L-shaped fan and fixture vapor box. 70lb fan, 200lb fixture rated for double drywall. 28.5 cu. 2 Hour Fire Rating. Flange forms a protective barrier against air infiltration.

L-shaped Fan and Fixture Vapor Box – Vapor Barrier for Electrical Installations The Arlington L-shaped fan and fixture vapor box is designed for secure mounting to joists in new construction, providing a reliable vapor barrier to prevent air infiltration through ceilings or building envelopes. Suitable for use with double drywall installations, this vapor box supports fans up to 70 lbs and fixtures up to 200 lbs, meeting UL and CSA ratings. The box features an integrated flange with gasket material to maintain energy efficiency and comply with residential codes where required. Ideal for electrical distributors and lighting solutions providers, it facilitates fast, secure installation with captive fan/fixture bracket screws and installed NM cable connectors. Specifications Material: Plastic Color: Black UL Ratings: 70 lb fan, 200 lb fixture CSA Rating: 50 lb fan or fixture Fire Rating: 2 Hour Cubic Inches: 28.5 Mounting: Joist mount with shipped-in-place center screw Product Weight: 0.4320 lbs Manufacturer: Arlington Industries Manufacturer Part Number: FB443FD Features Economical L-shaped design for fan and fixture installations Flange with gasket material forms a protective barrier against air infiltration Installed NM cable connectors with gasket material included Captive fan/fixture bracket installation screws for secure mounting Compatible with double drywall ceilings Non-metallic and non-conductive construction Meets ENERGY STAR requirements for continuous insulation applications Downloads & Links Specification Sheet Catalog Page FB443FD Line Drawing