When the fan location falls between joists, a bracket box saves adding blocking. The Arlington FBR425F is a non-metallic vapour box on an adjustable steel bracket, built for double drywall ceilings, with a gasketed flange and a 27.5 cu in body. In Canada it is CSA rated for a 50 lb fan or fixture at joist spacing of 16 to 24 in; its higher UL ratings apply to US installations.
Why electricians pick it
- Adjustable steel bracket spans between joists, so the box lands where the fixture is centred.
- CSA rated 50 lb fan or fixture at 16 to 24 in on centre.
- UL rated 70 lb fan and 90 lb fixture at 24 in on centre, with higher UL figures at 16 in on centre.
- Flange with gasket material forms a barrier against air infiltration; Arlington lists a 2-hour fire rating.
- Includes two NM94 connectors, mud cover, gaskets and captive fan/fixture bracket screws.
Specifications
| Spec |
Detail |
| Brand |
Arlington Industries |
| Model |
FBR425F |
| Type |
Non-metallic vapour box with adjustable steel bracket, double drywall |
| CSA rating (Canada) |
50 lb fan / 50 lb fixture at 16-24 in o.c. |
| UL rating (US), 24 in o.c. |
70 lb fan / 90 lb fixture |
| UL rating (US), 16 in o.c. |
Higher; see current Arlington spec sheet |
| Volume |
27.5 cu in |
| Fire rating |
2-hour (per Arlington) |
| Material |
Plastic box, steel bracket |
| Arlington pack |
5 pcs |
Pro tip from the counter
The UL rating on this bracket box climbs when joists are 16 in on centre instead of 24, but the CSA rating stays at 50 lb across 16 to 24 in spacing. In Canada, tighter joist spacing doesn't let you hang a heavier fan on this box.
Best for: fan locations between joists, double-drywall ceilings, air-tight top-floor ceilings, renovations with open framing
Downloads: Spec sheet (PDF) · Arlington fan/fixture box ratings chart (PDF)
Shipped Canada-wide from our Vaughan, ON counter; contractors can lock in trade pricing with a quote or at (905) 553-7171.