Viking's Model VK481 Quick Response Concealed Horizontal Sidewall Sprinkler VK481 is designed for installation on concealed pipe systems in light and ordinary hazard occupancies (Group 1 and 2). This “flat plate concealed” horizontal sidewall sprinkler is hidden from view by a low profile, small diameter cover plate installed flush with the wall, providing an enhanced aesthetic solution for any area with an ordinary hazard classification. Typical applications include hospitals, casinos, residence halls, automotive showrooms, libraries, mercantile, and exhibition areas. The VK481 cover plate, which is the same cover plate used for the VK480 and VK680 sprinklers, is offered in a standard white finish and is available in temperature ratings of 135°F (57°C) and 165°F (74°C). Additionally, through Viking’s UL Listed custom paint program, Viking can apply virtually any brand and type of paint to the cover plate for a clean, seamless installed appearance.
The cULus Listed, quick response VK481 can be installed with the deflector between 4 and 12 in (102-305 mm) below the ceiling to better accommodate potential installation obstructions, such as light fixtures and crown moldings. With a total length of only 2 in (51 mm), the sprinkler’s compact design also allows for easier installation in tight wall spaces.
The 5.6 (81) K-factor VK481 has a ½ in (15 mm) NPT thread size and is available in 165°F (74°C) and 220°F (104°C) temperature ratings.
Note: Some sprinkler head may or may not have Teflon tape applied. The heads have never been installed.