The Viking Corp. has released a 4.2K Residential Horizontal Sidewall Sprinkler, an addition to the Viking Freedom(TM) residential fire sprinkler series. Viking's newest sprinkler offers a 16' x 22' (4,9m x 6,7m) coverage area and features the best overall combination of flows and pressures across all room sizes of any horizontal sidewall. The 4.2K Residential Horizontal Sidewall Sprinkler (VK450) includes UL listing for residential installations below smooth, flat, horizontal ceilings at both 4"