Specifications (fire sprinkler heads): 1) Models: a) ZSTP-15: conventional type b) ZSTZ-15: upright type c) ZSTX-15: pendant type d) ZSTB-15: upright sidewall type e) ZSTBS-15: horizontal sidewall type 2) Starting temperatures: 57oC, 68oC, 79oC, 93oC, 141oC 3) Response time index (ms): 0.5≤28, ±8