Ceiling fans under a vented attic need a box that carries the load and keeps the air barrier intact. The Arlington FB443FD is an L-shaped, joist-mount ONE-BOX™ vapour box for fans and fixtures, sized for double drywall ceilings, with a gasketed flange and a 28.5 cu in body. Arlington publishes two sets of load ratings for it, and in Canada the CSA rating of 50 lb for a fan or fixture is the one to design to.
Why electricians pick it
- CSA rated 50 lb fan or fixture; UL rated 70 lb fan and 200 lb fixture (US listing).
- L-shaped body side-mounts to a wood or steel joist with a shipped-in-place centre screw.
- Flange with installed gasket forms a barrier against air infiltration.
- Arlington lists a 2-hour fire rating.
- Includes three NM94 connectors, a mud cover, knockout gaskets and captive fan bracket screws.
Specifications
| Spec |
Detail |
| Brand |
Arlington Industries |
| Model |
FB443FD |
| Type |
L-shaped joist-mount vapour box for fans and fixtures, double drywall |
| CSA rating (Canada) |
50 lb fan / 50 lb fixture |
| UL rating (US) |
70 lb fan / 200 lb fixture |
| Volume |
28.5 cu in |
| Fire rating |
2-hour (per Arlington) |
| Size (H x W) |
6.25 x 6.25 in |
| Material |
Plastic, black |
| Arlington pack |
25 pcs |
Pro tip from the counter
The 70/200 lb numbers on US distributor sites are the UL listing. For a Canadian inspection the box is CSA rated 50 lb for a fan or fixture, so check the fan or chandelier weight on its carton before you commit, and pick a different support for anything heavier.
Best for: ceiling fans under attics, double-drywall ceilings, air-tight new construction, fire-rated ceiling assemblies
Downloads: Spec sheet (PDF) · Arlington fan/fixture box ratings chart (PDF)
Ships from Vaughan, ON to job sites across Canada. Contractors: request a quote for trade pricing, or call (905) 553-7171.