Wanlin Fire - China source manufacturer for fire alarm lead time. Featured model WL-TH-HD (Fixed & Rate-of-Rise Heat Detector): Rate-of-rise A1R: 57 deg C fixed + 8 deg C/min rise; EN54-5 Class A1R, fixed 57 deg C + rate-of-rise 8 deg C/min; Panel zone alarm + optional internal 87 dB sounder; -10 to +50 deg C, 0-95% RH (tropical humidity rated). Full lineup:···