsulation

I just installed a heater in the ceiling of my bathroom and am trying to decide how to insulate around it. The insulation in my attic is the fluffy, blown insulation (cellulose maybe? not exactly sure what it's called).

It seems like it might be a fire hazard to put it right up against the heater. If it is, how far away does it need to be away? Do I need to get some fiberglass to use here?

Best Answer

The manual and device specifications—oddly—do not use any of the words which mean the appliance is zero clearance. Though it is meant to be installed through sheetrock or other fire dampening materials. It is an odd situation.

There have been several fires reported caused by the Nutone 559R:

Presumably, thousands and thousands of these units are in use daily, so the few incidents reported actually seem to indicate a really good safety record. Note that one of the six reports was from a modified unit which bypassed the thermal protection.

Given the possibilities, I would—if reasonably simple:

  • Install with metallic brackets so that no wood touches the box.
  • Keep all flammables away from the box exterior.
  • Don't worry about insulating around it.