Vesda VSP-991 4mm Microbore Tube UL-compliant Plenum-rated, 500 ft VESDA VSP-991 VEA 4mm Microbore 26T 4MM 500 FT CL RED STRIPE SPOOL LENGTH: 500 Ft VESDA-E VEA microbore tubes are custom-made, high-quality plenum rated flame retardant polyethylene tubes. They have superior stress crack resistance for reliable long-term performance. They are lightweight and flexible for easy handling and installation and marked with a white ink numbering system over the full length of the tubing. The numbering system includes individual unique identification of each tube and distance marking at regular intervals making them very efficient to install and keep clean installation records. These tubes come in black color with red stripes for use in smoke detection and meet requirements of global installation codes. These tubes have no active components, and they eliminate the need for any electrical wiring for smoke detection resulting in fast and easy installation without the need to follow electrical codes. It is important to use VESDA-E VEA microbore tubes with the VESDA-E VEA detectors to maintain their smoke detection performance. These tubes come in two different diameters, 6mm and 4mm. For more information on tube usage, refer to VESDA-E VEA Product Guides (documents: 27034 and 27035) and VEA Microbore Tube Length Calculator (document: 29262). VEA microbore tube fittings comprise of straight unions and other types of joiners and 6mm to 4mm adaptors for easy installations, blanking plugs are used to block the unused ports on VEA. Features: Plenum rated Flame retardant High quality polyethylene material Stress crack resistant Unique ID Distance marking at regular intervals Meets requirements of global installation codes SHELF: 1(top)