Vòi phun sprinkler cần một ít thời gian để ống thủy tinh vỡ hoặc mối hàn nóng chảy từ lúc nhiệt độ đạt ngưỡng kích hoạt và tiếp tục tăng lên được gọi là thời gian phản ứng (RTI-Response Time Index), có giá trị từ 35 m1/2s1/2 đến 250 m1/2s1/2. Đầu chữa cháy sprinkler có giá trị RTI nhỏ là loại đầu phản ứng nhanh.

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